SFI SYSTEM(w/ Canister Pump Module) VC Output Circuit

DESCRIPTION

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

When the VC circuit is short-circuited, the microprocessor in the ECM and the sensors that are supplied with power through the VC circuit are inactivated 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 with Motor Body Assembly
*b	Accelerator Pedal Sensor Assembly

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 COMMUNICATION 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 with motor body 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

      Tech Tips

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

      Click here

   
   

   B

   REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

   A

4. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

   
   

   1. Disconnect the accelerator pedal sensor 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 ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

   A

5. CHECK MIL (CANISTER PUMP MODULE)

   
   

   1. Disconnect the canister pump module 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 CHARCOAL CANISTER LEAK DETECTION PUMP SUB-ASSEMBLY (CANISTER PUMP MODULE) Click here

   A

6. CHECK MIL (INTAKE AIR CONTROL VALVE ACTUATOR (FOR TUMBLE CONTROL VALVE))

   
   

   1. Disconnect the intake air control valve actuator (for tumble control valve) 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 INTAKE AIR CONTROL VALVE ACTUATOR (FOR TUMBLE CONTROL VALVE) Click here

   A

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

   
   

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

   A

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

   
   

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

   A

9. CHECK HARNESS AND CONNECTOR

   
   

   1. Disconnect the throttle with motor body assembly connector.

   2. Disconnect the accelerator pedal sensor assembly connector.

   3. Disconnect the canister pump module connector.

   4. Disconnect the intake air control valve actuator (for tumble control valve) connector.

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

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

   7. Disconnect the ECM connectors.

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

      Standard Resistance

      Tester Connection Condition Specified Condition B77-125 (VCTA) - Body ground Always 10 kΩ or higher A62-53 (VCPA) - Body ground Always 10 kΩ or higher A62-56 (VCP2) - Body ground Always 10 kΩ or higher B77-130 (VCIA) - Body ground Always 10 kΩ or higher A62-34 (VCPP) - Body ground Always 10 kΩ or higher B77-111 (VCE1) - Body ground Always 10 kΩ or higher B77-113 (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