CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM

BUS CHECK (COMMUNICATION MALFUNCTION ECU)

Only CAN communication system DTCs for each ECU can be output to the intelligent tester.

1. 

   Select "Bus Check" from the "System Select" screen on the intelligent tester.

2. 

   Select "Communication Malfunction DTC" from the "Bus Check" screen, and then select "Enter".

3. 

   Select the system of the DTC to be checked and select "Details".

4. 

   CAN communication system DTCs are output.

BUS CHECK (COMMUNICATION BUS CHECK)

1. 

   Select "Communication Bus Check" from the "Bus Check" screen.

2. The screen displays the ECUs and sensors that are properly connected to the CAN communication system.

   Tip:

   • If any properly connected ECUs or sensors are not displayed, there is a communication stop in the system (Click here).

   • 

     The default item displayed in the combo box is "ALL". When checking the ECUs (sensors) connected to each bus, pull down the combo box and select the bus to be checked from the drop-down list. The drop-down list displays "ALL", "V Bus" and the names of the remaining buses.

     Combo Box	Display Content
     ALL	All ECUs (sensors) connected to the CAN bus
     V Bus	ECUs (sensors) connected to the V Bus
     Bus Name	ECUs (sensors) connected to the selected bus

   • The connection status (shown below) is indicated by the background color displayed behind the system name.

     Table 1. ECU (Sensor) on V Bus

     Background Color	Connection Status
     White	Detected normally
     Yellow	Could not be detected in the past, but is currently detected
     Red	Detected in the past, but cannot be detected now
     Not displayed	Has never been detected

     Table 2. ECU (Sensor) with no Data Monitor History

     Background Color	Connection Status
     White	Detected normally
     Yellow	Could not be detected in the past, but is currently detected
     Red	Detected in the past, but cannot be detected now
     Not displayed	Has never been detected

     Table 3. ECU (Sensor) with Data Monitor History

     Background Color	Connection Status
     White	Detected normally
     Yellow	Could not be detected in the past, but is currently detected
     Red	Detected in the past, but cannot be detected now
     Red	Has never been detected but has connection history
     Not displayed	Has never been detected and has no connection history

3. 

   "There is no system connected the communication bus." is displayed if there are no ECUs or sensors connected to the CAN bus.

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

1. Systems (ECUs and sensors) that use CAN communication vary depending on the optional settings of the vehicle. Check which systems (ECUs and sensors) are installed on the vehicle.

   ECU/Sensor Name	Tester Display	Installed on
   ECM	ECM (Engine)	All vehicles
   Master cylinder solenoid (skid control ECU)	Skid Control (ABS/VSC/TRAC)	All vehicles
   Yaw rate sensor assembly	Yaw Rate Sensor	All vehicles
   Spiral with sensor cable sub-assembly	Spiral cable (Steering Angle Sensor)	All vehicles
   Center airbag sensor assembly	Airbag	All vehicles
   Certification ECU	Certification (Smart)	All vehicles
   Main body ECU (multiplex network body ECU)	Main Body	All vehicles
   Combination meter assembly	Combination Meter	All vehicles
   Power management control ECU	Power Management1 Power Management	All vehicles
   Display and navigation module display	Display and Navigation (AVN1)	Vehicles with a navigation system
   Four wheel drive control ECU	Four Wheel Drive Control	All vehicles
   Air conditioning amplifier assembly	Air Conditioning Amplifier	All vehicles
   Multiplex tilt and telescopic ECU	Multiplex Tilt and Telescopic	All vehicles
   Front power seat switch LH	D-Seat	All vehicles
   Driving support switch control ECU	D-SEAT SW	All vehicles
   Parking assist ECU	Parking Assist (Intelligent Parking Assist)	Vehicles with a LEXUS parking assist-sensor system (with parking assist monitor system and/or side monitor system)
   Clearance warning ECU assembly	Clearance Warning (Clearance Sonar)	Vehicles with a LEXUS parking assist-sensor system (without parking assist monitor system and/or side monitor system)
   Driving support ECU assembly	Driving Support (Cruise Control-ACC)	Vehicles with a pre-crash safety system
   Headlight swivel ECU assembly (AFS ECU)	Headlight swivel (AFS)	All vehicles
   Seat belt control ECU	Seat Belt Control (Pre-Crash)	Vehicles with a pre-crash safety system
   Suspension control ECU	Suspension Control (Air Suspension)	All vehicles
   Stabilizer control ECU	Stabilizer Control (KDSS)	All vehicles
   Outer mirror control ECU assembly LH	Front Door LH/L-Mirror (FL-Door2/L-Miror)	All vehicles
   Outer mirror control ECU assembly RH	Front Door RH/R-Mirror (FR-Door2/R-Miror)	All vehicles
   Millimeter wave radar sensor assembly	-	Vehicles with a pre-crash safety system

DTC TABLE BY ECU

1. ECM

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   U0100*	Lost Communication with ECM/PCM "A"
   U0122	Lost Communication with Vehicle Dynamics Control Module
   U0123	Lost Communication with Yaw Rate Sensor Module
   U0126	Lost Communication with Steering Angle Sensor Module
   U0235*	Lost Communication with Cruise Control Front Distance Range Sensor
   U1102*	Lost Communication with Radar Sensor
   U1104*	Lost Communication with Driving Support ECU

   Tip:

   *: Refer to the Diagnostic Trouble Code Chart (Click here).

2. MASTER CYLINDER SOLENOID (SKID CONTROL ECU)

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   U0073	Control Module Communication Bus OFF
   U0100	Lost Communication with ECM/PCM "A"
   U0114	Lost Communication with 4WD Control Module
   U0123	Lost Communication with Yaw Rate Sensor Module
   U0124	Lost Communication with Lateral Acceleration Sensor Module
   U0126	Lost Communication with Steering Angle Sensor Module

3. MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0101	Lost Communication with TCM
   U0151	Lost Communication with Restraints Control Module
   U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module
   U0164	Lost Communication with HVAC Control Module
   U0182	Lost Communication with AFS
   U0199	Lost Communication with "Door Control Module A"
   U0200	Lost Communication with "Door Control Module B"
   U0208	Lost Communication with "Seat Control Module A"
   U0327	Software Incompatibility with Vehicle Security Control Module
   U1002	Lost Communication with Gateway Module (MS Bus)
   U1114	Lost Communication with Main Switch Module
   U1115	Lost Communication with Tilt & Telescopic Module
   U1133	Lost Communication with PMN Module

4. COMBINATION METER ASSEMBLY

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0129	Lost Communication with Brake System Control Module
   U0142	Lost Communication with Body Control Module "B"
   U0151	Lost Communication with Restraints Control Module

5. MULTIPLEX TILT AND TELESCOPIC ECU

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   B2621*	Communication Interruption
   B2624*	Vehicles Speed

   • *: Refer to Power Tilt and Power Telescopic Steering Column System (Click here).

6. CENTER AIRBAG SENSOR ASSEMBLY

   Tip:

   The center airbag sensor assembly is connected to the CAN communication system but CAN communication DTCs are not stored.

7. CERTIFICATION ECU

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0142	Lost Communication with Body Control Module "B"
   U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module
   B2779*	Engine Starter Communication Malfunction

   Tip:

   *: Refer to the Engine Immobiliser System (Click here).

8. AIR CONDITIONING AMPLIFIER ASSEMBLY

   Tip:

   DTC communication uses the CAN communication system.

   DTC Code	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0142	Lost Communication with Body Control Module "B"
   U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module

9. FRONT POWER SEAT SWITCH LH

   Tip:

   The front power seat switch LH is connected to the CAN communication system but CAN communication DTCs are not stored.

10. YAW RATE SENSOR ASSEMBLY

    Tip:

    The yaw rate sensor assembly is connected to the CAN communication system but CAN communication DTCs are not stored.

11. SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    Tip:

    The spiral with sensor cable sub-assembly is connected to the CAN communication system but CAN communication DTCs are not stored.

12. HEADLIGHT SWIVEL ECU ASSEMBLY (AFS ECU)

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0073	Control Module Communication Bus Off
    U0100	Lost Communication with ECM/PCM "A"
    U0126	Lost Communication with Steering Angle Sensor Module
    U0129	Lost Communication with Brake System Control Module
    U0142	Lost Communication with Body Control Module "B"
    U1000	CAN Communication Failure (Message Registry)
    U1121	Lost Communication with Driver Module

13. DISPLAY AND NAVIGATION MODULE DISPLAY

    • For vehicles with a navigation system.

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0073	Sending Malfunction (Navigation to APGS)
    U0126	Steering Sensor Communication
    U0155	Meter ECU Communication
    U0164	Air Conditioner ECU Communication
    U1110	Clearance Sonar ECU Communication

14. POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT1)

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0104	Lost Communication with Cruise Control Module
    U0132	Lost Communication with Ride Level Control Module
    U0139	Lost Communication with Suspension Control Module B
    U0182	Lost Communication with Lighting Control Module Front
    U1002	Lost Communication with Gateway Module (Power Management2)
    U1100	Lost Communication with Pre-Crash Module
    U110B	Lost Communication with Parking Assist Control Module "B"
    U1110	Lost Communication with Clearance Sonar Module

15. POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT)

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0164	Lost Communication with HVAC Control Module
    U1002	Lost Communication with Gateway Module (Power Management1)

16. POWER MANAGEMENT CONTROL ECU

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0129	Lost Communication with Brake System Control Module

17. DRIVING SUPPORT ECU ASSEMBLY

    • For vehicles with a pre-crash safety system.

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0123	Lost Communication with Yaw Rate Sensor Module
    U0126	Lost Communication with Steering Angle Sensor Module
    U0235*	Lost Communication with Cruise Control Front Distance Range Sensor
    U1002*	Lost Communication with Gateway Module (Sensor Bus)
    U1100	Lost Communication with Pre-Crash Module
    U1104*	Lost Communication with Driving Support ECU

    Tip:

    *: Refer to Diagnostic Trouble Code Chart (Click here).

18. SEAT BELT CONTROL ECU

    • For vehicles with a pre-crash safety system.

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0140	Lost Communication with J/B ECU
    U0151	Lost Communication with Restraints Control Module
    U1104	Lost Communication with Driving Support ECU

19. PARKING ASSIST ECU

    • For vehicles with a LEXUS parking assist-sensor system (with parking assist monitor system and/or side monitor system).

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0073	Control Module Communication Bus Off
    U0100	Lost Communication with ECM/PCM "A"
    U0126	Lost Communication with Steering Angle Sensor Module
    U0129	Lost Communication with Brake System Control Module
    U0140	Lost Communication with Body Control Module
    U0155	Lost Communication with Meter Control Module
    U1114	Lost Communication with Main Switch Module

20. CLEARANCE WARNING ECU ASSEMBLY

    • For vehicles with a LEXUS parking assist-sensor system (without parking assist monitor system and/or side monitor system).

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0101	Lost Communication with TCM
    U0142	Lost Communication with Body Control Module "B"
    U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module

21. SUSPENSION CONTROL ECU

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0114	Lost Communication with Four-Wheel Drive Clutch Control Module
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0124	Lost Communication with Lateral Acceleration Sensor Module
    U0126	Lost Communication with Steering Angle Sensor Module
    U0140	Lost Communication with Body Control Module

22. STABILIZER CONTROL ECU

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0124	Lost Communication with Lateral Acceleration Sensor Module
    U0126	Lost Communication with Steering Angle Sensor Module

23. DRIVING SUPPORT SWITCH CONTROL ECU

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0142	Main Body ECU Communication Circuit

24. OUTER MIRROR CONTROL ECU ASSEMBLY RH

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0142	Lost Communication with Body Control Module "B"

25. OUTER MIRROR CONTROL ECU ASSEMBLY LH

    Tip:

    DTC communication uses the CAN communication system.

    DTC Code	Detection Item
    U0142	Lost Communication with Body Control Module "B"

26. MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    • For vehicles with a pre-crash safety system.

    Tip:

    The millimeter wave radar sensor assembly is connected to the CAN communication system but CAN communication DTCs are not output.

DTC COMBINATION TABLE