SFI SYSTEM(w/ EGR 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 +B (BATT) terminal to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.

A207756E52

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power through the VC circuit are inactivated because the 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 for several seconds when the engine switch is first turned on (IG). The MIL goes off when the engine is started.

WIRING DIAGRAM

A231459E05
A231461E03
A165789E23

INSPECTION PROCEDURE

PROCEDURE

  1. CHECK MIL

    1. Check that the Malfunction Indicator Lamp (MIL) lights up when the engine switch is turned on (IG).

      OK

      MIL lights up.

      Result

      Result

      OK

      NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

  2. CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Check the communication between the intelligent tester and ECM.

      Result

      Result

      Proceed to

      Communication is possible

      A

      Communication is not possible

      B
    A

    GO TO MIL CIRCUIT

    Click here

    B

  3. CHECK MIL (THROTTLE POSITION SENSOR)

    1. Disconnect the throttle body connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE THROTTLE BODY ASSEMBLY

    Click here

    B

  4. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

    1. Disconnect the accelerator pedal position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE ACCELERATOR PEDAL POSITION SENSOR ASSEMBLY

    Click here

    B

  5. CHECK MIL (AIR SWITCHING VALVE ASSEMBLY FOR BANK 1)

    1. Disconnect the air switching valve connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE AIR SWITCHING VALVE ASSEMBLY

    Click here

    B

  6. CHECK MIL (AIR SWITCHING VALVE ASSEMBLY FOR BANK 2)

    1. Disconnect the air switching valve connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE AIR SWITCHING VALVE ASSEMBLY

    Click here

    B

  7. CHECK MIL (POWER STEERING OIL PRESSURE SWITCH)

    1. Disconnect the power steering oil pressure switch connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE POWER STEERING OIL PRESSURE SWITCH

    Click here

    B

  8. CHECK MIL (CAMSHAFT POSITION SENSOR)

    1. Disconnect the camshaft position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE CAMSHAFT POSITION SENSOR

    Click here

    B

  9. CHECK MIL (CRANKSHAFT POSITION SENSOR)

    1. Disconnect the crankshaft position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE CRANKSHAFT POSITION SENSOR

    Click here

    B

  10. CHECK MIL (VVT SENSOR FOR INTAKE SIDE OF BANK 1)

    1. Disconnect the VVT sensor (for Intake Side of Bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 1)

    Click here

    B

  11. CHECK MIL (VVT SENSOR FOR EXHAUST SIDE OF BANK 1)

    1. Disconnect the VVT sensor (for Exhaust Side of Bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 1)

    Click here

    B

  12. CHECK MIL (VVT SENSOR FOR INTAKE SIDE OF BANK 2)

    1. Disconnect the VVT sensor (for Intake Side of Bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 2)

    Click here

    B

  13. CHECK MIL (VVT SENSOR FOR EXHAUST SIDE OF BANK 2)

    1. Disconnect the VVT sensor (for Exhaust Side of Bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 2)

    Click here

    B

  14. CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)

    1. Disconnect the manifold absolute pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Result

      Result

      Proceed to

      MIL illuminates

      A

      MIL does not illuminate

      B
    A

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

    Click here

    B

  15. CHECK HARNESS AND CONNECTOR

    1. Disconnect the throttle body connector.

    2. Disconnect the accelerator pedal position sensor connector.

    3. Disconnect the air switching valve connector (for Bank 1).

    4. Disconnect the air switching valve connector (for Bank 2).

    5. Disconnect the power steering oil pressure switch connector.

    6. Disconnect the camshaft position sensor connector.

    7. Disconnect the crankshaft position sensor connector.

    8. Disconnect the VVT sensor (for Intake Side of Bank 1) connector.

    9. Disconnect the VVT sensor (for Exhaust Side of Bank 1) connector.

    10. Disconnect the VVT sensor (for Intake Side of Bank 2) connector.

    11. Disconnect the VVT sensor (for Exhaust Side of Bank 2) connector.

    12. Disconnect the manifold absolute pressure sensor connector.

    13. Disconnect the ECM connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C30-13 (VCTA) - Body ground

      Always

      10 kΩ or higher

      G45-4 (VCPA) - Body ground

      Always

      10 kΩ or higher

      G45-2 (VCP2) - Body ground

      Always

      10 kΩ or higher

      C28-16 (VCV2) - Body ground

      Always

      10 kΩ or higher

      C28-15 (VCV1) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR