CAN COMMUNICATION SYSTEM(for RHD) ECM Communication Stop Mode

DTC Code DTC Name
ECM Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

ECM Communication Stop Mode

Either condition is met:

  • "ECM (Engine)" is not displayed on "CAN Bus Check".

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "ECM Communication Stop Mode" in "DTC Combination Table".

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  • Power source or inside ECM

  • ECM CAN main wire or connector

  • ECM

WIRING DIAGRAM

C299919E01
C299920E03
C299919E04

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.

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  • 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, 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 battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

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  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • DTC check procedure: Drive the vehicle for 50 seconds at a speed of 20 km/h (12 mph).

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

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Tip:

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

  • 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 OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE)

    1. C277468C01

      *A

      for 2AR-FE, 3ZR-FAE, 3ZR-FE

      *B

      for 1AD-FTV, 2AD-FHV, 2AD-CCo, 2AD-DPF

      *a

      Front view of wire harness connector

      (to ECM)

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

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Table 1. for 2AR-FE, 3ZR-FAE, 3ZR-FE

      Tester Connection

      Connector

      Specified Condition

      A62-13 (CANH) - A62-26 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω
      Table 2. for 1AD-FTV, 2AD-FHV, 2AD-CCo, 2AD-DPF

      Tester Connection

      Condition

      Specified Condition

      A61-7 (CANH) - A61-6 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE ECM CAN MAIN WIRE OR CONNECTOR (CANH, CANL)

    OK

  2. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)

    1. Connect the cable to the negative (-) battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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    2. for 2AR-FE:

      C229008C20

      *a

      Front view of wire harness connector

      (to ECM)

      -

      -

      1. Disconnect the ECM connector.

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

        Standard Voltage

        Tester Connection

        Condition

        Specified Condition

        A62-1 (BATT) - Body ground

        Always

        11 to 14 V

        A62-2 (+B) - Body ground

        Battery positive (+) voltage applied to terminal A62-46 (MREL)

        11 to 14 V

        A62-3 (+B2) - Body ground

        Battery positive (+) voltage applied to terminal A62-46 (MREL)

        11 to 14 V

        A62-37 (IGSW) - Body ground

        Ignition switch ON

        11 to 14 V

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        B77-16 (E1) - Body ground

        Always

        Below 1 Ω

        B77-49 (E02) - Body ground

        Always

        Below 1 Ω

        B77-50 (E01) - Body ground

        Always

        Below 1 Ω

        B77-58 (ME01) - Body ground

        Always

        Below 1 Ω

    3. for 3ZR-FAE, 3ZR-FE:

      C229008C24

      *a

      Front view of wire harness connector

      (to ECM)

      -

      -

      1. Disconnect the ECM connector.

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

        Standard Voltage

        Tester Connection

        Condition

        Specified Condition

        A62-1 (BATT) - Body ground

        Always

        11 to 14 V

        A62-2 (+B) - Body ground

        Battery positive (+) voltage applied to terminal A62-46 (MREL)

        11 to 14 V

        A62-3 (+B2) - Body ground

        Battery positive (+) voltage applied to terminal A62-46 (MREL)

        11 to 14 V

        A62-37 (IGSW) - Body ground

        Ignition switch ON

        11 to 14 V

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        B75-16 (E1) - Body ground

        Always

        Below 1 Ω

        B75-21 (E02) - Body ground

        Always

        Below 1 Ω

        B75-51 (E01) - Body ground

        Always

        Below 1 Ω

        B75-59 (ME01) - Body ground

        Always

        Below 1 Ω

    4. for 1AD-FTV, 2AD-FHV, 2AD-DPF, 2AD-CCO:

      C234869C04

      *a

      Front view of wire harness connector

      (to ECM)

      -

      -

      1. Disconnect the ECM connector.

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

        Standard Voltage

        Tester Connection

        Condition

        Specified Condition

        A61-2 (BATT) - Body ground

        Always

        11 to 14 V

        A61-1 (+B) - Body ground

        Battery positive (+) voltage applied to terminal A61-45 (MREL)

        11 to 14 V

        A61-20 (+B2) - Body ground

        Battery positive (+) voltage applied to terminal A61-45 (MREL)

        11 to 14 V

        A61-25 (IGSW) - Body ground

        Ignition switch ON

        11 to 14 V

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        B76-44 (E02) - Body ground

        Always

        Below 1 Ω

        B76-45 (E01) - Body ground

        Always

        Below 1 Ω

        B76-84 (ME01) - Body ground

        Always

        Below 1 Ω

        B76-109 (E1) - Body ground

        Always

        Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    for 2AR-FE:Click here

    for 3ZR-FAE:Click here

    for 3ZR-FE:Click here

    for 1AD-FTV:Click here

    for 2AD-FHV:Click here

    for 2AD-CCo, 2AD-DPF:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR