ECD SYSTEM (w/o 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

A01KI3CE02

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. A01KEPEE07
      Text in Illustration
      *1 ECM Connector

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E7-1 (+B) - E5-7 (E1) 11 to 14 V

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

    NG

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


    1. A01KIQJE01
      Text in Illustration
      *1 ECM Connector

      Disconnect the E5 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      E5-7 (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. A01KEPEE08
      Text in Illustration
      *1 ECM Connector

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E7-9 (IGSW) - E5-7 (E1) 11 to 14 V

    OK

    INSPECT FUSE (EFI FUSE) Click here

    NG

  4. INSPECT IGNITION SWITCH ASSEMBLY


    1. A01KFFAE05
      Text in Illustration
      *1 Ignition Switch Connector
      *a Component Side

      Disconnect the I15 ignition switch connector.

    2. Measure the resistance of the ignition switch.

      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 connector.


    NG

    REPLACE IGNITION SWITCH ASSEMBLY

    OK

  5. INSPECT ECM (MREL VOLTAGE)


    1. A01KEPEE09
      Text in Illustration
      *1 ECM Connector

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E7-8 (MREL) - E5-7 (E1) 11 to 14 V

    NG

    REPLACE ECM

    OK

  6. INSPECT FUSE (EFI FUSE)


    1. A01KES4E05
      Text in Illustration
      *1 R/B No. 2
      *2 EFI

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

    2. Measure the resistance of the fuse.

      Standard resistance
      Below 1 Ω

    3. Reinstall EFI 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. A01KEMJE03
      Text in Illustration
      *1 R/B No. 2
      *2 EFI MAIN Relay
      *3 ECM Connector

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

    2. Disconnect the E7 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      EFI MAIN relay terminal 3 - E7-1 (+B) Below 1 Ω
      EFI MAIN relay terminal 3 or E7-1 (+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)