CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) Check Bus 2 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

  • Short in CAN main bus wire

  • Short in CAN branch wire

  • Central gateway ECU (network gateway ECU)

  • ECM

  • Air conditioning amplifier assembly

  • 4 wheel drive control ECU (4WD control ECU)

  • Certification ECU (smart key ECU assembly)*1

  • Power steering ECU assembly

  • Master cylinder solenoid (skid control ECU)*2

  • Brake actuator assembly (skid control ECU)*3

  • Airbag sensor assembly

  • Spiral cable with steering angle sensor

  • Combination meter assembly

  • Tire pressure warning ECU and receiver*4

  • Main body ECU (multiplex network body ECU)

  • No. 1 headlight ECU sub-assembly LH*5

  • No. 2 CAN junction connector

  • No. 6 CAN junction connector
*1: w/ Entry and Start System
*2: except 2TR-FE
*3: for 2TR-FE
*4: w/ Tire Pressure Warning System
*5: for LED Headlight

WIRING DIAGRAM

B001F7VE01
B001CDWE01

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

    Click here

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

  • Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. CHECK FOR SHORT IN CAN BUS WIRES (NO. 6 CAN JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the No. 6 CAN junction connector.

      B001DAJC42
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Connector
      *c to 4 Wheel Drive Control ECU (4WD Control ECU) *d to Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System)
      *e to No. 1 Headlight ECU Sub-assembly LH (for RHD with LED Headlight) *f to Tire Pressure Warning ECU and Receiver (for RHD with Tire Pressure Warning System)
      *g to Central Gateway ECU (Network Gateway ECU) *h to Air Conditioning Amplifier Assembly
      *i to Power Steering ECU Assembly *j to Brake Actuator Assembly (Skid Control ECU) (for 2TR-FE)
      *k to ECM - -

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G290-1 (CANH) - G290-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      G290-2 (CANH) - G290-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher 4 Wheel drive control ECU (4WD control ECU)
      G290-3 (CANH) - G290-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)*1
      G290-4 (CANH) - G290-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher No. 1 headlight ECU sub-assembly LH*2
      G290-5 (CANH) - G290-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Tire pressure warning ECU and receiver*3
      G290-6 (CANH) - G290-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Central gateway ECU (network gateway ECU)
      G290-7 (CANH) - G290-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
      G290-8 (CANH) - G290-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Power steering ECU assembly
      G290-9 (CANH) - G290-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Brake actuator assembly (skid control ECU)*4
      G290-10 (CANH) - G290-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      *1: w/ Entry and Start System
      *2: for RHD with LED Headlight
      *3: for RHD with Tire Pressure Warning System
      *4: for 2TR-FE
      Result
      Result Proceed to
      OK A
      NG (Central gateway ECU [network gateway ECU] CAN branch wire) B
      NG (ECM CAN main wire) C
      NG (No. 2 CAN junction connector CAN main wire) D
      NG (Wire to ECU or sensor) E

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTOR Click here

    D

    CONNECT CONNECTOR Click here

    E

    GO TO STEP 10 Click here

    B

  2. CONNECT CONNECTOR


    1. Reconnect the G290 No. 6 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)


    1. B001DJBC22
      *a

      Front view of wire harness connector

      (to Central Gateway ECU [Network Gateway ECU])

      Disconnect the central gateway ECU (network gateway ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G229-18 (CA4H) - G229-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)

  4. CONNECT CONNECTOR


    1. Reconnect the G290 No. 6 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR SHORT IN CAN BUS WIRES (ECM - NO. 6 CAN JUNCTION CONNECTOR)


    1. Disconnect the ECM connector.

      B001D4SC01
      *A for 1GR-FE *B for Manual Transmission
      *C for Automatic Transmission *D for 1KD-FTV
      *E for 2TR-FE *F for 1GD-FTV
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for 1GR-FE with Manual Transmission
      Tester Connection Condition Specified Condition
      G56-32 (CANH) - G56-31 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 1GR-FE with Automatic Transmission
      Tester Connection Condition Specified Condition
      G56-31 (CANH) - G56-25 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G58-35 (CANH) - G58-36 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G181-13 (CANH) - G181-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 1GD-FTV
      Tester Connection Condition Specified Condition
      G184-17 (CANH) - G184-28 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1GR-FE: Click here
    REPLACE ECM for 1KD-FTV: Click here
    REPLACE ECM for 2TR-FE: Click here
    REPLACE ECM for 1GD-FTV: Click here

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR)

  6. CONNECT CONNECTOR


    1. Reconnect the G290 No. 6 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 2 CAN junction connector.

      B001DAJC43
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 6 CAN Junction Connector
      *c to Spiral Cable with Steering Angle Sensor *d to Airbag Sensor Assembly
      *e to No. 1 Headlight ECU Sub-assembly LH (for LHD with LED Headlight) *f to Tire Pressure Warning ECU and Receiver (for LHD with Tire Pressure Warning System)
      *g to Combination Meter Assembly *h to Main Body ECU (Multiplex Network Body ECU)
      *i to Master Cylinder Solenoid (Skid Control ECU) (except 2TR-FE) - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G286-1 (CANH) - G286-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 CAN junction connector
      G286-2 (CANH) - G286-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Spiral cable with steering angle sensor
      G286-3 (CANH) - G286-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Airbag sensor assembly
      G286-4 (CANH) - G286-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher No. 1 headlight ECU sub-assembly LH*1
      G286-7 (CANH) - G286-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Tire pressure warning ECU and receiver*2
      G286-8 (CANH) - G286-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      G286-9 (CANH) - G286-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      G286-10 (CANH) - G286-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Master cylinder solenoid (skid control ECU)*3
      *1: for LHD with LED Headlight
      *2: for LHD with Tire Pressure Warning System
      *3: except 2TR-FE
      Result
      Result Proceed to
      OK A
      NG (Combination meter assembly CAN main wire) B
      NG (No. 6 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR)

    D

    CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR) Click here

    B

  8. CONNECT CONNECTOR


    1. Reconnect the G286 No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)


    1. B001GYBC08
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the combination meter assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G304-40 (CANH) - G304-39 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)

  10. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)


    1. B001G49C12
      *a

      Component with harness connected

      (Central Gateway ECU [Network Gateway ECU])

      Reconnect the wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

      Click here

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G229-18 (CA4H) - G229-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Tech Tips

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPLACE CORRESPONDING ECU OR SENSOR