SFI SYSTEM(w/o Canister Pump Module) ECM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), the battery voltage is applied to IGSW of the ECM. When the transistor in the MREL circuit operates, current flows from the battery to ground through the drive circuit of the EFI-MAIN NO. 1 relay, thus operating the relay which supplies power to the +B, +B2, +B3 and +B4 terminals of the ECM.

WIRING DIAGRAM

B006AV6E02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. 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
      A95-9 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK TERMINAL VOLTAGE (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
      A95-8 (IGSW) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2 D RELAY) Click here

    OK

  3. INSPECT EFI-MAIN NO. 1 RELAY


    1. Inspect the EFI-MAIN NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE EFI-MAIN NO. 1 RELAY

    OK

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


    1. Disconnect the ECM connector.

    2. Remove the EFI-MAIN NO. 1 relay and EFI-MAIN NO. 3 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.

      Tech Tips

      Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays 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
      2 (EFI-MAIN NO. 1 relay) - A95-2 (MREL) Always Below 1 Ω
      5 (EFI-MAIN NO. 1 relay) - D2-12 (+B) Always Below 1 Ω
      5 (EFI-MAIN NO. 1 relay) - D2-11 (+B2) Always Below 1 Ω
      5 (EFI-MAIN NO. 1 relay) - D2-10 (+B3) Always Below 1 Ω
      5 (EFI-MAIN NO. 1 relay) - D2-9 (+B4) Always Below 1 Ω
      2 (EFI-MAIN NO. 1 relay) or A95-2 (MREL) - Body ground and other terminals Always 10 kΩ or higher
      5 (EFI-MAIN NO. 1 relay), D2-12 (+B), D2-11 (+B2), D2-10 (+B3) or D2-9 (+B4) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)


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

      B006A46C01
      *A for LHD *B for RHD
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly *2 EFI-MAIN NO. 1 Relay

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

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

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 1 RELAY)

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2 D RELAY)


    1. Inspect the IG2 D relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2 D RELAY)

    OK

  7. CHECK HARNESS AND CONNECTOR (IG2D RELAY - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5F-1 - A95-8 (IGSW) Always Below 1 Ω
      5F-1 or A95-8 (IGSW) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the instrument panel 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    OK

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


    1. Disconnect the instrument panel junction block assembly connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect the instrument panel junction block assembly connector.

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

      Standard Resistance (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
      Standard Resistance (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