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SFI SYSTEM VC Output Circuit

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DTC Code DTC Name
  VC Output Circuit
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DESCRIPTION

The ECM constantly generates 5 V power from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power 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.

A0158CXE03
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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 turning the engine switch 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) and tester on.

    3. Check the communication between the tester 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 C3 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 A31 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 (POWER STEERING OIL PRESSURE SENSOR)


    1. Disconnect the C59 power steering oil pressure sensor 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 (CAMSHAFT POSITION SENSOR)


    1. Disconnect the C99 camshaft position sensor 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 (CRANKSHAFT POSITION SENSOR)


    1. Disconnect the C114 crankshaft position sensor 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 (VVT SENSOR for Intake Side of Bank 1)


    1. Disconnect the C100 VVT sensor (for Intake Side of Bank 1) 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 (VVT SENSOR for Exhaust Side of Bank 1)


    1. Disconnect the C121T sensor (for Exhaust Side of Bank 1) 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 2)


    1. Disconnect the C101 VVT sensor (for Intake Side of Bank 2) 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

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    CHECK MIL (VVT SENSOR for Exhaust Side of Bank 2)


    1. Disconnect the C122T sensor (for Exhaust Side of Bank 2) 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 HARNESS AND CONNECTOR


    1. Disconnect the C3 throttle body connector.

    2. Disconnect the A31 accelerator pedal position sensor connector.

    3. Disconnect the C59 power steering oil pressure sensor connector.

    4. Disconnect the C99 camshaft position sensor connector.

    5. Disconnect the C114 crankshaft position sensor connector.

    6. Disconnect the C100 VVT sensor (for Intake Side of Bank 1) connector.

    7. Disconnect the C121 VVT sensor (for Exhaust Side of Bank 1) connector.

    8. Disconnect the C101 VVT sensor (for Intake Side of Bank 2) connector.

    9. Disconnect the C122 VVT sensor (for Exhaust Side of Bank 2) connector.

    10. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C45-80 (VCTA) - Body ground Always 10 kΩ or higher
      A38-57 (VCPA) - Body ground Always 10 kΩ or higher
      A38-59 (VCP2) - Body ground Always 10 kΩ or higher
      C45-66 (VCV2) - Body ground Always 10 kΩ or higher
      C45-67 (VCV1) - Body ground Always 10 kΩ or higher

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    GO TO MIL CIRCUITClick here

  14. Click here

    REPLACE THROTTLE BODY ASSEMBLYClick here

  15. Click here

    REPLACE ACCELERATOR PEDAL POSITION SENSORClick here

  16. Click here

    REPLACE POWER STEERING OIL PRESSURE SENSORClick here

  17. Click here

    REPLACE CAMSHAFT POSITION SENSORClick here

  18. Click here

    REPLACE CRANKSHAFT POSITION SENSORClick here

  19. Click here

    REPLACE VVT SENSOR (for Intake Side of Bank 1)Click here

  20. Click here

    REPLACE VVT SENSOR (for Exhaust Side of Bank 1)Click here

  21. Click here

    REPLACE VVT SENSOR (for Intake Side of Bank 2)Click here

  22. Click here

    REPLACE VVT SENSOR (for Exhaust Side of Bank 2)Click here

  23. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    SYSTEM OK

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    REPLACE ECMClick here