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ECD SYSTEM(w/ DPF) VC Output Circuit

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DTC Code DTC Name
  VC Output Circuit
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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.

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.

Tip:

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.

A01VM2ZE07
Table 1. *a Diesel Throttle Body Assembly *b Electric EGR Control Valve Assembly *c Accelerator Pedal Sensor Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

CAUTION:

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

Tip:

  • 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.

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PROCEDURE


  1. Click here

    CHECK MIL


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

      Table 2. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  2. Click here

    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.

      Table 3. Result
      Result Proceed to
      Communication is not possible A
      Communication is possible B

  3. Click here

    CHECK MIL (THROTTLE POSITION SENSOR)


    1. Disconnect the diesel throttle body assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

      Table 4. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  4. Click here

    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.

      Table 5. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  5. Click here

    CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)


    1. Disconnect the accelerator pedal sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

      Table 6. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  6. Click here

    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.

      Table 7. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  7. Click here

    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.

      Table 8. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  8. Click here

    CHECK MIL (DIFFERENTIAL PRESSURE SENSOR)


    1. Disconnect the differential pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

      Table 9. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  9. Click here

    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.

      Table 10. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

  10. Click here

    CHECK 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.

      Table 11. Result
      Result Proceed to
      MIL does not illuminate A
      MIL illuminates B

    • AClick here
    • B

      REPLACE OIL PRESSURE SENDER GAUGE ASSEMBLY

  11. Click here

    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 differential pressure sensor connector.

    7. Disconnect the oil pressure sender gauge assembly connector.

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

    9. 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
      A59-33 (VCPX) - Body ground Always 10 kΩ or higher
      B21-15 (VCS) - Body ground Always 10 kΩ or higher
      A59-74 (VC) - Body ground Always 10 kΩ or higher

    • OK

      REPLACE ECM (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR