CAN COMMUNICATION SYSTEM(for LHD with Entry and Start System) ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

Either condition is met:


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

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

  • Power source or inside ECM

  • ECM

WIRING DIAGRAM

A01XHR1E02
for 1GR-FE and Manual Transmission System
*1 from Battery
*2 from EFI Relay
*3 to EFI Relay
A01XHR1E03
for 1GR-FE and Automatic Transmission System
*a from Battery
*b from EFI Relay
*c to EFI Relay
A01XCU0E01
for 1KD-FTV
*a from Battery
*b from EFI Relay
*c to EFI Relay
A01XGH2E02
A01XKCYE02
for 2TR-FE
*a from Battery
*b from EFI Relay
*c to EFI Relay

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


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


    1. for 1GR-FE and Manual Transmission System:


      1. Disconnect the C36, C37 and G55 ECM connectors.

        B001DI3E04
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C36-12 (E1) - Body ground Always Below 1 Ω
        C37-14 (E01) - Body ground Always Below 1 Ω
        C37-15 (E02) - Body ground Always Below 1 Ω
        C37-10 (ME01) - Body ground Always Below 1 Ω
        G55-12 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G55-24 (BATT) - Body ground Always 11 to 14 V
        G55-23 (+B2) - Body ground Battery positive (+) voltage applied to terminal G55-9 (MREL) 11 to 14 V
        G55-22 (+B) - Body ground Battery positive (+) voltage applied to terminal G55-9 (MREL) 11 to 14 V

    2. for 1GR-FE and Automatic Transmission System:


      1. Disconnect the C36, C37, G55 and G56 ECM connectors.

        A01XHNGE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C36-12 (E1) - Body ground Always Below 1 Ω
        C36-23 (E01) - Body ground Always Below 1 Ω
        C37-14 (E02) - Body ground Always Below 1 Ω
        C36-29 (ME01) - Body ground Always Below 1 Ω
        G55-3 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G55-24 (BATT) - Body ground Always 11 to 14 V
        G55-22 (+B2) - Body ground Battery positive (+) voltage applied to terminal G56-36 (MREL) 11 to 14 V
        G55-23 (+B) - Body ground Battery positive (+) voltage applied to terminal G56-36 (MREL) 11 to 14 V

    3. for 1KD-FTV:


      1. Disconnect the C93, G57 and G58 ECM connectors.

        B001FNFE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C93-1 (E1) - Body ground Always Below 1 Ω
        C93-12 (E01) - Body ground Always Below 1 Ω
        C93-13 (E02) - Body ground Always Below 1 Ω
        C93-8 (ME01) - Body ground Always Below 1 Ω
        G57-11 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G57-23 (BATT) - Body ground Always 11 to 14 V
        G57-17 (+B2) - Body ground Battery positive (+) voltage applied to terminal G58-11 (MREL) 11 to 14 V
        G57-24 (+B) - Body ground Battery positive (+) voltage applied to terminal G58-11 (MREL) 11 to 14 V

    4. for 1GD-FTV:


      1. Disconnect the C151, C152, G184 and G185 ECM connectors.

        A01XCQDE03
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C152-1 (E1) - Body ground Always Below 1 Ω
        C151-3 (E01) - Body ground Always Below 1 Ω
        C152-4 (E02) - Body ground Always Below 1 Ω
        C152-3 (ME01) - Body ground Always Below 1 Ω
        G185-8 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G185-1 (BATT) - Body ground Always 11 to 14 V
        G185-2 (+B) - Body ground Battery positive (+) voltage applied to terminal G184-14 (MREL) 11 to 14 V
        G185-3 (+B2) - Body ground Battery positive (+) voltage applied to terminal G184-14 (MREL) 11 to 14 V
        G185-4 (+B3) - Body ground Battery positive (+) voltage applied to terminal G184-14 (MREL) 11 to 14 V

    5. for 2TR-FE:


      1. Disconnect the C153, G180 and C181 ECM connectors.

        A01XCTWE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C153-3 (E1) - Body ground Always Below 1 Ω
        C153-1 (E01) - Body ground Always Below 1 Ω
        C153-2 (E02) - Body ground Always Below 1 Ω
        C153-4 (ME01) - Body ground Always Below 1 Ω
        G180-18 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G180-3 (BATT) - Body ground Always 11 to 14 V
        G180-1 (+B) - Body ground Battery positive (+) voltage applied to terminal G181-6 (MREL) 11 to 14 V
        G180-2 (+B2) - Body ground Battery positive (+) voltage applied to terminal G181-6 (MREL) 11 to 14 V
      Result
      Result Proceed to
      OK (for 1GR-FE) A
      OK (for 1KD-FTV) B
      OK (for 2TR-FE) C
      OK (for 1GD-FTV) D
      NG E

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPAIR OR REPLACE HARNESS OR CONNECTOR