SFI SYSTEM VC Output Circuit

DESCRIPTION

The ECM constantly generates 5 V power source voltage from the battery voltages 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.

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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.

Tech Tips

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

A002BTJE01
*a VVT Sensor (for Intake Camshaft of Bank 1)
*b VVT Sensor (for Intake Camshaft of Bank 2)
*c VVT Sensor (for Exhaust Camshaft of Bank 1)
*d VVT Sensor (for Exhaust Camshaft of Bank 2)
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*a Throttle Body with Motor Assembly
*b Accelerator Pedal Sensor Assembly

PROCEDURE


  1. CHECK MIL


    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 the 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

      Tech Tips

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

      Click here


    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 (VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 1))


    1. Disconnect the VVT sensor (for intake camshaft of bank 1) 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 VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 1) Click here

    A

  6. CHECK MIL (VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 2))


    1. Disconnect the VVT sensor (for intake camshaft of bank 2) 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 VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 2) Click here

    A

  7. CHECK MIL (VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1))


    1. Disconnect the VVT sensor (for exhaust camshaft of bank 1) 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 VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1) Click here

    A

  8. CHECK MIL (VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2))


    1. Disconnect the VVT sensor (for exhaust camshaft of bank 2) 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 VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2) Click here

    A

  9. CHECK HARNESS AND CONNECTOR (VC CIRCUIT)


    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Disconnect the VVT sensor (for intake camshaft of bank 1) connector.

    4. Disconnect the VVT sensor (for intake camshaft of bank 2) connector.

    5. Disconnect the VVT sensor (for exhaust camshaft of bank 1) connector.

    6. Disconnect the VVT sensor (for exhaust camshaft of bank 2) connector.

    7. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C41-5 (VC) or C1-126 (VCTA) - Body ground Always 10 kΩ or higher
      A53-4 (VCPA) or A43-56 (VCPA) - Body ground Always 10 kΩ or higher
      A53-1 (VCP2) or A43-59 (VCP2) - Body ground Always 10 kΩ or higher
      C1-111 (VCV1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR