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.

A01VJDYE04

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 turns off when the engine is started.

WIRING DIAGRAM

A01VJSUE13
*a Diesel Throttle Body Assembly
*b Electric EGR Control Valve Assembly
*c Accelerator Pedal Sensor Assembly
A01VECVE01

CAUTION / NOTICE / HINT

CAUTION:

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

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 does not illuminate A
      MIL illuminates B

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. CHECK COMMUNICATION BETWEEN INTELLIGENT TESTER AND ECM


    1. Connect the intelligent tester to the DLC3.

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

    3. Check the communication between the tester 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 diesel throttle body assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    B

    REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

    A

  4. CHECK MIL (ELECTRIC EGR CONTROL VALVE ASSEMBLY)


    1. Disconnect the electric EGR control valve assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    B

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY Click here

    A

  5. CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)


    1. Disconnect the accelerator pedal 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

    B

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

    A

  6. CHECK MIL (DIESEL TURBO PRESSURE SENSOR)


    1. Disconnect the diesel turbo 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

    B

    REPLACE DIESEL TURBO PRESSURE SENSOR Click here

    A

  7. CHECK MIL (NOZZLE VANE POSITION SENSOR (TURBOCHARGER SUB-ASSEMBLY))


    1. Disconnect the nozzle vane 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

    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY (NOZZLE VANE POSITION SENSOR) Click here

    A

  8. CHECK MIL (FUEL PRESSURE SENSOR (COMMON RAIL ASSEMBLY))


    1. Disconnect the 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

    B

    REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR) Click here

    A

  9. CHECK HARNESS AND CONNECTOR (VC CIRCUIT)


    1. Disconnect the diesel throttle body assembly connector.

    2. Disconnect the electric EGR control valve assembly connector.

    3. Disconnect the accelerator pedal sensor assembly connector.

    4. Disconnect the turbo pressure sensor connector.

    5. Disconnect the nozzle vane position sensor.

    6. Disconnect the fuel pressure sensor connector and the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A59-46 (VCTA) - Body ground Always 10 kΩ or higher
      B21-26 (VCEG) - Body ground Always 10 kΩ or higher
      A59-56 (VCPA) - Body ground Always 10 kΩ or higher
      A59-53 (VCP2) - Body ground Always 10 kΩ or higher
      A59-14 (VPIM) - Body ground Always 10 kΩ or higher
      B21-37 (VNVC) - Body ground Always 10 kΩ or higher
      B21-15 (VCS) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR