SFI SYSTEM VC Output Circuit

DESCRIPTION

The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B, +B2 (BATT) terminals 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 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

*a	Throttle Body with Motor Assembly
*b	Accelerator Pedal Sensor Assembly
*c	Camshaft Position Sensor (for Intake Camshaft)
*d	Camshaft Position Sensor (for Exhaust Camshaft)

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 COMMUNICATION 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)

   
   

   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 (CRANKSHAFT POSITION SENSOR)

   
   

   1. Disconnect the crankshaft position sensor 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 CRANKSHAFT POSITION SENSOR Click here

   A

6. CHECK MIL (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

   
   

   1. Disconnect the camshaft position sensor (for intake camshaft) 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 CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) Click here

   A

7. CHECK MIL (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

   
   

   1. Disconnect the camshaft position sensor (for exhaust camshaft) 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 CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) Click here

   A

8. CHECK MIL (OIL PRESSURE SENDER GAUGE ASSEMBLY)

   
   

   1. Disconnect the oil pressure sender gauge 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 OIL PRESSURE SENDER GAUGE ASSEMBLY Click here

   A

9. CHECK MIL (FUEL PRESSURE SENSOR)

   
   

   1. Disconnect the fuel pressure sensor 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 FUEL DELIVERY PIPE (FUEL PRESSURE SENSOR) Click here

   A

10. CHECK MIL (NO. 1 TURBO PRESSURE SENSOR)

    
    

    1. Disconnect the No. 1 turbo pressure sensor 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 NO. 1 TURBO PRESSURE SENSOR Click here

    A

11. CHECK MIL (NO. 2 TURBO PRESSURE SENSOR)

    
    

    1. Disconnect the No. 2 turbo pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

       Result
       Result Proceed to MIL does not illuminate (for CVT models) A MIL does not illuminate (for M/T models) B MIL illuminates C

    
    

    B

    GO TO STEP 13 Click here

    C

    REPLACE NO. 2 TURBO PRESSURE SENSOR Click here

    A

12. CHECK MIL (OIL PRESSURE SENSOR)

    
    

    1. Disconnect the oil pressure sensor 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 OIL PRESSURE SENSOR Click here

    A

13. CHECK HARNESS AND CONNECTOR

    
    

    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Disconnect the crankshaft position sensor connector.

    4. Disconnect the camshaft position sensor (for intake camshaft) connector.

    5. Disconnect the camshaft position sensor (for exhaust camshaft) connector.

    6. Disconnect the oil pressure sender gauge assembly connector.

    7. Disconnect the fuel pressure sensor connector.

    8. Disconnect the No. 1 turbo pressure sensor connector.

    9. Disconnect the No. 2 turbo pressure sensor connector.

    10. Disconnect the oil pressure sensor connector (for CVT models).

    11. Disconnect the ECM connector.

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

        Standard Resistance

        Tester Connection Condition Specified Condition B208-121 (VCTA) - Body ground Always 10 kΩ or higher A173-49 (VCPA) - Body ground Always 10 kΩ or higher A173-52 (VCP2) - Body ground Always 10 kΩ or higher B208-113 (VCV1) - Body ground Always 10 kΩ or higher B208-111 (VCE1) - Body ground Always 10 kΩ or higher B208-110 (VCNE) - Body ground Always 10 kΩ or higher B208-130 (VCPE) - Body ground Always 10 kΩ or higher B208-136 (VCPR) - Body ground Always 10 kΩ or higher B208-118 (VCPT) - Body ground Always 10 kΩ or higher B208-140 (VPTA) - Body ground Always 10 kΩ or higher B208-138 (VCPM) - Body ground Always 10 kΩ or higher

        Result
        Proceed to OK NG

    
    

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR