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 MAIN relay) and supplying power to terminal +B of the ECM.

WIRING DIAGRAM

A01XBUME01
A01XBUME03

PROCEDURE


  1. INSPECT INTEGRATION NO.1 RELAY (INTEGRATION RELAY - BODY GROUND)

    A01X4UXE01
    *a Front view of wire harness connector: (to Engine Room Relay Block)
    *b Integration Relay

    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
      Tester Connection Condition Specified Condition
      1C-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-3 - Body ground Always Below 1 Ω
      1B-7 - Body ground Always Below 1 Ω

    4. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT INTEGRATION NO.1 RELAY (EFI RELAY AND IG2 RELAY)

    A01X46SE01

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

    2. Inspect the EFI MAIN fuse and the IG2 MAIN fuse.


      1. Remove the EFI MAIN fuse and IG2 MAIN fuse from the integration relay.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        EFI MAIN fuse Always Below 1 Ω
        IG2 MAIN fuse Always Below 1 Ω

    3. Inspect the EFI relay and the IG2 relay.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1C-1 - 1B-4 Battery voltage not applied to terminals 1B-2 and 1B-3 10 kΩ or higher
        Battery voltage applied to terminals 1B-2 and 1B-3 Below 1 Ω
        1C-1 - 1B-8 Battery voltage not applied to terminals 1B-7 and 1B-6 10 kΩ or higher
        Battery voltage applied to terminals 1B-7 and 1B-6 Below 1 Ω

    NG

    REPLACE INTEGRATION RELAY

    OK

  3. 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

    NG

    CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM) Click here

    OK

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

    A01X8SHE03

    1. Check the harness and the connectors between the integration relay and the ECM.

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

    3. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      for LHD
      Tester Connection Condition Specified Condition
      A38-44 (MREL) - 1B-2 Always Below 1 Ω
      A38-2 (+B) - 1B-4 Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A52-44 (MREL) - 1B-2 Always Below 1 Ω
      A52-2 (+B) - 1B-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      A38-44 (MREL) or 1B-2 - Body ground Always 10 kΩ or higher
      A38-2 (+B) or 1B-4 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A52-44 (MREL) or 1B-2 - Body ground Always 10 kΩ or higher
      A52-2 (+B) or 1B-4 - Body ground Always 10 kΩ or higher

    5. Reconnect the ECM connector.

    6. Reinstall the integration relay.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    A01X8SHE04

    1. Check the harness and the connectors between the integration relay and the ECM.

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

    3. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      for LHD
      Tester Connection Condition Specified Condition
      A38-28 (IGSW) - 1B-8 Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A52-28 (IGSW) - 1B-8 Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      A38-28 (IGSW) or 1B-8 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A52-28 (IGSW) or 1B-8 - Body ground Always 10 kΩ or higher

    5. Reconnect the ECM connector.

    6. Reinstall the integration relay.

      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 OR STARTER SWITCH ASSEMBLY - INTEGRATION RELAY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY)

    A01X927E01
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Front view of wire harness connector: (to Engine Room Relay Block)
    *3 Integration Relay

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

    2. Disconnect the IG2D main body ECU connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E2-11 (IG2D) - 1B-6 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E2-11 (IG2D) or 1B-6 - Body ground Always 10 kΩ or higher

    OK

    CHECK ENTRY AND START SYSTEM

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - INTEGRATION RELAY)


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

    2. Disconnect the Ignition or Starter Switch Assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E93-6 (IG2) - 1B-6 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E93-6 (IG2) or 1B-6 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY


    1. Inspect the Ignition or Starter Switch Assembly Click here.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY