ECD SYSTEM (w/o DPF) 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 (throttle body assembly), EGR valve position sensor (electric EGR control valve assembly), manifold absolute pressure sensor, accelerator pedal position sensor (accelerator pedal rod assembly) and fuel pressure sensor.

WIRING DIAGRAM

A01BCZUE04
A01BEBXE03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK MIL


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

      OK
      MIL lights up

    OK

    SYSTEM OK

    NG

  2. CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM


    1. Connect an intelligent tester to the DLC3.

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

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

      Result
      Result Proceed To
      Communication is not possible A
      Communication is possible B

    B

    GO TO MIL CIRCUIT

    A

  3. CHECK ECM (VC VOLTAGE)

    A01BE7ME78

    1. Turn the ignition switch to ON.

    2. Measure the voltage of the ECM connector.

      Result
      Tester Connection Specified Condition
      VC (D1-18) - E2 (D1-28) Below 4.5 V

    NEXT

  4. CHECK MIL (THROTTLE POSITION SENSOR)


    1. Disconnect the D50 throttle 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

    4. Reconnect the throttle position sensor connector.


    B

    REPLACE DIESEL THROTTLE BODY ASSEMBLY

    A

  5. CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)


    1. Disconnect the D51 manifold absolute 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

    4. Reconnect the manifold absolute pressure sensor connector.


    B

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

    A

  6. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the B1 accelerator pedal 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

    4. Reconnect the accelerator position sensor connector.


    B

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

    A

  7. CHECK MIL (EGR VALVE POSITION SENSOR)


    1. Disconnect the D52 EGR valve 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

    4. Reconnect the EGR valve position sensor connector.


    B

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

    A

  8. CHECK MIL (FUEL PRESSURE SENSOR)


    1. Disconnect the D69 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

    4. Reconnect the fuel pressure sensor connector.


    B

    REPLACE COMMON RAIL ASSEMBLY

    A

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


    1. A01BBTHE01

      Disconnect the D50 throttle position sensor connector.

    2. Disconnect the D51 manifold absolute pressure sensor connector.

    3. Disconnect the D69 fuel pressure sensor connector.

    4. Disconnect the D52 EGR valve position sensor connector.

    5. Disconnect the B1 accelerator pedal position sensor connector.

    6. Disconnect the B9, D1 and D3 ECM connectors.

    7. Check the resistance.

      Standard resistance (check for short)
      Tester Connection Specified Condition
      VC (D1-18) - Body ground 10 kΩ or higher
      VCS (D3-2) - Body ground 10 kΩ or higher
      VCPA (B9-26) - Body ground 10 kΩ or higher
      VCP2 (B9-27) - Body ground 10 kΩ or higher

    8. Reconnect the throttle position sensor connector.

    9. Reconnect the manifold absolute pressure sensor connector.

    10. Reconnect the fuel pressure sensor connector.

    11. Reconnect the EGR valve position sensor connector.

    12. Reconnect the accelerator pedal position sensor connector.

    13. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM