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

DESCRIPTION

When the engine switch is turned on (IG), 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 semiconductor pwr integration ECU (EFI MAIN1 relay), closing the contact and supplying power to terminals +B and +B2 of the ECM.

WIRING DIAGRAM

B003TPJE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT SEMICONDUCTOR PWR INTEGRATION ECU (POWER SOURCE)


    1. B003W7YC01
      *a

      Front view of wire harness connector

      (to Semiconductor Pwr Integration ECU)

      Disconnect the semiconductor pwr integration ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2B-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - SEMICONDUCTOR PWR INTEGRATION ECU)

    OK

  2. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BODY GROUND)


    1. Disconnect the semiconductor pwr integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-14 - Body ground Always Below 1 Ω
      2G-5 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SEMICONDUCTOR PWR INTEGRATION ECU (EFI MAIN, IG2 RELAY)


    1. Inspect the semiconductor pwr integration ECU (EFI MAIN, IG2 relay).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - ECM)


    1. Disconnect the semiconductor pwr integration ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A76-3 (MREL) - 2G-6 Always Below 1 Ω
      A77-2 (+B) - 2G-8 Always Below 1 Ω
      A77-1 (+B2) - 2G-7 Always Below 1 Ω
      A76-3 (MREL) or 2G-6 - Body ground Always 10 kΩ or higher
      A77-2 (+B) or 2G-8 - Body ground Always 10 kΩ or higher
      A77-1 (+B2) or 2G-7 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. 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
      F4-1 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT ECM (IGSW VOLTAGE)


    1. B003T25C04
      *a

      Component with harness connected

      (ECM)

      Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A76-8 (IGSW) - F4-1 (E1) Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (ECM - SEMICONDUCTOR PWR INTEGRATION ECU)


    1. Disconnect the semiconductor pwr integration ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A76-8 (IGSW) - 2F-4 Always Below 1 Ω
      A76-8 (IGSW) or 2F-4 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - SEMICONDUCTOR PWR INTEGRATION ECU)


    1. Disconnect the semiconductor pwr integration ECU connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-3 (IG1D) - 2E-1 Always Below 1 Ω
      A13-3 (IG1D) or 2E-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR