ECD SYSTEM (w/ 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.

A01KGX6E02

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

A01KHVFE01
A01KHV1E01

INSPECTION PROCEDURE

Note


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

  • After replacing the fuel supply pump assembly or suction control valve, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration 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 does not illuminate A
      MIL illuminates B

    B

    END

    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 the tester on.

    3. Check the communication between the tester and ECM.

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

    B

    GO TO MIL CIRCUIT Click here

    A

  3. CHECK MIL (ACCELERATOR PEDAL LINK ASSEMBLY)


    1. Disconnect the accelerator pedal link 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 ACCELERATOR PEDAL LINK ASSEMBLY Click here

    A

  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 does not illuminate A
      MIL illuminates B

    B

    REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

    A

  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 does not illuminate A
      MIL illuminates B

    B

    REPLACE COMMON RAIL ASSEMBLY Click here

    A

  6. 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

  7. CHECK MIL (DIFFERENTIAL PRESSURE SENSOR)


    1. Disconnect the differential 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 DIFFERENTIAL PRESSURE SENSOR Click here

    A

  8. 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 does not illuminate A
      MIL illuminates B

    B

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

    A

  9. 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 does not illuminate A
      MIL illuminates B

    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    A

  10. REPAIR MIL (OIL PRESSURE SENDER GAUGE ASSEMBLY)


    1. Disconnect the oil pressure sender gauge 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 OIL PRESSURE SENDER GAUGE ASSEMBLY

    A

  11. CHECK HARNESS AND CONNECTOR (ECM - EACH SENSOR)


    1. Disconnect the accelerator pedal link assembly connector.

    2. Disconnect the throttle position sensor connector.

    3. Disconnect the fuel pressure sensor connector.

    4. Disconnect the electric EGR control valve assembly connector.

    5. Disconnect the differential pressure sensor connector.

    6. Disconnect the nozzle vane position sensor connector.

    7. Disconnect the manifold absolute pressure sensor connector.

    8. Disconnect the oil pressure sender gauge assembly connector.

    9. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E13-14 (VCM) - Body ground Always 10 kΩ or higher
      E13-13 (VCS) - Body ground Always 10 kΩ or higher
      E12-12 (VCPM) - Body ground Always 10 kΩ or higher
      E12-8 (VCVL) - Body ground Always 10 kΩ or higher
      E16-6 (VCPA) - Body ground Always 10 kΩ or higher
      E16-4 (VCP2) - Body ground Always 10 kΩ or higher
      E12-13 (VCPX) - Body ground Always 10 kΩ or higher
      E12-11 (VNVC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here