ECD SYSTEM (w/ DPF) ECM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), 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 EFI relay and supplying power to terminal +B of the ECM.

WIRING DIAGRAM

A00OANSE01

INSPECTION PROCEDURE

Note


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

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

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

PROCEDURE


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


    1. A00O4NZE02
      *1 Engine Room Relay Block
      *a

      Front view of wire harness connector

      (to No. 1 Integration Relay)

      Remove the No. 1 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. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT NO. 1 INTEGRATION RELAY (EFI, EFI MAIN, IG2)


    1. Inspect the No. 1 integration relay (EFI) Click here.

    2. Inspect the No. 1 integration relay (EFI MAIN) Click here.

    3. Inspect the No. 1 integration relay (IG2) Click here.


    NG

    REPLACE NO. 1 INTEGRATION RELAY

    OK

  3. INSPECT ECM (IGSW VOLTAGE)


    1. A00O7X2E24
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G58-24 (IGSW) - C93-1 (E1) Engine switch on (IG) 11 to 14 V

    NG

    CHECK WIRE HARNESS (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY) Click here

    OK

  4. CHECK WIRE HARNESS (NO. 1 INTEGRATION RELAY - ECM)


    1. Check the wire harness between the ECM and No. 1 integration relay.

    2. Disconnect the ECM connector.

    3. Remove the No. 1 integration relay from the engine room relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      G58-11 (MREL) - 1B-2 Always Below 1 Ω
      G57-24 (+B) - 1B-8 Always Below 1 Ω
      G57-17 (+B2) - 1B-8 Always Below 1 Ω
      G58-24 (IGSW) - 1A-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G58-11 (MREL) or 1B-2 - Body ground Always 10 kΩ or higher
      G57-24 (+B) or 1B-8 - Body ground Always 10 kΩ or higher
      G57-17 (+B2) or 1B-8 - Body ground Always 10 kΩ or higher
      G58-24 (IGSW) or 1A-5 - Body ground Always 10 kΩ or higher

    5. Reconnect the ECM connector.

    6. Reinstall the No. 1 integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. CHECK WIRE HARNESS (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)


    1. Remove the power management control ECU.

    2. Remove the No. 1 integration relay from the engine room relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      G50-8 (IG2D) - 1A-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G50-8 (IG2D) or 1A-1 - Body ground Always 10 kΩ or higher

    4. Reinstall the power management control ECU.

    5. Reinstall the No. 1 integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ENTRY AND START SYSTEM Click here