СИСТЕМА SFI VC Output Circuit

DESCRIPTION

The VC voltage (5 V) is generated in the ECM. The voltage is used to supply power to the throttle position sensor, camshaft position sensor and crankshaft position sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK MIL

   
   

   1. Check that the Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch ON.

      OK
      MIL lights up

   
   

   OK

   SYSTEM OK

   NG

2. CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch ON and intelligent tester ON.

   3. Check the communication between the intelligent tester and ECM.

      Result
      Condition Proceed to Communication is not possible A Communication is possible B

   
   

   B

   GO TO MIL CIRCUIT

   A

3. CHECK ECM

   

   
   

   1. Turn the ignition switch ON.

   2. Measure the voltage of the ECM connector.

      Result
      Voltage is not 5 V

   
   

   NEXT

4. CHECK MIL (THROTTLE POSITION SENSOR)

   
   

   1. Disconnect the T1 throttle position sensor connector.

   2. Turn the ignition switch ON.

   3. Check the MIL.

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

   
   

   B

   REPLACE THROTTLE BODY ASSEMBLY

   A

5. CHECK MIL (CAMSHAFT POSITION SENSOR (BANK 1))

   
   

   1. Disconnect the C21 camshaft position sensor connector.

   2. Turn the ignition switch ON.

   3. Check the MIL.

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

   
   

   B

   REPLACE CAMSHAFT POSITION SENSOR (BANK 1)

   A

6. CHECK MIL (CAMSHAFT POSITION SENSOR (BANK 2))

   
   

   1. Disconnect the C20 camshaft position sensor connector.

   2. Turn the ignition switch ON.

   3. Check the MIL.

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

   
   

   B

   REPLACE CAMSHAFT POSITION SENSOR (BANK 2)

   A

7. CHECK WIRE HARNESS (VC - BODY GROUND)

   

   
   

   1. Disconnect the T1 throttle position sensor connector.

   2. Disconnect the C20 and C21 camshaft position sensor connectors.

   3. Measure the resistance of the wire harness side connector.

      Standard resistance (check for short)
      Tester Connection Specified Condition E15-23 (VC) - Body ground 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

   REPLACE ECM