CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) DIAGNOSIS SYSTEM


  1. CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION


    1. The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

      Connected to Code ECU/Sensor Name GTS Display Applicability
      - CGW Central gateway ECU (network gateway ECU)

      • CAN Gateway1

      • CAN Gateway2

      		 Installed on all vehicles
      V bus DLC3 DLC3 - Installed on all vehicles
      Bus 2 MET Combination meter assembly Combination Meter Installed on all vehicles
      SMT Certification ECU (smart key ECU assembly) Certification (Smart) Vehicles with Entry and Start System
      STR Steering sensor (spiral cable with sensor sub-assembly) Spiral cable (Steering Angle Sensor) Installed on all vehicles
      SRS Airbag sensor assembly Airbag Installed on all vehicles
      EPS Power steering ECU with motor assembly Power Steering (EPS) Installed on all vehicles
      A/C Air conditioning amplifier assembly Air Conditioning Amplifier Vehicles with Air Conditioning System
      CS Clearance warning ECU assembly Clearance Warning (Clearance Sonar) Vehicles with Simple Intelligent Parking Assist System
      S&S Engine stop and start ECU Stop and Go/Start Vehicles with Stop and Start System
      BRK Brake actuator assembly Skid Control (ABS/VSC/TRAC) Installed on all vehicles
      MB Main body ECU (multiplex network body ECU) Main Body Installed on all vehicles
      LIT Headlight leveling ECU assembly Headlight swivel (AFS) Vehicles with Automatic Headlight Beam Level Control System
      ENG ECM ECM (Engine) Vehicles for 1NR-FE or 1ND-TV
      ECM

      • ECM (Engine)

      • VALVEMATIC Driver*1

      • Power Management*2

      		 Vehicles for 1ZR-FAE
      Bus 3 AV Radio and display receiver assembly Display and Navigation (AVN) Vehicles for Radio and Display Type
      Bus 5 F-CAM Pre-crash safety city sensor Front Camera Module Installed on all vehicles

      Tech Tips


      • The names of ECUs and sensors shown on the GTS display may differ from those shown in the DTC Table by ECU section.

      • *1: If "ECM (Engine)" is displayed but "VALVEMATIC Driver" is not displayed, a local CAN communication error between the ECM and continuously variable valve lift controller assembly is suspected. (Output DTC: U011B)

      • *2: If "ECM (Engine)" is displayed but "Power Management" is not displayed, a local CAN communication error between the ECM and generator control ECU assembly is suspected.

      • The generator control ECU assembly is displayed as "Power Management" when a CAN bus check is performed.

  2. CAN BUS CHECK

    Tech Tips

    The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the GTS.


    1. Using the GTS, select the CAN Bus Check screen.


      CAN Bus Check

      Note


      • It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu. This is not a malfunction. (This occurs when optional devices are not on a sub bus that is monitored by a gateway function equipped ECU.)

      • In the bus selection pull down menu, all buses applicable to the model are displayed (e.g. LIN communication buses are also displayed). Therefore, refer to the wiring diagrams to check the names of sub buses for CAN communication.

        Click here

      Tech Tips

      Different connection statuses are indicated by the background color of ECUs and sensors that are displayed.

      Explanation of CAN Bus Check Screen
      Bus Type Background Color Connection Status
      Bus 2 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that does not have history of connected ECUs)*2

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that has history of connected ECUs)*3

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red

      Currently not communicating (either of the following):


      • Communication stop has continued since the start of the CAN bus check.

      • Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring.
      Not displayed

      Either of the following:


      • If a gateway function equipped ECU cannot communicate, the non-bus 2 and ECUs connected to the non-bus 2 will not be displayed.

      • If no ECUs are connected to the non-bus 2, "There is no system found on the Communication Bus" will be displayed.

      Tech Tips


      • Gateway function equipped ECUs relay signals between the ECUs connected to the different buses.

      • *1: ECUs that are present in the vehicle but are not displayed on the CAN Bus Check screen.

      • *2: Gateway function equipped ECU that does not memorize the non-bus 2 ECUs that are connected to it.

      • *3: Gateway function equipped ECU that memorizes the non-bus 2 ECUs that are connected to it.

      • If none of the connected ECUs are displayed, or there is no response from the vehicle to the GTS, check the central gateway ECU (network gateway ECU) and the V bus branch lines for a malfunction.

    2. Observe the connection response screen for approximately 2 minutes to check for a change in connection status of the connected ECUs and sensors.

      Tech Tips


      • If an open occurs in one of the lines of a CAN branch (except DLC3), output from the other branch line (the line that is not open) will be unstable and it may interfere with the response (display) of other ECUs and sensors.

      • If the connection status changes during the inspection, repair the open in the branch line of the ECU or sensor that does not respond (is not detected) and then perform the CAN bus check again.

  3. HOW TO INTERPRET CAN BUS CHECK SCREEN


    1. When a communication stop is currently occurring, the probable malfunctioning part can be determined from the CAN bus check and by using the following methods.

      Note

      The following CAN bus wiring diagram is provided only as an example. This wiring diagram is different from the actual wiring diagram for this vehicle.

      Tech Tips


      • When a communication stop is currently occurring, it is easier to determine the probable malfunctioning part from the CAN bus check rather than from communication DTCs.

      • Wait for approximately 2 minutes after turning the ignition switch on (IG) (or simulate the driving conditions that enable the malfunction to be reproduced) and select "CAN Bus Check". Then observe the communication status of each ECU on the screen.

    2. If a communication error of only 1 ECU or sensor is indicated on the CAN Bus Check screen, a communication stop of the ECU or sensor is suspected.

      Open in both CAN branch lines of ECU D on the bus 2

      A01TAHYC05
      *a Bus 2 *b Non-bus 2
      *c V Bus *d Terminating Resistor
      *e Location of Malfunction *f Not displayed or background color changes to red or yellow
      *g CAN Bus Check Screen *h Central Gateway ECU (Network Gateway ECU)

      Tech Tips

      When there are communication stops, ECUs that are present in the vehicle may not be displayed on the CAN Bus Check screen.

    3. A01TAEUC04
      *a Background color periodically changes to yellow or red
      *b Not displayed or background color is yellow or red
      *c Not displayed

      If communication errors for multiple ECUs or sensors are indicated on the CAN Bus Check screen, then a communication stop of the ECU or sensor that shows a more serious communication stop (an ECU or sensor which is not displayed) is suspected.

      Example: Open in a CAN branch line for ECU B on the bus 2

      Explanation of CAN Bus Check Screen
      Bus Type Background Color Connection Status
      Bus 2 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that does not have history of connected ECUs)*2

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that has history of connected ECUs)*3

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red

      Currently not communicating (either of the following):


      • Communication stop has continued since the start of the CAN bus check.

      • Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring.
      Not displayed

      Either of the following:


      • If a gateway function equipped ECU cannot communicate, the non-bus 2 and ECUs connected to the non-bus 2 will not be displayed.

      • If no ECUs are connected to the non-bus 2, "There is no system found on the Communication Bus" will be displayed.

      Tech Tips


      • Gateway function equipped ECUs relay signals between the ECUs connected to the different buses.

      • *1: ECUs that are present in the vehicle but are not displayed on the CAN Bus Check screen.

      • *2: Gateway function equipped ECU that does not memorize the non-bus 2 ECUs that are connected to it.

      • *3: Gateway function equipped ECU that memorizes the non-bus 2 ECUs that are connected to it.

      • The example of the CAN Bus Check screen in the illustration shows the result of electrical noise on the CAN bus which is caused by an open in a CAN branch line of ECU B (output from the other branch line is unstable) and the communication of ECU A is also unstable. In addition, in this example, ECU A is equipped with a gateway function. Therefore, communication is also unstable between the non-bus 2 ECUs of ECU A and the bus 2.

      • The example in the illustration shows that ECU B is not displayed on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of ECU B is suspected.

    4. A01T90HC04
      *a Not displayed or background color changes to red

      If a communication error is indicated on both the bus 2 and non-bus 2 on the CAN Bus Check screen, suspect any communication stop displayed for the bus 2 first.

      Example: Open in both CAN branch lines of ECU A on the bus 2

      Tech Tips


      • In the CAN bus check, it is possible to confirm the communication status of ECUs connected to the bus 2 after connecting the GTS to the DLC3. As for non-bus 2, it is possible to confirm which non-bus 2 connected ECUs can communicate with a gateway function equipped ECU on the bus 2.

      • If a gateway function equipped ECU has a communication error, ECUs connected to the gateway function equipped ECU are also affected, and communication stops will be indicated.

      • The CAN Bus Check screen in the illustration shows that ECU A has a gateway function and a communication stop in ECU A is suspected.

    5. A01TD99C04
      *a Background color changes to red

      If the CAN Bus Check screen indicates a communication stop only in the non-bus 2, a communication stop in the non-bus 2 is suspected.

      Example: Open in both CAN branch lines of ECU G on the non-bus 2

      Tech Tips


      • A communication error in a non-bus 2 does not affect the bus 2 or other buses.

      • When a gateway function equipped ECU has memorized the ECUs that are connected to the non-bus 2, if any of the ECUs connected to the gateway function equipped ECU has a communication error, the background color changes to yellow or red. (The displayed name will not disappear.)

    6. If both of the bus 2 main bus lines are open, ECUs or sensors that are located farther away from the central gateway ECU (network gateway ECU) than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, ECU D and E are not displayed or their background color changes to red.)

      A01TA2YC04
      *a Bus 2 *b Non-bus 2
      *c V Bus *d Terminating Resistor
      *e Location of Malfunction *f Not displayed or background color is red
      *g CAN Bus Check Screen *h Central Gateway ECU (Network Gateway ECU)

      Tech Tips

      If a communication error occurs in an ECU, it is not displayed on the CAN Bus Check screen even though the ECU is present.

    7. If both of the non-bus 2 main bus lines are open, ECUs that are located farther away from the central gateway ECU (network gateway ECU) than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, ECU I and J are not displayed or their background color changes to red.)

      A01T9TJC04
      *a Bus 2 *b Non-bus 2
      *c V Bus *d Terminating Resistor
      *e Location of Malfunction *f Not displayed or background color is red
      *g CAN Bus Check Screen *h Central Gateway ECU (Network Gateway ECU)
    8. A01TBYOC04
      *a When any of the following malfunctions occur on the bus 2
      *b When any of the following malfunctions occur on a non-bus 2
      *c Not displayed

      When any of the following malfunctions occur, CAN communication cannot be established and almost all ECUs and sensors on the bus show a communication error on the CAN Bus Check screen.

      Details of Malfunction
      Short between CAN lines (CANH and CANL)
      Short between a CAN line (CANH or CANL) and +B
      Short between a CAN line (CANH or CANL) and ground
      Open in a CAN main bus line

      Tech Tips


      • When a malfunction occurs in the bus 2, almost all ECUs and sensors on the bus 2 and non-bus 2 indicate a communication error (almost all ECUs are not displayed). As communication with the gateway function equipped ECU that is connected to the bus 2 stops, communication from the ECUs connected to the non-bus 2 that is monitored by the gateway function equipped ECU also stops (these ECUs are not displayed).

      • When a malfunction occurs in a non-bus 2, almost all ECUs connected to the non-bus 2 indicate a communication error.

      • A communication error in a non-bus 2 does not affect the bus 2 or other buses.

      • The malfunctioning part can be determined by checking for a short circuit between CAN bus lines or between a CAN bus line and ground or +B short using an electrical tester.

  4. DTC TABLE BY ECU

    Tech Tips


    • In the CAN communication system, the CAN communication DTCs of each ECU can be displayed using the GTS.

    • If CAN communication system DTCs are output, the malfunction cannot be determined only by the DTCs. Perform troubleshooting according to How to Proceed with Troubleshooting.

      Click here

    • If the system function temporarily returns to normal, DTCs may not be output again even if the following DTC check procedures are used.


    1. ECM (for 1ND-TV) / GTS Display "Engine and ECT"


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: w/ Stop and Start System

      ECM (for 1ND-TV) / GTS Display "Engine and ECT"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0129 Lost Communication with Skid Control ECU The ECM does not receive data from the brake actuator assembly for 2.4 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 2.1 seconds or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 4.5 seconds. MIL illuminates. DTC is stored until it is cleared using the GTS.
      U1103* Lost Communication with Stop and Start Control Module The ECM does not receive data from the engine stop and start ECU for 1.25 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 2.25 seconds. - DTC is stored until it is cleared using the GTS.

    2. ECM (for 1ZR-FAE) / GTS Display "Engine and ECT"


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: This DTC is stored due to a local CAN communication error between the ECM and continuously variable lift controller assembly.

      ECM (for 1ZR-FAE) / GTS Display "Engine and ECT"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0129 Lost Communication with Brake System Control Module The ECM does not receive data from the brake actuator assembly for 2.34 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 12.34 seconds. MIL illuminates. DTC is stored until it is cleared using the GTS.
      U011B* Lost Communication with Rocker Arm Control Module "A" The ECM does not receive data from the continuously variable valve lift controller assembly for 0.2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 0.05 seconds or more.

      • The power source voltage of the ECM is 8 V or more.

      		 Turn the ignition switch to ON and wait at least 1 second. MIL illuminates. DTC is stored until it is cleared using the GTS.

    3. ECM (for 1NR-FE) / GTS Display "Engine and ECT"

      Tech Tips

      The ECM is connected to the CAN communication system, but the ECM does not store or output CAN communication DTCs.

    4. Brake Actuator Assembly / GTS Display "ABS/VSC/TRC"


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Brake Actuator Assembly / GTS Display "ABS/VSC/TRC"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Control Module Communication Bus OFF Bus off is judged for 0.1 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the brake actuator assembly is between 9.6 and 16.5 V.

      		 Turn the ignition switch to ON and check that the initial light check illumination turns off, and then wait at least 3 seconds.

      • ABS warning light illuminates.

      • Brake warning light illuminates.

      • Slip warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM The brake actuator assembly does not receive data from the ECM for 2.5 seconds or more.

      All conditions are met:


      • Vehicle speed is 6 km/h (4 mph) or more.

      • The ignition switch is ON for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the brake actuator assembly is between 9.6 and 16.5 V.

      		 Turn the ignition switch to ON and drive the vehicle at a speed of 6 km/h (4 mph) or more for 6 seconds or more. Check that the warning light remains off after turning off following the initial light check. Slip warning light illuminates. DTC is stored until it is cleared using the GTS.
      U0123 Lost Communication with Yaw Rate Sensor Module The brake actuator assembly does not receive data from the airbag sensor assembly for 1.1 seconds or more.

      All conditions are met:


      • Vehicle speed is 6 km/h (4 mph) or more.

      • The ignition switch is ON for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the brake actuator assembly is between 9.6 and 16.5 V.

      		 Turn the ignition switch to ON and drive the vehicle at a speed of 6 km/h (4 mph) or more for 3 seconds or more. Check that the warning light remains off after turning off following the initial light check. Slip warning light illuminates. DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The brake actuator assembly does not receive data from the steering sensor (spiral cable with sensor sub-assembly) for 1.1 seconds or more.

      All conditions are met:


      • Vehicle speed is 6 km/h (4 mph) or more.

      • The ignition switch is ON for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the brake actuator assembly is between 9.6 and 16.5 V.

      		 Turn the ignition switch to ON and drive the vehicle at a speed of 6 km/h (4 mph) or more for 3 seconds or more. Check that the warning light remains off after turning off following the initial light check. Slip warning light illuminates. DTC is stored until it is cleared using the GTS.

    5. Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"


      Body Electrical > Main Body > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: w/ Entry and Start System

      Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication With ECM/PCM "A" The main body ECU (multiplex network body ECU) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with ECT The main body ECU (multiplex network body ECU) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0120* Lost Communication With Starter / Generator Control Module The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Airbag ECU The main body ECU (multiplex network body ECU) does not receive data from the airbag sensor assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The main body ECU (multiplex network body ECU) does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0164 Communication Error from A/C The main body ECU (multiplex network body ECU) does not receive data from the air conditioning amplifier assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U023A Lost Communication with Front Camera Module The main body ECU (multiplex network body ECU) does not receive data from the pre-crash safety city sensor for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0327* Software Incompatibility with Vehicle Security Control Module The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.

    6. Combination Meter Assembly / GTS Display "Combination Meter"


      Body Electrical > Combination Meter > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Combination Meter Assembly / GTS Display "Combination Meter"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The combination meter assembly does not receive data from the ECM for 2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the combination meter assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 2 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Skid Control ECU The combination meter assembly does not receive data from the brake actuator assembly for 3 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the combination meter assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 3 seconds. - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The combination meter assembly does not receive data from the power steering ECU with motor assembly for 3 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the combination meter assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 3 seconds. EPS warning light illuminates. DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Airbag ECU The combination meter assembly does not receive data from the airbag sensor assembly for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the combination meter assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 10 seconds. SRS warning light illuminates. DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication With Navigation Control Module The combination meter assembly does not receive data from the radio and display receiver assembly for 3 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the combination meter assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 3 seconds. - DTC is stored until it is cleared using the GTS.
      U023A Lost Communication with Front Camera Module The combination meter assembly does not receive data from the pre-crash safety city sensor for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the combination meter assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.

    7. Air Conditioning Amplifier Assembly (w/ Air Conditioning System) / GTS Display "Air Conditioner"


      Body Electrical > Air Conditioner > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Air Conditioning Amplifier Assembly (w/ Air Conditioning System) / GTS Display "Air Conditioner"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM The air conditioning amplifier assembly does not receive data from the ECM for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Electric Power Steering ECU The air conditioning amplifier assembly does not receive data from the power steering ECU with motor assembly for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Main Body ECU The air conditioning amplifier assembly does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The air conditioning amplifier assembly does not receive data from the combination meter assembly for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.

    8. Power Steering ECU with Motor Assembly / GTS Display "EMPS"


      Chassis > EMPS > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Power Steering ECU with Motor Assembly / GTS Display "EMPS"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The power steering ECU with motor assembly does not receive data from the ECM for 300 seconds or more.

      All conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the power steering ECU with motor assembly is 9 V or more.

      • Vehicle speed is 20 km/h (12 mph) or more.

      		 Drive the vehicle for 303 seconds at a speed of 20 km/h (12 mph) or more. EPS warning light illuminates. DTC remains stored only while malfunction is occurring.
      U0129 Lost Communication with Brake System Control Module The power steering ECU with motor assembly does not receive data from the brake actuator assembly for 2.34 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the power steering ECU with motor assembly is 9 V or more.

      		 Turn the ignition switch to ON and wait at least 5.34 seconds. EPS warning light illuminates. DTC remains stored only while malfunction is occurring.
      U1110 Lost Communication with Clearance Sonar Module The power steering ECU with motor assembly does not receive data from the clearance warning ECU assembly for 1.34 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the power steering ECU with motor assembly is 9 V or more.

      		 Turn the ignition switch to ON and wait at least 4.34 seconds. - DTC remains stored only while malfunction is occurring.

    9. Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System) / GTS Display "Entry&Start"


      Body Electrical > Entry&Start > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: w/ Stop and Start System

      Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System) / GTS Display "Entry&Start"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM The certification ECU (smart key ECU assembly) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Main Body ECU The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U1103* Lost Communication with Stop and Start Control Module The certification ECU (smart key ECU assembly) does not receive data from the engine stop and start ECU for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.

    10. Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System) / GTS Display "Power Source Control"


      Body Electrical > Power Source Control > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: w/ Stop and Start System

      Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System) / GTS Display "Power Source Control"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM / PCM The certification ECU (smart key ECU assembly) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Main Body ECU The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U1103* Lost Communication with Stop and Start Control Module The certification ECU (smart key ECU assembly) does not receive data from the engine stop and start ECU for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 10 seconds or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.

    11. Radio and Display Receiver Assembly (for Radio and Display Type) / GTS Display "Navigation System"


      Body Electrical > Navigation System > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Radio and Display Receiver Assembly (for Radio and Display Type) / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The radio and display receiver assembly does not send/receive data 10 times in succession.

      Both conditions are met:


      • The ignition switch is ACC for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the ignition switch to ACC and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0100 Engine ECU Communication The radio and display receiver assembly does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 VSC (ECB) ECU Communication The radio and display receiver assembly does not receive data from the brake actuator assembly for 1 second or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 2 seconds. - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The radio and display receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 4 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Meter ECU Communication The radio and display receiver assembly does not receive data from the combination meter assembly for 30 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 31 seconds. - DTC is stored until it is cleared using the GTS.
      U0164 Air Conditioner ECU Communication The radio and display receiver assembly does not receive data from the air conditioning amplifier assembly for 15 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 15 seconds. - DTC is stored until it is cleared using the GTS.

    12. Clearance Warning ECU Assembly (w/ Simple Intelligent Parking Assist System) / GTS Display "Clearance Sonar / Simple-IPA."


      Body Electrical > Clearance Sonar/Simple-IPA > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to Simple Intelligent Parking Assist System

        Click here

      • *2: w/ Stop and Start System

      Clearance Warning ECU Assembly (w/ Simple Intelligent Parking Assist System) / GTS Display "Clearance Sonar / Simple-IPA."
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Control Module Communication Bus "A" Off The clearance warning ECU assembly detect bus-off or register freeze.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 10.05 seconds. - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM "A" The clearance warning ECU assembly does not receive data from the ECM for 3.5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 8.5 seconds. - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The clearance warning ECU assembly does not receive data from the TCM for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The clearance warning ECU assembly does not receive data from the steering sensor (spiral cable with sensor sub-assembly) for 11.2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 16.2 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The clearance warning ECU assembly does not receive data from the brake actuator assembly for 5.1 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 10.1 seconds. - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The clearance warning ECU assembly does not receive data from the power steering ECU with motor assembly for 1.4 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 6.4 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The clearance warning ECU assembly does not receive data from the main body ECU (multiplex network body ECU) for 11 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 16 seconds. - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Restraints Control Module The clearance warning ECU assembly does not receive data from the airbag sensor assembly for 1.2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 6.2 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The clearance warning ECU assembly does not receive data from the combination meter assembly for 11 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 16 seconds. - DTC is stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The clearance warning ECU assembly does not receive data from the air conditioning amplifier assembly for 11 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 16 seconds. - DTC is stored until it is cleared using the GTS.
      U0301*1 Software Incompatibility with ECM/PCM Storage information on the clearance warning ECU assembly and data sent from ECM/PCM is different.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 6 seconds. - DTC is stored until ECU information becomes the same as send data from ECM/PCM.
      U0322*1 Software Incompatibility with Body Control Module Storage information on the clearance warning ECU assembly and data sent from body control module is different.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 8 seconds. - DTC is stored until ECU information becomes the same as send data from main body ECU (multiplex network body ECU).
      U1103*2 Lost Communication with Stop and Start Control Module The clearance warning ECU assembly does not receive data from the engine stop and start ECU assembly for 1.2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 V or more.

      		 Turn the ignition switch to ON and wait at least 6.2 seconds. - DTC is stored until it is cleared using the GTS.

    13. Headlight Leveling ECU Assembly (w/ Automatic Headlight Beam Level Control System) / GTS Display "HL AutoLeveling"


      Body Electrical > HL AutoLeveling > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Automatic Headlight Beam Level Control System

        Click here

      Headlight Leveling ECU Assembly (w/ Automatic Headlight Beam Level Control System) / GTS Display "HL AutoLeveling"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A" The headlight leveling ECU assembly does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the headlight leveling ECU assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The headlight leveling ECU assembly does not receive data from the brake actuator assembly for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the headlight leveling ECU assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The headlight leveling ECU assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the headlight leveling ECU assembly is 9.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U1000* CAN Communication Failure(Message Registry) The headlight leveling ECU assembly does not send/receive data 10 times in succession.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the headlight leveling ECU assembly is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 13 seconds. - DTC is stored until it is cleared using the GTS.

    14. Engine Stop and Start ECU (w/ Stop and Start System) / GTS Display "Stop and Start"


      Powertrain > Stop and Start > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: w/ Simple Intelligent Parking Assist System

      Engine Stop and Start ECU (w/ Stop and Start System) / GTS Display "Stop and Start"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The engine stop and start ECU does not receive data from the ECM for 0.76 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 1.76 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0121 Lost Communication with Anti-Lock Brake System (ABS) Control Module The engine stop and start ECU does not receive data from the brake actuator assembly for 2.22 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 2.1 seconds or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 4.32 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The engine stop and start ECU does not receive data from the steering sensor (spiral cable with sensor sub-assembly) for 0.72 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 1.72 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The engine stop and start ECU does not receive data from the power steering ECU with motor assembly for 0.8 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 1.8 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with J/B ECU The engine stop and start ECU does not receive data from the main body ECU (multiplex network body ECU) for 3.6 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 4.6 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with SRS Airbag ECU The engine stop and start ECU does not receive data from the airbag sensor assembly for 10.6 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11.6 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) The engine stop and start ECU does not receive data from the combination meter assembly for 10.6 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11.6 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The engine stop and start ECU does not receive data from the air conditioning amplifier assembly for 10.6 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 11.6 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.
      U1110* Lost Communication with Clearance Sonar Module The engine stop and start ECU does not receive data from the clearance warning ECU assembly for 0.85 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the ignition switch to ON and wait at least 1.85 seconds. Stop and start cancel indicator light flashes. DTC is stored until it is cleared using the GTS.

    15. Pre-crash Safety City Sensor / GTS Display "PCS/LDA/RSA/LVN"


      Chassis > PCS/LDA/RSA/LVN > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • When the pre-crash safety city sensor is extremely hot or cold, a communication error may occur and DTC U023A may be stored. Communication will return to normal when the temperature of the pre-crash safety city sensor returns to normal.

      • The pre-crash safety city sensor incorporates the pre-crash safety system, lane departure alert system, automatic high beam system and road sign assist system.

      • *: Only when the lane departure alert system is operating.

      Pre-crash Safety City Sensor / GTS Display "PCS/LDA/RSA/LVN"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The pre-crash safety city sensor does not receive data from the ECM for 3.072 seconds or more.

      All conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the pre-crash safety city sensor is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 6.072 seconds or more.

      • PCS OFF warning light flashes.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator light does not illuminate.*

      • Master warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0123 Lost Communication with Yaw Rate Sensor Module The pre-crash safety city sensor does not receive data from the airbag sensor assembly for 1 second or more.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the pre-crash safety city sensor is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 4 seconds.

      • PCS OFF warning light flashes.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator light does not illuminate.*

      • Master warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The pre-crash safety city sensor does not receive data from the steering sensor (spiral cable with sensor sub-assembly) for 1 second or more.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the pre-crash safety city sensor is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 4 seconds.

      • PCS OFF warning light flashes.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator light does not illuminate.*

      • Master warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The pre-crash safety city sensor does not receive data from the brake actuator assembly for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the pre-crash safety city sensor is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 8 seconds.

      • PCS OFF warning light flashes.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator light does not illuminate.*

      • Master warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module The pre-crash safety city sensor does not receive data from the combination meter assembly for 80 seconds or more.

      All conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the pre-crash safety city sensor is 10 V or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 83 seconds or more.

      • PCS OFF warning light flashes.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator light does not illuminate.*

      • Master warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U023A Lost Communication with Front Camera Module The brake actuator assembly does not receive data from the pre-crash safety city sensor for 2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON for 3 seconds or more.

      • The power source voltage of the pre-crash safety city sensor is 10 V or more.

      		 Turn the ignition switch to ON and wait at least 5 seconds.

      • PCS OFF warning light flashes.

      • Displays messages on the multi-information display.

      • Master warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.

    16. Steering Sensor (Spiral Cable with Sensor Sub-assembly) / GTS Display "-"

      Tech Tips

      The steering sensor (spiral cable with sensor sub-assembly) is connected to the CAN communication system, but the steering sensor (spiral cable with sensor sub-assembly) does not store or output CAN communication DTCs.

    17. Airbag Sensor Assembly / GTS Display "Airbag"

      Tech Tips

      The airbag sensor assembly is connected to the CAN communication system, but the airbag sensor assembly does not store or output CAN communication DTCs.

    18. Central Gateway ECU (Network Gateway ECU) / GTS Display "Central Gateway"

      Tech Tips

      The central gateway ECU (network gateway ECU) is connected to the CAN communication system, but the central gateway ECU (network gateway ECU) does not store or output CAN communication DTCs.

  5. CAN BUS WAVEFORMS

    A01T9YDE02

    Tech Tips


    • The following waveform is measured between terminals CANH and GND, and terminals CANL and GND of the central gateway ECU (network gateway ECU). (Use this as a reference for diagnosis of CAN communication lines.)

    • When malfunctions in multiple ECUs are suspected based on the CAN bus check and DTCs checked using the GTS, check the resistance of the CAN bus using an ohmmeter first. If no problems are found, check the following waveforms.

      Click here

    • If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main bus line, an open in a CAN branch line, or a short between a CAN line (CANH or CANL) and ground is suspected (Group 2).

    • Wiggle the connector and wire harness to check if the waveform changes.


    1. CAN bus waveforms (Group 1)


      1. A01TB9LN07
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Normal waveform

      2. A01T8QCN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in both of the lines (CANH and CANL) of a CAN branch

        Tech Tips


        • Waveforms (waveforms shown using dotted lines) are not present from an ECU or sensor connected to a CAN branch with an open circuit in both lines. (Waveforms from other ECUs or sensors are normal.)

        • Because this waveform is similar to a normal waveform, instead of using the waveform, the malfunctioning part can be narrowed down by performing a CAN bus check.

      3. A01T9CKN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Short between the CAN bus lines (CANH and CANL)

        Tech Tips


        • Waveforms disappear.

        • If the malfunction is in an ECU, disconnecting the ECU will change the waveform. If the waveform does not change, a malfunction in the wire harness is suspected.

    2. CAN bus waveforms (reference) (Group 2)

      Note

      The following CAN bus waveforms can be used only as reference. The actual measured waveform may differ significantly depending on the location of the open or short circuit.


      1. A01T9QDN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN branch line (CANH)

        Tech Tips


        • An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.

        • Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

      2. A01T8WLN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN branch line (CANL)

        Tech Tips


        • An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.

        • Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

      3. A01TCMMN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN main bus line (CANH)

        Tech Tips


        • Waveforms of ECUs or sensors that are closer to the central gateway ECU (network gateway ECU) than the open part are almost normal.

        • Waveforms of ECUs or sensors that are on the opposite side of the central gateway ECU (network gateway ECU) from the open part are abnormal.

        • An open in a CAN main bus line can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.

      4. A01TBKUN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Short between a CAN bus line (CANH) and ground

        Tech Tips


        • Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.

        • A short to ground in the CANH line can be confirmed by measuring the resistance between CANH and ground using an ohmmeter.

      5. A01TBA7N05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Short between a CAN bus line (CANL) and ground

        Tech Tips


        • Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.

        • A short to ground in the CANL line can be confirmed by measuring the resistance between CANL and ground using an ohmmeter.

  6. DATA SENDING/RECEIVING TABLE


    1. Data sending/receiving table

      Tech Tips

      If Data List items related to sent/received data are not displayed properly, the part for which communication is interrupted can be determined using the table below.

      Data Content Data Detected and Sent by Data Received by Relevant Data List Item
      Can be Checked in the Data List Cannot be Checked in the Data List Selected System Data List Item Link
      Engine speed ECM

      • Brake actuator assembly

      • Power steering ECU with motor assembly

      • Combination meter assembly

      • Certification ECU (smart key ECU assembly)

      • Engine stop and start ECU

      • Airbag sensor assembly

      • Air conditioning amplifier assembly

      • Main body ECU (multiplex network body ECU)

      • Radio and display receiver assembly

      • Clearance warning ECU assembly

      		 Engine and ECT Engine Speed

      for 1NR-FE

      Click here

      for 1ND-TV

      for 1ZR-FAE

      Click here

      ABS/VSC/TRC Engine Revolutions

      Click here

      EMPS Engine Revolution

      Click here

      Combination Meter Engine Rpm

      Click here

      Starting Control Engine Speed

      Click here

      Stop and Start Engine Spd (ECM)

      Click here

      Accelerator position ECM (1NR-FE/1ZR-FAE)

      • Brake actuator assembly

      • Engine stop and start ECU

      		 Pre-crash safety city sensor Engine and ECT Accelerator Position

      for 1NR-FE

      Click here

      for 1ZR-FAE

      Click here

      ABS/VSC/TRC Accelerator Opening Angle %

      Click here

      Stop and Start Accelerator Position

      Click here

      Accel position ECM (1ND-TV)

      • Brake actuator assembly

      • Engine stop and start ECU

      		 Pre-crash safety city sensor Engine and ECT Accel Position
      ABS/VSC/TRC Accelerator Opening Angle %

      Click here

      Stop and Start Accelerator Position

      Click here

      Shift position ECM (1NR-FE)

      • Certification ECU (smart key ECU assembly)

      • Radio and display receiver assembly

      • Engine stop and start ECU

      • Airbag sensor assembly

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • Clearance warning ECU assembly

      • Pre-crash safety city sensor

      		 Power Source Control Shift P Signal

      Click here

      Navigation System Reverse Signal
      Stop and Start Neutral Switch

      Click here

      Shift position ECM (1ND-TV/1ZR-FAE)

      • Certification ECU (smart key ECU assembly)

      • Radio and display receiver assembly

      • Engine stop and start ECU

      • Airbag sensor assembly

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • Clearance warning ECU assembly

      • Pre-crash safety city sensor

      		 Engine and ECT Neutral Position SW Signal

      for 1ND-TV

      Click here

      for 1ZR-FAE

      Click here

      Power Source Control Shift P Signal

      Click here

      Navigation System Reverse Signal
      Stop and Start Neutral Switch

      Click here

      Engine coolant temperature ECM

      • Air conditioning amplifier assembly

      • Combination meter assembly

      • Engine stop and start ECU

      		 - Engine and ECT Coolant Temp

      for 1NR-FE

      Click here

      for 1ND-TV

      for 1ZR-FAE

      Click here

      Air Conditioner Engine Coolant Temp
      Combination Meter Coolant Temperature

      Click here

      Stop and Start Coolant Temp

      Click here

      Vehicle speed Brake actuator assembly

      • ECM

      • Combination meter assembly*3

      • Power steering ECU with motor assembly

      • Engine stop and start ECU

      • Radio and display receiver assembly

      • Airbag sensor assembly

      • Clearance warning ECU assembly

      • Pre-crash safety city sensor

      		 ABS/VSC/TRC Vehicle Speed

      Click here

      Engine and ECT Vehicle Speed

      for 1NR-FE

      Click here

      for 1ND-TV

      for 1ZR-FAE

      Click here

      Combination Meter Vehicle Speed Meter

      Click here

      EMPS Meter Vehicle Velocity

      Click here

      Stop and Start Vehicle Spd1 (ABS/VSC)

      Click here

      Navigation System Vehicle Speed
      Combination meter assembly*3 Certification ECU (smart key ECU assembly)

      • Air conditioning amplifier assembly

      • Main body ECU (multiplex network body ECU)

      		 Combination Meter Vehicle Speed Meter

      Click here

      Power Source Control Vehicle Speed Signal

      Click here

      Wheel speed Brake actuator assembly

      • Headlight leveling ECU assembly

      • Power steering ECU with motor assembly

      • ECM

      • Engine stop and start ECU

      • Clearance warning ECU assembly

      • Pre-crash safety city sensor

      		 ABS/VSC/TRC

      • FR Wheel Speed

      • FL Wheel Speed

      • RR Wheel Speed

      • RL Wheel Speed

      Click here

      HL AutoLeveling

      • Front Right Wheel Speed Value

      • Front Left Wheel Speed Value

      Click here

      EMPS

      • Wheel Speed Right

      • Wheel Speed Left

      Click here

      Ambient temperature Air conditioning amplifier assembly

      • ECM (1NR-FE/1ZR-FAE)

      • Engine stop and start ECU

      • Main body ECU (multiplex network body ECU)

      • Clearance warning ECU assembly

      • Pre-crash safety city sensor

      		 Air Conditioner Ambient Temp Sensor
      Engine and ECT Ambient Temp for A/C

      for 1ZR-FAE

      Click here

      Ambient temperature

      for 1NR-FE

      Click here

      Stop and Start Ambient Temp Sensor

      Click here

      Driver door courtesy switch Main body ECU (multiplex network body ECU) Engine stop and start ECU

      • ECM

      • Certification ECU (smart key ECU assembly)

      • Combination meter assembly*2

      		 Main Body

      • FR Door Courtesy SW*4

      • FL Door Courtesy SW*5

      Click here

      Stop and Start D Courtesy Switch Signal

      Click here

      Ignition switch condition Main body ECU (multiplex network body ECU) - Certification ECU (smart key ECU assembly)*1 Main Body IG SW

      Click here

      Steering angle sensor Steering sensor (spiral cable with sensor sub-assembly)

      • Brake actuator assembly

      • Power steering ECU with motor assembly

      • Airbag sensor assembly

      • Clearance warning ECU assembly

      • Engine stop and start ECU

      • Pre-crash safety city sensor

      		 ABS/VSC/TRC Steering Angle Sensor

      Click here

      EMPS Steering Angle

      Click here

      Yaw rate sensor Airbag sensor assembly Brake actuator assembly

      • Clearance warning ECU assembly

      • Power steering ECU with motor assembly

      • Pre-crash safety city sensor

      		 ABS/VSC/TRC Yaw Rate Sensor

      Click here

      Deceleration sensor Airbag sensor assembly

      • Brake actuator assembly

      • Engine stop and start ECU

      • ECM

      • Clearance warning ECU assembly

      • Power steering ECU with motor assembly

      • Pre-crash safety city sensor

      		 ABS/VSC/TRC

      • Deceleration Sensor

      • Deceleration Sensor2

      Click here

      Stop and Start Dec Sensor Calibration

      Click here

      Power steering assist current value Power steering ECU with motor assembly Engine stop and start ECU Clearance warning ECU assembly EMPS Motor Actual Current

      Click here

      Stop and Start EPS Load

      Click here

      Eco drive control mode Engine stop and start ECU Power steering ECU with motor assembly

      • ECM

      • Brake actuator assembly

      • Air conditioning amplifier assembly

      • Radio and display receiver assembly

      • Certification ECU (smart key ECU assembly)

      • Clearance warning ECU assembly

      		 Stop and Start Stop&Start of Eng State

      Click here

      EMPS Stop&Start Ctrl Mode

      Click here

      Side turn signal Combination meter assembly -

      • Clearance warning ECU assembly

      • Pre-crash safety city sensor

      		 - - -
      Brake actuator assembly power source voltage*1 Brake actuator assembly - - ABS/VSC/TRC IG1 Voltage Value

      Click here

      Power steering ECU with motor assembly power source voltage*1 Power steering ECU with motor assembly - - EMPS IG Power Supply

      Click here

      Driver door touch sensor*1 Certification ECU (smart key ECU assembly) - - Entry&Start D-Door Touch Sensor

      Click here

      ECM power source voltage*1 ECM - - Engine and ECT Battery Voltage

      for 1NR-FE

      Click here

      for 1ND-TV

      for 1ZR-FAE

      Click here

      Combination meter assembly power source voltage*1 Combination meter assembly - - Combination Meter +B Voltage Value

      Click here

      Solar sensor*1 Air conditioning amplifier assembly - - Air Conditioner Solar Sensor (D Side)

      Click here

      Headlight leveling ECU assembly power source voltage*1 Headlight leveling ECU assembly - - HL AutoLeveling +B

      Click here

      Engine stop and start ECU power source voltage*1 Engine stop and start ECU - - Stop and Start Battery Voltage

      Click here

      Radio and display receiver assembly power source voltage*1 Radio and display receiver assembly - - Navigation System Battery Voltage

      *1: Whether the ECU that sends data is functioning or not can be judged by using the GTS to check items such as switches or sensors that send signals to the ECU via direct lines.

      *2: Although the received contents cannot be checked in the Data List, whether or not the data is received normally can be checked by observing the combination meter.

      *3: The combination meter assembly receives a vehicle speed signal from the brake actuator assembly and sends the signal to other ECUs.

      *4: for RHD

      *5: for LHD