CAN COMMUNICATION SYSTEM Check Bus 2 Line for Short to +B

DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when no resistance exists between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

Symptom Trouble Area
No resistance exists between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

  • Short to +B in CAN main bus line

  • Short to +B in CAN branch line

  • Central gateway ECU (network gateway ECU)

  • Power management control ECU

  • ECM

  • Main body ECU (multiplex network body ECU)

  • Combination meter assembly

  • Skid control ECU (brake booster with master cylinder assembly)

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

  • Yaw rate and acceleration sensor

  • Power steering ECU assembly

  • Airbag sensor assembly

  • Transmission control ECU assembly

  • Certification ECU (smart key ECU assembly)

  • CAN No. 1 junction connector

  • CAN No. 2 junction connector

  • CAN No. 3 junction connector

WIRING DIAGRAM

Figure 1. for LHD

B001MUJE01
B001L6BE01

Figure 2. for RHD

B001NFOE02
B001KTAE02

CAUTION / NOTICE / HINT

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

    Click here

  • 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

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 VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 2 JUNCTION CONNECTOR) Click here

    A

  2. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 2 JUNCTION CONNECTOR)


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

    2. Disconnect the H104 CAN No. 2 junction connector.

    3. B001MGKC01
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *b to CAN No. 1 Junction Connector
      *c to CAN No. 3 Junction Connector
      *d to Central Gateway ECU (Network Gateway ECU)
      *e to Power Steering ECU Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H104-1 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 1 junction connector
      H104-2 (CANL) - H44-16 (BAT)
      H104-4 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 3 junction connector
      H104-5 (CANL) - H44-16 (BAT)
      H104-7 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      H104-8 (CANL) - H44-16 (BAT)
      H104-10 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Power steering ECU assembly
      H104-11 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to CAN No. 1 junction connector) B
      NG (Line to CAN No. 3 junction connector) C
      NG (Line to central gateway ECU (network gateway ECU)) D
      NG (Line to ECU or sensor) E

    B

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 1 JUNCTION CONNECTOR) Click here

    C

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 3 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) Click here

    E

    CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR) Click here

    A

  3. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 2 JUNCTION CONNECTOR)


    1. Disconnect the H105 CAN No. 2 junction connector.

    2. B001MGKC02
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *b to Steering Angle Sensor (Spiral Cable with Sensor Sub-assembly)
      *c to Certification ECU (Smart Key ECU Assembly)
      *d to Airbag Sensor Assembly
      *e to Yaw Rate and Acceleration Sensor

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H105-3 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Steering angle sensor (spiral cable with sensor sub-assembly)
      H105-2 (CANL) - H44-16 (BAT)
      H105-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Certification ECU (smart key ECU assembly)
      H105-5 (CANL) - H44-16 (BAT)
      H105-9 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Airbag sensor assembly
      H105-8 (CANL) - H44-16 (BAT)
      H105-12 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Yaw rate and acceleration sensor
      H105-11 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to ECU or sensor) B

    A

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

    B

    GO TO STEP 9 Click here

  4. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 1 JUNCTION CONNECTOR)


    1. Disconnect the H112 CAN No. 1 junction connector.

    2. B001MPEC02
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to Main Body ECU (Multiplex Network Body ECU)
      *c to CAN No. 2 Junction Connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H112-5 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Main body ECU (multiplex network body ECU)
      H112-11 (CANL) - H44-16 (BAT)
      H112-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 2 Junction Connector
      H112-12 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to CAN No. 2 junction connector) B
      NG (Line to ECU or sensor) C

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - CAN NO. 2 JUNCTION CONNECTOR)

    C

    GO TO STEP 9 Click here

    A

  5. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 1 JUNCTION CONNECTOR)


    1. Disconnect the A57 CAN No. 1 junction connector.

    2. B001MPEC01
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to ECM
      *c to Skid Control ECU (Brake Booster with Master Cylinder Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A57-1 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher ECM
      A57-7 (CANL) - H44-16 (BAT)
      A57-2 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Skid control ECU (brake booster with master cylinder assembly)
      A57-8 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to ECU or sensor) B

    A

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

    B

    GO TO STEP 9 Click here

  6. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 3 JUNCTION CONNECTOR)


    1. Disconnect the H113 CAN No. 3 junction connector.

    2. B001MPEC03
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Power Management Control ECU
      *c to CAN No. 2 Junction Connector
      *d to Combination Meter Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H113-4 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Power management control ECU
      H113-10 (CANL) - H44-16 (BAT)
      H113-5 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 2 Junction Connector
      H113-11 (CANL) - H44-16 (BAT)
      H113-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Combination meter assembly
      H113-12 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to CAN No. 2 junction connector) B
      NG (Line to ECU or sensor) C

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - CAN NO. 3 JUNCTION CONNECTOR)

    C

    GO TO STEP 9 Click here

    A

  7. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 3 JUNCTION CONNECTOR)


    1. Disconnect the A58 CAN No. 3 junction connector.

    2. B001MPEC04
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Transmission Control ECU Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A58-1 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Transmission control ECU assembly
      A58-7 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to ECU or sensor) B

    A

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

    B

    GO TO STEP 9 Click here

  8. CHECK FOR SHORT TO +B IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Disconnect the H188 central gateway ECU (network gateway ECU) connector.

    2. B001MPJC79
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H188-18 (CA4H) - H188-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      H188-17 (CA4L) - H188-1 (BATT)
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

  9. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected.

      Click here

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

      B001L5OC37
      *1 DLC3 - -
      *a

      Component with harness connected

      (Central Gateway ECU (Network Gateway ECU))

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      H188-18 (CA4H) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      H188-17 (CA4L) - H44-16 (BAT)

      Tech Tips


      • If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.

      Result
      Result
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 2 JUNCTION CONNECTOR)


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

    2. Disconnect the H104 CAN No. 2 junction connector.

    3. B001MGKC01
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *b to CAN No. 1 Junction Connector
      *c to CAN No. 3 Junction Connector
      *d to Central Gateway ECU (Network Gateway ECU)
      *e to Power Steering ECU Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H104-1 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 1 junction connector
      H104-2 (CANL) - H44-16 (BAT)
      H104-4 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 3 junction connector
      H104-5 (CANL) - H44-16 (BAT)
      H104-7 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      H104-8 (CANL) - H44-16 (BAT)
      H104-10 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Power steering ECU assembly
      H104-11 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to CAN No. 1 junction connector) B
      NG (Line to CAN No. 3 junction connector) C
      NG (Line to central gateway ECU (network gateway ECU)) D
      NG (Line to ECU or sensor) E

    B

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 1 JUNCTION CONNECTOR) Click here

    C

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 3 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) Click here

    E

    CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR) Click here

    A

  11. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 2 JUNCTION CONNECTOR)


    1. Disconnect the H105 CAN No. 2 junction connector.

    2. B001MGKC02
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *b to Steering Angle Sensor (Spiral Cable with Sensor Sub-assembly)
      *c to Certification ECU (Smart Key ECU Assembly)
      *d to Airbag Sensor Assembly
      *e to Yaw Rate and Acceleration Sensor

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H105-3 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Steering angle sensor (spiral cable with sensor sub-assembly)
      H105-2 (CANL) - H44-16 (BAT)
      H105-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Certification ECU (smart key ECU assembly)
      H105-5 (CANL) - H44-16 (BAT)
      H105-9 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Airbag sensor assembly
      H105-8 (CANL) - H44-16 (BAT)
      H105-12 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Yaw rate and acceleration sensor
      H105-11 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to ECU or sensor) B

    A

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

    B

    GO TO STEP 17 Click here

  12. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 1 JUNCTION CONNECTOR)


    1. Disconnect the H141 CAN No. 1 junction connector.

    2. B001MPEC05
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to Power Management Control ECU
      *c to Main Body ECU (Multiplex Network Body ECU)
      *d to CAN No. 2 Junction Connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H141-4 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Power management control ECU
      H141-10 (CANL) - H44-16 (BAT)
      H141-5 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Main body ECU (multiplex network body ECU)
      H141-11 (CANL) - H44-16 (BAT)
      H141-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 2 Junction Connector
      H141-12 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to CAN No. 2 junction connector) B
      NG (Line to ECU or sensor) C

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - CAN NO. 2 JUNCTION CONNECTOR)

    C

    GO TO STEP 17 Click here

    A

  13. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 1 JUNCTION CONNECTOR)


    1. Disconnect the A71 CAN No. 1 junction connector.

    2. B001MPEC06
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to ECM
      *c to Transmission Control ECU Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A71-1 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher ECM
      A71-7 (CANL) - H44-16 (BAT)
      A71-2 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Transmission control ECU assembly
      A71-8 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to ECU or sensor) B

    A

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

    B

    GO TO STEP 17 Click here

  14. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 3 JUNCTION CONNECTOR)


    1. Disconnect the H142 CAN No. 3 junction connector.

    2. B001MPEC07
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to CAN No. 2 Junction Connector
      *c to Combination Meter Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      H142-5 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher CAN No. 2 Junction Connector
      H142-11 (CANL) - H44-16 (BAT)
      H142-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Combination meter assembly
      H142-12 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to CAN No. 2 junction connector) B
      NG (Line to ECU or sensor) C

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - CAN NO. 3 JUNCTION CONNECTOR)

    C

    GO TO STEP 17 Click here

    A

  15. CHECK FOR SHORT TO +B IN CAN BUS LINE (CAN NO. 3 JUNCTION CONNECTOR)


    1. Disconnect the A72 CAN No. 3 junction connector.

    2. B001MPEC08
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Skid Control ECU (Brake Booster with Master Cylinder Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      A72-1 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Skid control ECU (brake booster with master cylinder assembly)
      A72-7 (CANL) - H44-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to ECU or sensor) B

    A

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

    B

    GO TO STEP 17 Click here

  16. CHECK FOR SHORT TO +B IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Disconnect the H188 central gateway ECU (network gateway ECU) connector.

    2. B001MPJC79
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H188-18 (CA4H) - H188-1 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      H188-17 (CA4L) - H188-1 (BATT)
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

  17. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected.

      Click here

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

      B001L5OC37
      *1 DLC3 - -
      *a

      Component with harness connected

      (Central Gateway ECU (Network Gateway ECU))

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      H188-18 (CA4H) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      H188-17 (CA4L) - H44-16 (BAT)

      Tech Tips


      • If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.

      Result
      Result
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR