ECD SYSTEM 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, manifold absolute pressure sensor, accelerator position sensor and fuel pressure 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.

      Result

      Condition	Proceed to
      MIL does not illuminate	A
      MIL illuminates	B

   
   

   B

   SYSTEM OK

   A

2. CHECK CONNECTION BETWEEN GTS AND ECM

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch ON and GTS ON.

   3. Check the communication between the GTS and ECM.

      Result
      Condition 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 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

   4. Reconnect the throttle position sensor connector.

   
   

   B

   REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

   A

4. CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)

   
   

   1. Disconnect the manifold absolute pressure sensor connector.

   2. Turn the ignition switch ON.

   3. Check the MIL.

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

   4. Reconnect the manifold absolute pressure sensor connector.

   
   

   B

   REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

   A

5. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

   
   

   1. Disconnect the accelerator pedal 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

   4. Reconnect the accelerator position sensor connector.

   
   

   B

   REPLACE ACCELERATOR PEDAL ROD ASSEMBLY Click here

   A

6. CHECK MIL (FUEL PRESSURE SENSOR)

   
   

   1. Disconnect the fuel pressure sensor connector.

   2. Turn the ignition switch ON.

   3. Check the MIL.

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

   4. Reconnect the fuel pressure sensor connector.

   
   

   B

   REPLACE COMMON RAIL ASSEMBLY Click here

   A

7. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

   
   

   1. Disconnect the throttle position sensor connector.

   2. Disconnect the manifold absolute pressure sensor connector.

   3. Disconnect the fuel pressure sensor connector.

   4. Disconnect the accelerator pedal position sensor connector.

   5. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition D105-97 (VCVL) - Body ground Always 10 kΩ or higher D105-93 (VCPM) - Body ground Always 10 kΩ or higher D105-68 (VCS) - Body ground Always 10 kΩ or higher B88-55 (VCPA) - Body ground Always 10 kΩ or higher B88-58 (VCP2) - Body ground Always 10 kΩ or higher

   7. Reconnect the throttle position sensor connector.

   8. Reconnect the manifold absolute pressure sensor connector.

   9. Reconnect the fuel pressure sensor connector.

   10. Reconnect the accelerator pedal position sensor connector.

   11. Reconnect the ECM connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE ECM Click here