ECD SYSTEM (w/o DPF) VC Output Circuit

DESCRIPTION

The ECM constantly generates 5 V of power from the battery voltage supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

A00OA3IE06

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power through the VC circuit are inactivated because the 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.

Tech Tips

Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned to ON. The MIL goes off when the engine is started.

WIRING DIAGRAM

A00O4FXE01
A00O3TNE01

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

PROCEDURE


  1. CHECK MIL


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

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

    A

    END

    B

  2. CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM


    1. Connect the intelligent tester to the DLC3.

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

    3. Check the communication between the tester and ECM.

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

    A

    GO TO MIL CIRCUIT Click here

    B

  3. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the accelerator pedal position sensor connector.


    A

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLY Click here

    B

  4. CHECK MIL (THROTTLE POSITION SENSOR)


    1. Disconnect the throttle position sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the throttle position sensor connector.


    A

    REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

    B

  5. 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 illuminates A
      MIL does not illuminate B

    4. Reconnect the fuel pressure sensor connector.


    A

    REPLACE COMMON RAIL Click here

    B

  6. CHECK MIL (EGR VALVE POSITION SENSOR)


    1. Disconnect the EGR valve position sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the EGR valve position sensor connector.


    A

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY Click here

    B

  7. CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)


    1. Disconnect the manifold absolute pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the manifold absolute pressure sensor connector.


    A

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Click here

    B

  8. CHECK MIL (NOZZLE VANE POSITION SENSOR)


    1. Disconnect the nozzle vane position sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the nozzle vane position sensor connector.


    A

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    B

  9. CHECK HARNESS AND CONNECTOR


    1. Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the throttle position sensor connector.

    3. Disconnect the fuel pressure sensor connector.

    4. Disconnect the EGR position sensor connector.

    5. Disconnect the nozzle vane position sensor connector.

    6. Disconnect the manifold absolute pressure sensor 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
      G58-6 (VCPA) - Body ground Always 10 kΩ or higher
      G58-4 (VCP2) - Body ground Always 10 kΩ or higher
      C91-8 (VCVL) - Body ground Always 10 kΩ or higher
      C90-14 (VCM) - Body ground Always 10 kΩ or higher
      C90-13 (VCS) - Body ground Always 10 kΩ or higher
      C91-13 (VCEG) - Body ground Always 10 kΩ or higher
      C91-12 (VCPM) - Body ground Always 10 kΩ or higher
      C91-11 (VNVC) - Body ground Always 10 kΩ or higher

    9. Reconnect the accelerator pedal position sensor connector.

    10. Reconnect the throttle position sensor connector.

    11. Reconnect the fuel pressure sensor connector.

    12. Reconnect the EGR position sensor connector.

    13. Reconnect the nozzle vane position sensor connector.

    14. Reconnect the manifold absolute pressure sensor connector.

    15. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here