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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 uses 5 V 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 receive power through the VC circuit are deactivated 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.

A01CGIHE01
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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 CONNECTION BETWEEN INTELLIGENT TESTER AND ECM


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Check the communication between the tester and ECM.

      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 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

    4. Reconnect the throttle position sensor connector.


  4. Click here

    CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the accelerator pedal sensor assembly connector.


  5. Click here

    CHECK MIL (VVT SENSOR FOR INTAKE SIDE BANK 1)


    1. Disconnect the VVT sensor for intake side 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

    4. Reconnect the VVT sensor for intake side bank 1 connector.


  6. Click here

    CHECK MIL (VVT SENSOR FOR INTAKE SIDE BANK 2)


    1. Disconnect the VVT sensor for intake side 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

    4. Reconnect the VVT sensor for intake side bank 2 connector.


  7. Click here

    CHECK MIL (VVT SENSOR FOR EXHAUST SIDE BANK 1)


    1. Disconnect the VVT sensor for exhaust side 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

    4. Reconnect the VVT sensor for exhaust side bank 1 connector.


  8. Click here

    CHECK MIL (VVT SENSOR FOR EXHAUST SIDE BANK 2)


    1. Disconnect the VVT sensor for exhaust side 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

    4. Reconnect the VVT sensor for exhaust side bank 2 connector.


  9. Click here

    CHECK MIL (BATTERY CURRENT SENSOR ASSEMBLY)


    1. Disconnect the battery current sensor assembly connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the battery current sensor assembly connector.


  10. Click here

    CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)


    1. Disconnect the throttle position sensor connector.

    2. Disconnect the ECM connector.

    3. A01CEM8E03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-96 (VCTA) or D26-5 (VC) - Body ground Always 10 kΩ or higher

    4. Reconnect the throttle position sensor connector.

    5. Reconnect the ECM connector.


  11. Click here

    CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Disconnect the ECM connector.

    3. A01CEMFE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A8-58 (VCP2) or A3-1 (VCP2) - Body ground Always 10 kΩ or higher
      A8-57 (VCPA) or A3-4 (VCPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor.

    5. Reconnect the ECM connector.


  12. Click here

    CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE BANK 1 - ECM)


    1. Disconnect the VVT sensor for intake side bank 1 connector.

    2. Disconnect the ECM connector.

    3. A01CBGEE05

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-115 (VCV1) or D38-3 (VC) - Body ground Always 10 kΩ or higher

    4. Reconnect the VVT sensor for intake side bank 1 connector.

    5. Reconnect the ECM connector.


  13. Click here

    CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE BANK 2 - ECM)


    1. Disconnect the VVT sensor for intake side bank 2 connector.

    2. Disconnect the ECM connector.

    3. A01CBGEE06

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-113 (VCV2) or D19-3 (VC) - Body ground Always 10 kΩ or higher

    4. Reconnect the VVT sensor for intake side bank 2 connector.

    5. Reconnect the ECM connector.


  14. Click here

    CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE BANK 1 - ECM)


    1. Disconnect the VVT sensor for exhaust side bank 1 connector.

    2. Disconnect the ECM connector.

    3. A01CBGEE07

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-114 (VCE1) or D33-3 (VC2) - Body ground Always 10 kΩ or higher

    4. Reconnect the VVT sensor for exhaust side bank 1 connector.

    5. Reconnect the ECM connector.


  15. Click here

    CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE BANK 2 - ECM)


    1. Disconnect the VVT sensor for exhaust side bank 2 connector.

    2. Disconnect the ECM connector.

    3. A01CBGEE08

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-112 (VCE2) or D14-3 (VC2) - Body ground Always 10 kΩ or higher

    4. Reconnect the VVT sensor for exhaust side bank 2 connector.

    5. Reconnect the ECM connector.


  16. Click here

    CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR ASSEMBLY - ECM)


    1. Disconnect the battery current sensor assembly connector.

    2. Disconnect the ECM connector.

    3. A01CDRJE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-80 (VCIB) or A2-2 (VC5) - Body ground Always 10 kΩ or higher

    4. Reconnect the battery current sensor assembly connector.

    5. Reconnect the ECM connector.


  17. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  18. Click here

    GO TO MIL CIRCUITClick here

  19. Click here

    REPLACE THROTTLE WITH MOTOR BODY ASSEMBLYClick here

  20. Click here

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLYClick here

  21. Click here

    REPLACE VVT SENSOR FOR INTAKE SIDE BANK 1Click here

  22. Click here

    REPLACE VVT SENSOR FOR INTAKE SIDE BANK 2Click here

  23. Click here

    REPLACE VVT SENSOR FOR EXHAUST SIDE BANK 1Click here

  24. Click here

    REPLACE VVT SENSOR FOR EXHAUST SIDE BANK 2Click here

  25. Click here

    REPLACE BATTERY CURRENT SENSOR ASSEMBLYClick here

  26. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM)

  27. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

  28. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR INTAKE SIDE BANK 1 - ECM)

  29. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR INTAKE SIDE BANK 2 - ECM)

  30. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR EXHAUST SIDE BANK 1 - ECM)

  31. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR EXHAUST SIDE BANK 2 - ECM)

  32. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY CURRENT SENSOR ASSEMBLY - ECM)

  33. Click here

    REPLACE ECMClick here