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SFI SYSTEM (w/ EGR System) ECM Power Source Circuit

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DTC Code DTC Name
  ECM Power Source Circuit
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DESCRIPTION

When the power switch is turned on (IG), auxiliary battery voltage is applied to IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the No. 2 integration relay (EFI MAIN relay) and supplying power to either terminal +B and +B2 of the ECM.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

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

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PROCEDURE


  1. Click here

    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
      Tester Connection Condition Specified Condition
      D27-104 (E1) - Body ground Always Below 1 Ω

  2. Click here

    INSPECT ECM (IGSW VOLTAGE)


    1. A003Y98E72

      Disconnect the ECM connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A60-28 (IGSW) - Body ground Power switch on (IG) 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

  3. Click here

    INSPECT NO. 2 INTEGRATION RELAY (EFI MAIN RELAY)


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


  4. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - ECM)


    1. Remove the No. 2 integration relay (EFI MAIN relay) from the engine room relay block.

    2. Disconnect the No. 2 integration relay connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-4 - A60-1 (+B2) Always Below 1 Ω
      1B-4 - A60-2 (+B) Always Below 1 Ω
      1B-2 - A60-6 (MREL) Always Below 1 Ω
      1B-4 or A60-1 (+B2) - Body ground Always 10 kΩ or higher
      1B-4 or A60-2 (+B) - Body ground Always 10 kΩ or higher
      1B-2 or A60-6 (MREL) - Body ground Always 10 kΩ or higher

  5. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - AUXILIARY BATTERY)


    1. Remove the No. 2 integration relay (EFI MAIN relay) from the engine room relay block.

    2. Disconnect the No. 2 integration relay connector.

    3. Disconnect the negative (-) auxiliary battery terminal.

    4. Disconnect the positive (+) auxiliary battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1C-1 - Positive (+) auxiliary battery terminal Always Below 1 Ω
      1C-1 or Positive (+) auxiliary battery terminal - Body ground Always 10 kΩ or higher

  6. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - BODY GROUND)


    1. Remove the No. 2 integration relay (EFI MAIN relay) from the engine room relay block.

    2. Disconnect the No. 2 integration relay connector.

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

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

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    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  8. Click here

    INSPECT NO. 2 INTEGRATION RELAY (IG2 RELAY)


    1. Inspect the No. 2 integration relay (IG2 relay) (Click here).


  9. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - ECM)


    1. Disconnect the ECM connector.

    2. Remove the No. 2 integration relay (IG2 relay) from the engine room relay block.

    3. Disconnect the No. 2 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-4 - A60-28 (IGSW) Always Below 1 Ω
      1A-4 or A60-28 (IGSW) - Body ground Always 10 kΩ or higher

  10. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - AUXILIARY BATTERY)


    1. Remove the No. 2 integration relay (IG2 relay) from the engine room relay block.

    2. Disconnect the No. 2 integration relay connector.

    3. Disconnect the negative (-) auxiliary battery terminal.

    4. Disconnect the positive (+) auxiliary battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1C-1 - Positive (+) auxiliary battery terminal Always Below 1 Ω
      1C-1 or Positive (+) auxiliary battery terminal - Body ground Always 10 kΩ or higher

  11. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - BODY GROUND)


    1. Remove the No. 2 integration relay (IG2 relay) from the engine room relay block.

    2. Disconnect the No. 2 integration relay connector.

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

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

  12. Click here

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INTEGRATION RELAY (IG2 RELAY))


    1. Remove the No. 2 integration relay (IG2 relay) from the engine room relay block.

    2. Disconnect the No. 2 integration relay connector.

    3. Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A20-2 (IG2D) - 1A-2 Always Below 1 Ω

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    CHECK ENTRY AND START SYSTEM (FOR START FUNCTION)Click here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. Click here

    REPLACE NO. 2 INTEGRATION RELAYClick here

  16. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. Click here

    REPLACE NO. 2 INTEGRATION RELAY (IG2 RELAY)Click here

  20. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  23. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR