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SFI SYSTEM(w/o Canister Pump Module) 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 the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the EFI-MAIN NO. 1 relay, closing the contacts and supplying power to terminals +B and +B2 of the ECM.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following 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
      D1-53 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. Click here

    CHECK HARNESS AND CONNECTOR (IGSW TERMINAL VOLTAGE)


    1. Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A56-4 (IGSW) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

  3. Click here

    INSPECT EFI MAIN NO. 1 RELAY


    1. Inspect the EFI MAIN NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK HARNESS AND CONNECTOR (ECM - EFI MAIN NO. 1 RELAY)


    1. Disconnect the ECM connector.

    2. Remove the EFI MAIN NO. 1 relay and A/F HTR relay from the No. 1 engine room relay block and junction block assembly.

    3. Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction block assembly.

      Tip:

      Remove the EFI-MAIN No. 2 relay and A/F HTR relay connected between the checked terminals as the coil inside the relay influences the measurement value.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A56-46 (MREL) - 1 (EFI MAIN NO. 1 relay) Always Below 1 Ω
      A56-2 (+B) - 3 (EFI MAIN NO. 1 relay) Always Below 1 Ω
      A56-3 (+B2) - 3 (EFI MAIN NO. 1 relay) Always Below 1 Ω
      A56-46 (MREL) or 1 (EFI MAIN NO. 1 relay) - Body ground and other terminals Always 10 kΩ or higher
      A56-2 (+B) or 3 (EFI MAIN NO. 1 relay) - Body ground and other terminals Always 10 kΩ or higher
      A56-3 (+B2) or 3 (EFI MAIN NO. 1 relay) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF EFI MAIN NO. 1 RELAY)


    1. B004VSTC01
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 EFI MAIN NO. 1 Relay

      Remove the EFI MAIN NO. 1 relay from the No. 1 engine room relay block and junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (EFI MAIN NO. 1 relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK HARNESS AND CONNECTOR (EFI MAIN NO.1 RELAY - BODY GROUND)


    1. Remove the EFI MAIN NO.1 relay from the No.1 engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (EFI MAIN NO.1 relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (IG2 D RELAY)


    1. Inspect the IG2 D relay.

      Click here

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY (IG2-MAIN RELAY)

  8. Click here

    CHECK HARNESS AND CONNECTOR (ECM - IG2 D RELAY)


    1. Disconnect the ECM connector.

    2. Disconnect the driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A56-4 (IGSW) - 5F-1 Always Below 1 Ω
      A56-4 (IGSW) or 5F-1 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF IG2 D RELAY)


    1. B004YQSC21
      *a

      Front view of wire harness connector

      (to Driver Side Junction Block Assembly)

      Disconnect the driver side junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5L-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    CHECK HARNESS AND CONNECTOR (IG2 D RELAY - BODY GROUND)


    1. Disconnect the driver side junction block assembly connector.

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

      Standard Resistance
      Table 1. for LHD
      Tester Connection Condition Specified Condition
      5D-6 - Body ground Always Below 1 Ω
      Table 2. for RHD
      Tester Connection Condition Specified Condition
      5D-7 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - IG2 D RELAY)


    1. Disconnect the certification ECU (smart key ECU assembly) connector.

    2. Disconnect the driver side junction block assembly connector.

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

      Standard Resistance
      Table 3. for LHD
      Tester Connection Condition Specified Condition
      G71-17 (IG1D) - 5D-18 Always Below 1 Ω
      G71-17 (IG1D) or 5D-18 - Body ground and other terminals Always 10 kΩ or higher
      Table 4. for RHD
      Tester Connection Condition Specified Condition
      G71-17 (IG1D) - 5D-19 Always Below 1 Ω
      G71-17 (IG1D) or 5D-19 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      GO TO ENTRY AND START SYSTEM (FOR START FUNCTION)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR