CAN COMMUNICATION SYSTEM Check CAN Bus Line for Short to GND (LHD Models)

DESCRIPTION

There may be a short circuit between one of the CAN bus wires and GND when there is no resistance between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of the DLC3.

Symptom Trouble Area
No resistance exists between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of DLC3.

  • Short to GND in CAN bus main wire

  • Short to GND in CAN bus branch wire

  • Combination meter

  • Yaw rate and acceleration sensor

  • Power steering ECU

  • Center airbag sensor assembly

  • Steering angle sensor

  • Air conditioning amplifier

  • Brake actuator (Skid control ECU)

  • Main body ECU (Driver side junction block)

  • ECM

  • CAN junction connector CTR

  • CAN No. 1 junction connector RH

  • CAN No. 2 junction connector

  • CAN No. 3 junction connector

  • CAN No. 5 junction connector

  • CAN No. 6 junction connector

  • AFS ECU

  • Navigation ECU sub-assembly*1

Tech Tips

*1: w/ Navigation system

WIRING DIAGRAM

Refer to Check CAN Bus Lines for Short Circuit Click here.

INSPECTION PROCEDURE

Note


  • Turn the engine switch off before measuring the resistances of the CAN main wires and the CAN branch wires.

  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR SHORT TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)


    1. Turn the engine switch off.

    2. A01CEPAE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

    3. A01CEZIE02
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G8-6 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G8-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

    OK

  2. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 3 J/C)


    1. A01CD0ME69
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-5 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G56-16 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 3 J/C) Click here

    OK

  3. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 6 J/C)


    1. A01CD0ME70
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-1 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G56-12 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 6 J/C) Click here

    OK

  4. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - MAIN BODY ECU)


    1. A01CD0ME71
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-3 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G56-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (MAIN BODY ECU) Click here

    OK

  5. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - POWER STEERING ECU)


    1. A01CD0ME72
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-4 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G56-15 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (POWER STEERING ECU) Click here

    OK

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

  6. CHECK FOR SHORT TO GND IN CAN BUS WIRE (MAIN BODY ECU)


    1. A01CGFNE13
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the connector of the main body ECU.

    2. A01CD0ME71
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-3 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G56-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - MAIN BODY ECU)

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK) Click here

  7. CHECK FOR SHORT TO GND IN CAN BUS WIRE (POWER STEERING ECU)


    1. A01CF3FE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the connector of the power steering ECU.

    2. A01CD0ME72
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-4 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G56-15 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - POWER STEERING ECU)

    OK

    REPLACE POWER STEERING ECU Click here

  8. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 6 J/C)


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

    2. A01CDBRE11
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)

      Disconnect the connector of the CAN No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-3 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      A44-5 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 6 J/C)

    OK

  9. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 6 J/C - ECM)


    1. A01CDBRE12
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-1 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      A44-6 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM) Click here

    OK

  10. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 6 J/C - SKID CONTROL ECU)


    1. A01CDBRE13
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-2 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      A44-4 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU) Click here

    OK

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  11. CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)


    1. A01CD8TE66
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the connector of the ECM .

    2. A01CDBRE12
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-1 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      A44-6 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (2AZ-FE) A
      OK (2GR-FE) B
      NG C

    B

    REPLACE ECM (for 2GR-FE) Click here

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - ECM)

    A

    REPLACE ECM (for 2AZ-FE) Click here

  12. CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU)


    1. A01CFJZE88
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

      Disconnect the connector of the skid control ECU.

    2. A01CDBRE13
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-2 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      A44-4 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 6 J/C - SKID CONTROL ECU)

    OK

    REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) Click here

  13. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 3 J/C)


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

    2. A01CD0ME73
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)

      Disconnect the connector of the CAN No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F10-9 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      F10-20 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 3 J/C)

    OK

  14. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 3 J/C - CAN J/C CTR)


    1. A01CD0ME74
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F10-8 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      F10-19 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (w/ Navigation system) A
      OK (w/o Navigation system) B
      NG C

    B

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

    C

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 3 J/C - CAN J/C CTR) Click here

    A

  15. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 3 J/C - NAVIGATION ECU)


    1. A01CD0ME75
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F10-11 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      F10-22 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (NAVIGATION ECU) Click here

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  16. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NAVIGATION ECU)


    1. A01CE2ZE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/o Front Center Speaker))
      *b

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/ Front Center Speaker))

      Disconnect the connector of the navigation ECU.

    2. A01CD0ME75
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-11 (CANH) - G8-4 (CG) Engine switch off 200 kΩ or higher
      F10-22 (CANL) - G8-4 (CG) Engine switch off 200 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 3 J/C - NAVIGATION ECU)

    OK

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

  17. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 3 J/C - CAN J/C CTR)


    1. Reconnect the connector of the CAN No. 3 junction connector.

    2. A01CDVFE06
      Text in Illustration
      *1 DLC3
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector CTR)

      Disconnect the CAN main wire connector (G61) from the CAN junction connector CTR (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G61-1 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G61-2 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 J/C - CAN J/C CTR)

    OK

  18. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN J/C CTR - COMBINATION METER)


    1. Reconnect the CAN main wire connector (G61) to the CAN junction connector CTR (w/o earth terminal).

    2. A01CDQOE06
      Text in Illustration
      *1 DLC3
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector CTR)

      Disconnect the CAN main wire connector (G62) from the CAN junction connector CTR (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G62-1 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G62-2 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN J/C CTR - CAN NO. 1 J/C RH) Click here

    OK

  19. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN J/C CTR)


    1. Reconnect the CAN main wire connector (G62) to the CAN junction connector CTR (w/o earth terminal).

    2. A01CEZIE02
      Text in Illustration
      *1 DLC3

      Connect the probes of an ohmmeter to terminals CANH and CANL of the DLC3.

    3. While observing the resistance value shown on the tester, disconnect connectors (G63 and G90) from the CAN junction connector CTR one by one until the resistance becomes normal (200 Ω or higher).

      Tech Tips

      Disconnect the branch wire connectors other than those of the DLC3.

      A01CGFQE02
      for CAN Junction Connector B Side
      Terminal No. (Symbol) Wiring Color Connected to
      G61-1 (CANH) R CAN No. 3 junction connector
      G61-2 (CANL) W
      G62-1 (CANH) SB CAN No. 1 junction connector RH
      G62-2 (CANL) W
      G63-1 (CANH) Y Center airbag sensor assembly
      G63-2 (CANL) W
      G90-1 (CANH) BR Steering angle sensor
      G90-2 (CANL) W
      Text in Illustration
      *1 CAN Junction Connector CTR - -
      *a Junction Connector B Side *b Junction Connector A Side
      *c

      Front view of wire harness connector

      (to CAN Junction Connector CTR)

      		 *d Earth Terminal

      Note

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short to GND in 2 or more branch wires.

      Result
      Result Proceed to
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector. (There is no short to GND in the branch wires.) A
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector. (There is a short to GND in one of the areas related to one or more of the disconnected branch wires.) B

    4. When there is a short to GND in one or more of the branch wires:


      1. Reconnect all of the connectors to the CAN junction connector, except for the one that was disconnected last (the bus wire that is shorted to GND). Check that the resistance shown on the tester becomes normal (200 Ω or higher) to confirm that there is a short to GND in only one branch wire.

        Tech Tips


        • The shape of connectors connected to the CAN junction connector which has an earth terminal is the same. The connectors connected to the CAN junction connector can be distinguished by the colors of the bus wire and the connecting side of the junction connector.

        • Reconnecting the connectors to non-specified positions on the CAN junction connector does not affect system operation. However, it is preferred to reconnect the connectors to their specified positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


    B

    CHECK FOR SHORT TO GND IN CAN BUS WIRE Click here

    A

    REPLACE CAN JUNCTION CONNECTOR CTR

  20. CHECK FOR SHORT TO GND IN CAN BUS WIRE


    1. Reconnect the connector for the bus wire that is shorted to GND to the CAN junction connector (the connector that caused the bus wire resistance to change to 200 Ω or higher when it was disconnected).

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

    3. A01CEZIE02
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G8-6 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G8-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

      Tech Tips

      If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short to GND in the ECU or sensor.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  21. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN J/C CTR - CAN NO. 1 J/C RH)


    1. Reconnect the CAN main wire connector (G62) to the CAN junction connector CTR (w/o earth terminal).

    2. A01CFC1E19
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 1 Junction Connector RH)

      Disconnect the CAN main wire connector (G67) from the CAN No. 1 junction connector RH (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

    3. A01CEZIE02
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G8-6 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G8-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher
      Result
      Result Proceed to
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) is still below 200 Ω when the specified connector is disconnected from the CAN junction connector. (There is a short to GND in the bus wires.) A
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector. (There is a short to GND in the disconnected bus wires.) B

    B

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN J/C CTR - CAN NO. 1 J/C RH)

    A

  22. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C RH - COMBINATION METER)


    1. Reconnect the CAN main wire connector (G67) to the CAN No. 1 junction connector RH (w/o earth terminal).

    2. A01CFC1E20
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 1 Junction Connector RH)

      Disconnect the CAN main wire connector (G88) from the CAN No. 1 junction connector RH (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

    3. A01CEZIE02
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G8-6 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G8-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher
      Result
      Result Proceed to
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) is still below 200 Ω when the specified connector is disconnected from the CAN junction connector. (There is a short to GND in the bus wires.) A
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector. (There is a short to GND in the disconnected bus wires.) B

    B

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C RH - CAN NO. 5 J/C) Click here

    A

  23. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C RH)


    1. Reconnect the CAN main wire connector (G88) to the CAN No. 1 junction connector RH (w/o earth terminal).

    2. A01CEZIE02
      Text in Illustration
      *1 DLC3

      Connect the probes of an ohmmeter to terminals CANH and CANL of the DLC3.

    3. While observing the resistance value shown on the tester, disconnect connectors (G87 and G89) from the CAN No. 1 junction connector RH one by one until the resistance becomes normal (200 Ω or higher).

      Tech Tips

      Disconnect the branch wire connectors other than those of the DLC3.

      A01CEJ4E02
      for CAN Junction Connector B Side
      Terminal No. (Symbol) Wiring Color Connected to
      G67-1 (CANH) SB CAN junction connector CTR
      G67-2 (CANL) W
      G87-1 (CANH) R AFS ECU
      G87-2 (CANL) W
      G88-1 (CANH) Y CAN No. 5 junction connector
      G88-2 (CANL) W
      G89-1 (CANH) V Air conditioning amplifier
      G89-2 (CANL) W
      Text in Illustration
      *1 CAN No. 1 Junction Connector RH - -
      *a Junction Connector B Side *b Junction Connector A Side
      *c

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector RH)

      		 *d Earth Terminal

      Note

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short to GND in 2 or more branch wires.

      Result
      Result Proceed to
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector. (There is no short to GND in the branch wires.) A
      The resistance between terminals 6 (CANH) and 4 (CG), or the resistance between 14 (CANL) and 4 (CG) becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector. (There is a short to GND in one of the areas related to one or more of the disconnected branch wires.) B

    4. When there is a short to GND in one or more of the branch wires:


      1. Reconnect all of the connectors to the CAN junction connector, except for the one that was disconnected last (the bus wire that is shorted to GND). Check that the resistance shown on the tester becomes normal (200 Ω or higher) to confirm that there is a short to GND in only one branch wire.

        Tech Tips


        • The shape of connectors connected to the CAN junction connector which has an earth terminal is the same. The connectors connected to the CAN junction connector can be distinguished by the colors of the bus wire and the connecting side of the junction connector.

        • Reconnecting the connectors to non-specified positions on the CAN junction connector does not affect system operation. However, it is preferred to reconnect the connectors to their specified positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


    B

    CHECK FOR SHORT TO GND IN CAN BUS WIRE Click here

    A

    REPLACE CAN NO. 1 JUNCTION CONNECTOR RH

  24. CHECK FOR SHORT TO GND IN CAN BUS WIRE


    1. Reconnect the connector for the bus wire that is shorted to GND to the CAN junction connector (the connector that caused the bus wire resistance to change to 200 Ω or higher when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus wire shorted to GND is connected.

    3. A01CEZIE02
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G8-6 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      G8-14 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

      Tech Tips

      If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU, there may be a short to GND in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU

  25. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C RH - CAN NO. 5 J/C)


    1. Reconnect the CAN main wire connector (G88) to the CAN No. 1 junction connector RH (w/o earth terminal).

    2. A01CB2XE04
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

      Disconnect the connector of the CAN No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-6 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      M22-17 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C RH - CAN NO. 5 J/C)

    OK

  26. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 5 J/C - COMBINATION METER)


    1. A01CB2XE05
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-7 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      M22-18 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (COMBINATION METER) Click here

    OK

  27. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 5 J/C - YAW RATE AND ACCELERATION SENSOR)


    1. A01CB2XE06
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-5 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      M22-16 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (YAW RATE AND ACCELERATION SENSOR) Click here

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  28. CHECK FOR SHORT TO GND IN CAN BUS WIRE (YAW RATE AND ACCELERATION SENSOR)


    1. A01CBZBE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor)

      Disconnect the connector of the yaw rate and acceleration sensor.

    2. A01CB2XE06
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-5 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      M22-16 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 5 J/C - YAW RATE AND ACCELERATION SENSOR)

    OK

    REPLACE YAW RATE AND ACCELERATION SENSOR Click here

  29. CHECK FOR SHORT TO GND IN CAN BUS WIRE (COMBINATION METER)


    1. A01CD9PE97
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter)

      Disconnect the connector of the combination meter.

    2. A01CB2XE05
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-7 (CANH) - G8-4 (CG) Engine switch off 200 Ω or higher
      M22-18 (CANL) - G8-4 (CG) Engine switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 5 J/C - COMBINATION METER)

    OK

    REPLACE COMBINATION METER Click here