CAN COMMUNICATION SYSTEM ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode Applies to "ECM Communication Stop Mode" in "DTC combination table"

  • Power source circuit of ECM

  • ECM main wire or connector

  • ECM

WIRING DIAGRAM

A0137SHE01
A0136OAE01

INSPECTION PROCEDURE

Note


  • Turn the ignition switch to OFF before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned to OFF, check that the light reminder warning system is not in operation.

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

    Tech Tips

    Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check the engine type.

      Result
      Engine Type Proceed to
      1KR-FE Engine A
      2WZ-TV Engine B

    B

    CHECK CAN BUS LINE FOR DISCONNECTION (ECM MAIN WIRE) Click here

    A

  2. CHECK CAN BUS LINE FOR DISCONNECTION (ECM MAIN WIRE)


    1. A0137U9E01

      Turn the ignition switch to OFF.

    2. Disconnect the B25 ECM connector.

    3. Measure the resistance according to the value in the table below.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      B25-64 (CAN+) - B25-45 (CAN-) ignition switch OFF 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CAN-H, CAN-L)

    OK

  3. CHECK HARNESS AND CONNECTOR (IGSW, E1)


    1. A0137VCE01

      Disconnect the B25 and B26 ECM connectors.

    2. Measure the resistance according to the value in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      B26-24 (E1) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      B25-47 (IGSW) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM

  4. CHECK CAN BUS LINE FOR DISCONNECTION (ECM MAIN WIRE)


    1. A0138R2E01

      Turn the ignition switch to OFF.

    2. Disconnect the A36 or A35 ECM connector.

    3. Measure the resistance according to the value in the table below.

      Standard resistance
      for RHD:
      Tester Connection Switch Condition Specified Condition
      A36-4 (CANH) - A36-3 (CANL) ignition switch OFF 108 to 132 Ω
      for LHD:
      Tester Connection Switch Condition Specified Condition
      A35-4 (CANH) - A35-3 (CANL) ignition switch OFF 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CAN-H, CAN- L)

    OK

  5. CHECK HARNESS AND CONNECTOR (VBK, E1, E2)


    1. A0136AVE01

      Disconnect the A36 or A35 and B53, B54 ECM connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      B53-38 (E1) - Body ground Always Below 1 Ω
      B54-12 (E2) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value in the table below.

      Standard voltage
      for RHD:
      Tester Connection Switch Condition Specified Condition
      A36-11 (VBK) - Body ground Ignition switch ON 11 to 14 V
      for LHD:
      Tester Connection Switch Condition Specified Condition
      A35-11 (VBK) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM