SFI SYSTEM VC Output Circuit

DESCRIPTION

The VC voltage (5 V) is generated in the ECM. The voltage is used to supply power to the throttle position sensor, canister pump module, etc.

WIRING DIAGRAM

A01DV4IE05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK MIL


    1. Check that MIL (Malfunction Indicator Lamp) lights up when turning the ignition switch ON.

      OK
      MIL lights up

    OK

    SYSTEM OK

    NG

  2. CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Check the connection between the intelligent tester and ECM.

      Result
      Condition Proceed to
      Communication is possible A
      Communication is not possible B

    A

    GO TO MIL CIRCUIT

    B

  3. INSPECT ECM (VC VOLTAGE)

    A01DW5TE34

    1. Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      E12-18 (VC) - E12-3 (E1) Voltage is not 5 V

    NEXT

  4. CHECK MIL (THROTTLE POSITION SENSOR)


    1. Disconnect the T25 throttle body connector.

    2. Turn the ignition switch ON.

    3. Check the MIL.

      Result
      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A

    REPLACE THROTTLE BODY

    B

  5. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the A13 accelerator pedal position sensor connector.

    2. Turn the ignition switch ON.

    3. Check the MIL.

      Result
      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A

    REPLACE ACCELERATOR PEDAL POSITION SENSOR

    B

  6. CHECK WIRE HARNESS (ECM - BODY GROUND)

    A01E1OFE08

    1. Disconnect the T25 throttle body connector.

    2. Disconnect the A13 accelerator pedal position sensor connector.

    3. Disconnect the E9 and E12 ECM connectors.

    4. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      E12-18 (VC) - Body ground 10 kΩ or higher
      E9-26 (VCPA) - Body ground 10 kΩ or higher
      E9-27 (VCP2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM