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СИСТЕМА SFI VC Output Circuit

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DTC Code DTC Name
  VC Output Circuit
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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.

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.

A01EP47E03
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK MIL


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

      OK
      MIL lights up.

  2. Click here

    CHECK COMMUNICATION BETWEEN GTS AND ECM


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Table 1. Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

  3. Click here

    CHECK MIL (THROTTLE POSITION SENSOR)


    1. Disconnect the throttle body connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Table 2. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  4. Click here

    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.

      Table 3. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  5. Click here

    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.

      Table 4. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  6. Click here

    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.

      Table 5. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  7. Click here

    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.

      Table 6. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  8. Click here

    CHECK MIL (CAMSHAFT POSITION SENSOR)


    1. Disconnect the camshaft position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Table 7. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  9. Click here

    CHECK MIL (CRANKSHAFT POSITION SENSOR)


    1. Disconnect the crankshaft position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Table 8. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  10. Click here

    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.

      Table 9. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  11. Click here

    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.

      Table 10. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  12. Click here

    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.

      Table 11. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  13. Click here

    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.

      Table 12. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  14. Click here

    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.

      Table 13. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  15. Click here

    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
      C54-80 (VCTA) - Body ground Always 10 kΩ or higher
      A53-57 (VCPA) - Body ground Always 10 kΩ or higher
      A53-59 (VCP2) - Body ground Always 10 kΩ or higher
      C54-66 (VCV2) - Body ground Always 10 kΩ or higher
      C54-67 (VCV1) - Body ground Always 10 kΩ or higher

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    GO TO MIL CIRCUITClick here

  17. Click here

    REPLACE THROTTLE BODY ASSEMBLYClick here

  18. Click here

    REPLACE ACCELERATOR PEDAL POSITION SENSOR ASSEMBLYClick here

  19. Click here

    REPLACE AIR SWITCHING VALVE ASSEMBLYClick here

  20. Click here

    REPLACE AIR SWITCHING VALVE ASSEMBLYClick here

  21. Click here

    REPLACE POWER STEERING OIL PRESSURE SWITCHClick here

  22. Click here

    REPLACE CAMSHAFT POSITION SENSORClick here

  23. Click here

    REPLACE CRANKSHAFT POSITION SENSORClick here

  24. Click here

    REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 1)Click here

  25. Click here

    REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 1)Click here

  26. Click here

    REPLACE VVT SENSOR (FOR INTAKE SIDE OF BANK 2)Click here

  27. Click here

    REPLACE VVT SENSOR (FOR EXHAUST SIDE OF BANK 2)Click here

  28. Click here

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSORClick here

  29. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  31. Click here

    REPLACE ECMClick here