CAN COMMUNICATION SYSTEM (w/ VSC) ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

When either condition below is met:


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

  • "ECM Communication Stop Mode" in "DTC Combination Table" applies.


  • Power source or ECM

  • Harness or connector

  • ECM

WIRING DIAGRAM

A01DYDZE01
A01DWO3E01

INSPECTION PROCEDURE

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 HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. for 1KD-FTV, 2KD-FTV (w/ DPF):

      A01DY4CE01

      1. Disconnect the E25, E30 and E31 ECM connectors.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E31-24 (+B) - Body ground When battery's positive (+) voltage is applied to terminal E30-11 (MREL) 11 to 14 V
        E31-23 (BATT) - Body ground Always 11 to 14 V
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        E25-1 (E1) - Body ground Always Below 1 Ω
        E25-13 (E02) - Body ground Always Below 1 Ω
        E25-12 (E01) - Body ground Always Below 1 Ω
    2. for 1KD-FTV, 2KD-FTV (w/o DPF):

      A01E0FHE03

      1. Disconnect the E5, E6, E7 and E8 ECM connectors.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E5-1 (+B) - Body ground When battery's positive (+) voltage is applied to terminal E5-8 (MREL) 11 to 14 V
        E6-2 (BATT) - Body ground Always 11 to 14 V
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        E7-7 (E1) - Body ground Always Below 1 Ω
        E8-6 (E02) - Body ground Always Below 1 Ω
        E8-7 (E01) - Body ground Always Below 1 Ω
    3. for 1GR-FE:

      A01E0H6E01

      1. Disconnect the E14, E15 and E17 ECM connectors.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E14-1 (+B) - Body ground When battery's positive (+) voltage is applied to terminal E14-8 (MREL) 11 to 14 V
        E14-2 (+B2) - Body ground When battery's positive (+) voltage is applied to terminal E14-8 (MREL) 11 to 14 V
        E14-3 (BATT) - Body ground Always 11 to 14 V
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        E17-1 (E1) - Body ground Always Below 1 Ω
        E15-7 (E01) - Body ground Always Below 1 Ω
        E15-6 (E02) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for 1KD-FTV) A
      OK (for 2KD-FTV) B
      OK (for 1GR-FE) C
      NG D

    B
    C
    D
    A