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

DESCRIPTION

There may be a short circuit between the CAN bus main wire 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

  • ECM

  • Certification ECU (Smart key ECU)

  • Combination meter

  • Power steering ECU

  • Center airbag sensor assembly

  • Skid control ECU

  • Steering angle sensor

  • Yaw rate sensor

  • Main body ECU (Multiplex network body ECU)

  • Power management control ECU

  • Multi-media module receiver assembly

  • CAN No. 1 junction connector

  • CAN No. 2 junction connector

*1: w/ Navigation system

WIRING DIAGRAM

A01NI38E02
A01NKMDE02

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

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

Tech Tips


  • Operating the power 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 may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - CAN NO. 2 J/C)


    1. Turn the power switch off.

    2. A01NIZEE62

      Disconnect the CAN No. 1 junction connector.

    3. A01NLIJE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to CAN No. 2 Junction Connector
      *3 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F17-14 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C) Click here

    OK

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


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

      A01NNEGE78
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F70-5 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Main body ECU
      F70-16 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-8 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Multi-media module receiver assembly*1
      F70-19 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-9 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Power management control ECU
      F70-20 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

      *1: w/ Navigation system

      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)

      		 *2 DLC3
      *3 to Main Body ECU *4 to Multi-media Module Receiver Assembly*1
      *5 to Power Management Control ECU - -

      *1: w/ Navigation system

      Result
      Result Proceed to
      OK A
      NG (Main body ECU branch wire) B
      NG (Multi-media module receiver assembly branch wire)*1 C
      NG (Power management control ECU main wire) D

      *1: w/ Navigation system


    B

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

    C

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    D

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU) Click here

    A

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


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

      A01NNEGE79
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F70-10 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Center airbag sensor assembly
      F70-21 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-11 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Yaw rate sensor
      F70-22 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)

      		 *2 DLC3
      *3 to Center Airbag Sensor Assembly *4 to Yaw Rate Sensor
      Result
      Result Proceed to
      OK A
      NG (Center airbag sensor assembly branch wire) B
      NG (Yaw rate sensor branch wire) C

    B

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY) Click here

    C

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

    A

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  4. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)


    1. A01NIZEE74

      Disconnect the CAN No. 2 junction connector.

    2. A01NLIJE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to CAN No. 1 Junction Connector
      *3 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F17-14 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPAIR CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 1 J/C)

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


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

      A01NNEGE99
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F71-1 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Skid control ECU
      F71-12 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-2 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Certification ECU
      F71-13 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-3 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher DLC3
      F71-14 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

      		 *2 DLC3
      *3 to Skid Control ECU *4 to Certification ECU
      *5 to DLC3 - -
      Result
      Result Proceed to
      OK A
      NG (Skid Control ECU branch wire) B
      NG (Certification ECU branch wire) C
      NG(DLC3 branch wire) D

    B

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

    C

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

    D

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN NO. 2 J/C - DLC3)

    A

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


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

      A01NNEGE80
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F71-4 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Combination meter
      F71-15 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-5 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Steering angle sensor
      F71-16 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-6 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher Power steering ECU
      F71-17 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-8 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher ECM
      F71-19 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)

      		 *2 DLC3
      *3 to Combination Meter *4 to Steering Angle Sensor
      *5 to Power Steering ECU *6 to ECM
      Result
      Result Proceed to
      OK A
      NG (Combination meter branch wire) B
      NG (Steering angle sensor branch wire) C
      NG (Power steering ECU branch wire) D
      NG (ECM main wire) E

    B

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

    C

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

    D

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

    E

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

    A

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

  7. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - MAIN BODY ECU)


    1. A01NNCIE01

      Disconnect the main body ECU connector.

    2. A01NLRJE70
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 DLC3
      *4 to Main Body ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-5 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-16 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - MAIN BODY ECU)

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  8. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)


    1. A01NKJHE01

      Disconnect the power management control ECU connector.

    2. A01NLRJE72
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 DLC3
      *4 to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-9 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-20 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  9. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A01NI8YE16

      Disconnect the multi-media module receiver assembly connector.

    2. A01NLRJE94
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 DLC3
      *4 to Multi-media Module Receiver Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-8 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-19 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  10. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A01NJEQE11

      Disconnect the center airbag sensor assembly connector.

    2. A01NLRJE73
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 DLC3
      *4 to Center Airbag Sensor Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-10 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-21 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  11. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - YAW RATE SENSOR)


    1. A01NKYUE11

      Disconnect the yaw rate sensor connector.

    2. A01NLRJE74
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Yaw Rate Sensor)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 DLC3
      *4 to Yaw Rate Sensor

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-11 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F70-22 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - YAW RATE SENSOR)

    OK

    REPLACE YAW RATE AND ACCELERATION SENSOR Click here

  12. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - SKID CONTROL ECU)


    1. A01NJECE09

      Disconnect the skid control ECU connector.

    2. A01NLRJE75
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 DLC3
      *4 to Skid Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-1 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-12 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE SKID CONTROL ECU Click here

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


    1. A01NJPAE06

      Disconnect the certification ECU connector.

    2. A01NLRJE76
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 DLC3
      *4 to Certification ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-2 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-13 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - CERTIFICATION ECU)

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU)

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


    1. A01NISRE03

      Disconnect the combination meter connector.

    2. A01NLRJE95
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 DLC3
      *4 to Combination Meter

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-4 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-15 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - COMBINATION METER)

    OK

    REPLACE COMBINATION METER Click here

  15. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - STEERING ANGLE SENSOR)


    1. A01NJLYE27

      Disconnect the steering angle sensor connector.

    2. A01NLRJE96
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Angle Sensor)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 DLC3
      *4 to Steering Angle Sensor

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-5 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-16 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE SPIRAL CABLE WITH STEERING ANGLE SENSOR Click here

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


    1. A01NMPDE15

      Disconnect the power steering ECU connector.

    2. A01NLRJE97
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 DLC3
      *4 to Power Steering ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-6 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-17 (CANL) - F17-4 (CG) Power 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

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


    1. A01NM3YE07

      Disconnect the ECM connector.

    2. A01NJAKE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 DLC3
      *4 to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-8 (CANH) - F17-4 (CG) Power switch off 200 Ω or higher
      F71-19 (CANL) - F17-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE ECM Click here