SFI SYSTEM(w/o Canister Pump Module) 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 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 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.

WIRING DIAGRAM

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
      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 engine switch on (IG).

   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 engine switch on (IG).

   3. Check the MIL.

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

   
   

   B

   REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY Click here

   A

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 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 engine switch on (IG).

   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 engine switch on (IG).

   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 engine switch on (IG).

   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 engine switch on (IG).

   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 MIL (FUEL PRESSURE SENSOR)

   
   

   1. Disconnect the fuel pressure sensor connector.

   2. Turn the engine switch on (IG).

   3. Check the MIL.

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

   
   

   B

   REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR) Click here

   A

10. CHECK HARNESS AND CONNECTOR

    
    

    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the accelerator pedal position sensor connector.

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

    4. Disconnect the VVT sensor for exhaust camshaft bank 1 connector.

    5. Disconnect the VVT sensor for intake camshaft bank 2 connector.

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

    7. Disconnect the fuel pressure sensor connector.

    8. Disconnect the ECM connectors.

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

       Standard Resistance
       Tester Connection Condition Specified Condition F1-18 (VC) - Body ground Always 10 kΩ or higher F2-34 (VCTA) - Body ground Always 10 kΩ or higher A76-23 (VCPA) - Body ground Always 10 kΩ or higher A76-22 (VCP2) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR