ECD SYSTEM (w/ EGR Cooler Bypass Valve) ECM Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01KGI6E01

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

PROCEDURE


  1. INSPECT ECM (+B VOLTAGE)


    1. A01KG1QE03
      Text in Illustration
      *1 ECM Connector

      Turn the ignition switch to ON.

    2. Measure the voltage of the E10 and E17 ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E17-24 (+B) - E10-1 (E1) 11 to 14 V

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

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


    1. A01KHWIE02
      Text in Illustration
      *1 ECM Connector

      Disconnect the E10 ECM connector.

    2. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      E10-1 (E1) - Body ground Below 1 Ω

    3. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (IGSW VOLTAGE)


    1. A01KG1QE04
      Text in Illustration
      *1 ECM Connector

      Turn the ignition switch to ON.

    2. Measure the voltage of the E10 and E16 ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E16-24 (IGSW) - E10-1 (E1) 11 to 14 V

    OK

    INSPECT FUSE (EFI FUSE) Click here

    NG

  4. INSPECT IGNITION SWITCH LOCK CYLINDER ASSEMBLY


    1. A01KFFAE07
      Text in Illustration
      *1 Ignition Switch Lock Cylinder Assembly
      *a Component Side

      Disconnect the I6 ignition switch lock cylinder assembly connector.

    2. Measure the resistance of the ignition switch lock cylinder assembly.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      5 (AM2) - 8 (IG2) LOCK 10 kΩ or higher
      5 (AM2) - 8 (IG2) ON Below 1 Ω

    3. Reconnect the ignition switch lock cylinder assembly connector.


    NG

    REPLACE IGNITION SWITCH LOCK CYLINDER ASSEMBLY Click here

    OK

  5. INSPECT ECM (MREL VOLTAGE)


    1. A01KEDSE18

      Turn the ignition switch to ON.

    2. Measure the voltage of the E10 and E16 ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E16-11 (MREL) - E10-1 (E1) 11 to 14 V

    NG

    REPLACE ECM Click here

    OK

  6. INSPECT FUSE (EFI FUSE)


    1. A01KICOE02
      Text in Illustration
      *1 R/B No. 2
      *2 ECD

      Remove the ECD fuse from the R/B No. 2.

    2. Measure the resistance of the fuse.

      Standard resistance
      Below 1 Ω

    3. Reinstall ECD fuse.


    NG

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

    OK

  7. INSPECT EFI MAIN RELAY


    1. A01KFAAE02

      Remove the EFI MAIN relay from the R/B No. 2.

    2. Inspect the EFI MAIN relay.

      Standard resistance
      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      Below 1 Ω (Apply battery voltage to terminals 1 and 2)

    3. Reinstall the EFI MAIN relay.


    NG

    REPLACE EFI MAIN RELAY

    OK

  8. CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY - ECM)


    1. Remove the EFI MAIN relay from the R/B No. 2.

    2. Disconnect the E17 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      EFI MAIN relay terminal 3 - E17-24 (+B) Below 1 Ω
      EFI MAIN relay terminal 3 or E17-24 (+B) - Body ground 10 kΩ or higher

    4. Reinstall the EFI MAIN relay.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+B TERMINAL OF ECM - BATTERY POSITIVE TERMINAL)