ECD SYSTEM(w/o DPF) ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminal +B of the ECM.

WIRING DIAGRAM

A01X0YIE02

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

PROCEDURE


  1. INSPECT INTEGRATION RELAY (POWER SOURCE)

    A01XBBZE03
    *a

    Front view of wire harness connector

    (Integration relay)
    *b for LHD
    *c for RHD

    1. Remove the integration relay from the engine room relay block.

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      1C-1 - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      1C-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)


    1. Remove the integration relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1S-4 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INTEGRATION RELAY (EFI MAIN NO. 1 AND IG2 MAIN)


    1. Inspect the integration relay Click here.


    NG

    REPLACE INTEGRATION RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)


    1. Remove the integration relay from the engine room relay block.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A38-44 (MREL) - 1S-8 Always Below 1 Ω
      A38-2 (+B) - 1S-11 Always Below 1 Ω
      A38-1 (+B2) - 1S-11 Always Below 1 Ω
      A38-44 (MREL) or 1S-8 - Body ground Always 10 kΩ or higher
      A38-2 (+B) or 1S-11 - Body ground Always 10 kΩ or higher
      A38-1 (+B2) or 1S-11 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A52-44 (MREL) - 1S-8 Always Below 1 Ω
      A52-2 (+B) - 1S-11 Always Below 1 Ω
      A52-1 (+B2) - 1S-11 Always Below 1 Ω
      A52-44 (MREL) or 1S-8 - Body ground Always 10 kΩ or higher
      A52-2 (+B) or 1S-11 - Body ground Always 10 kΩ or higher
      A52-1 (+B2) or 1S-11 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)


    1. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C45-81 (E1) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      C46-81 (E1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT ECM (IGSW VOLTAGE)

    A01X57OE01

    1. Disconnect the ECM connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      A38-28 (IGSW) - C45-81 (E1) Ignition switch ON 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      A52-28 (IGSW) - C46-81 (E1) Ignition switch ON 11 to 14 V

    OK

    REPLACE ECM Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)


    1. Disconnect the ECM connector.

    2. Remove the integration relay from the engine room relay block.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A38-28 (IGSW) - 1P-7 Always Below 1 Ω
      A38-28 (IGSW) or 1P-7 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A52-28 (IGSW) - 1P-7 Always Below 1 Ω
      A52-28 (IGSW) or 1P-7 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Entry and Start System) A
      OK (w/o Entry and Start System) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - INTEGRATION RELAY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  8. CHECK HARNESS AND CONNECTOR (SMART KEY ECU ASSEMBLY - INTEGRATION RELAY)


    1. Disconnect the smart key ECU assembly connector.

    2. Disconnect the integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E128-3 (IG1D) - 1R-2 Always Below 1 Ω
      E128-3 (IG1D) or 1R-2 - Body ground Always 10 kΩ or higher

    OK

    CHECK SMART KEY SYSTEM

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - INTEGRATION RELAY)


    1. Disconnect the ignition switch assembly connector.

    2. Disconnect the integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E93-6 (IG2) - 1R-2 Always Below 1 Ω
      E93-6 (IG2) or 1R-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY


    1. Inspect the ignition switch assembly Click here.


    OK

    GO TO PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY Click here