SFI SYSTEM VC Output Circuit

DTC Code DTC Name
VC Output Circuit

DESCRIPTION

The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B1, ACT1, ACT2, ACT3 and ACT4 terminals to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.

A330641E01

When the VC circuit is short-circuited, the microprocessor in the ECM and the sensors that are supplied with power through the VC circuit are inactivated because power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.

Tip:

Under normal conditions, the MIL is illuminated when the ignition switch is turned to ON. The MIL goes off when the engine is started.

WIRING DIAGRAM

A330562E01
A330563E01

CAUTION / NOTICE / HINT

Note:

  • If the throttle body with motor assembly is repaired or replaced, perform BPM Learning Reset.

    Click here

  • If the Accelerator pedal sensor assembly is replaced, perform Accel Pedal Learning Value Reset.

    Click here

PROCEDURE

  1. CHECK MIL CONDITION

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

      OK

      MIL lights up.

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

  2. CHECK CONNECTION BETWEEN GTS AND ECM

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check for communication between the GTS and ECM.

    Result

    Result

    Proceed to

    Communication is not possible

    A

    Communication is possible

    B
    B

    GO TO MIL CIRCUIT

    Click here

    A

  3. CHECK MIL (THROTTLE POSITION SENSOR)

    1. Disconnect the throttle body with motor assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

    Click here

    A

  4. CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)

    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

    Click here

    A

  5. CHECK MIL (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

    1. Disconnect the camshaft position sensor (for intake camshaft) connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

    Click here

    A

  6. CHECK MIL (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

    1. Disconnect the camshaft position sensor (for exhaust camshaft) connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

    Click here

    A

  7. CHECK MIL (SPEED SENSOR)

    1. Disconnect the speed sensor (crankshaft position sensor) connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE SPEED SENSOR

    Click here

    A

  8. CHECK MIL (VACUUM SENSOR ASSEMBLY)

    1. Disconnect the vacuum sensor assembly (brake booster pressure sensor) connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE VACUUM SENSOR ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    A

  9. CHECK MIL (AIR PRESSURE SENSOR ASSEMBLY)

    1. Disconnect the air pressure sensor assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE AIR PRESSURE SENSOR ASSEMBLY

    Click here

    A

  10. CHECK MIL (AIR CONDITIONER PRESSURE SENSOR)

    1. Disconnect the air conditioner pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

    Result

    Result

    Proceed to

    MIL does not illuminate

    A

    MIL illuminates

    B
    B

    REPLACE AIR CONDITIONER PRESSURE SENSOR

    A

  11. CHECK HARNESS AND CONNECTOR

    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Disconnect the camshaft position sensor (for intake camshaft) connector.

    4. Disconnect the camshaft position sensor (for exhaust camshaft) connector.

    5. Disconnect the speed sensor (crankshaft position sensor) connector.

    6. Disconnect the vacuum sensor (brake booster pressure sensor) connector.

    7. Disconnect the air pressure sensor assembly connector.

    8. Disconnect the air conditioner pressure sensor connector.

    9. Disconnect the ECM connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B55-34 (VCTA) - Body ground and other terminals and other terminals

      Always

      10 kΩ or higher

      A35-46 (+B) - Body ground and other terminals and other terminals

      Always

      10 kΩ or higher

      B55-43 (VCV1) - Body ground and other terminals

      Always

      10 kΩ or higher

      B55-44 (VCE1) - Body ground and other terminals

      Always

      10 kΩ or higher

      B55-36 (VCNE) - Body ground and other terminals

      Always

      10 kΩ or higher

      A35-24 (BRCV) - Body ground and other terminals

      Always

      10 kΩ or higher

      B55-25 (VCPM) - Body ground and other terminals

      Always

      10 kΩ or higher

      A35-21 (A/C) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR