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ECD SYSTEM (for CCo) 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 ON. The MIL goes off when the engine is started.

A01IP5NE01
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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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 1. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate 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 tester on.

    3. Check the communication between the tester and ECM.

      Table 2. Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

  3. Click here

    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.

      Table 3. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    4. Reconnect the accelerator pedal position sensor connector.


  4. Click here

    CHECK MIL (DIESEL THROTTLE BODY ASSEMBLY)


    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 illuminates A
      MIL does not illuminate B

    4. Reconnect the diesel throttle body assembly connector.


  5. Click here

    CHECK MIL (FUEL PRESSURE SENSOR)


    1. Disconnect the fuel pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the fuel pressure sensor connector.


  6. Click here

    CHECK MIL (EGR VALVE ASSEMBLY)


    1. Disconnect the EGR valve assembly connector.

    2. Turn the ignition switch to ON.

    3. Check the MIL.

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

    4. Reconnect the EGR valve assembly connector.


  7. Click here

    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.

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

    4. Reconnect the manifold absolute pressure sensor connector.


  8. Click here

    CHECK HARNESS AND CONNECTOR


    1. Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the diesel throttle body assembly connector.

    3. Disconnect the fuel pressure sensor connector.

    4. Disconnect the EGR valve assembly connector.

    5. Disconnect the manifold absolute pressure sensor connector.

    6. A01IR7JE05

      Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A51-55 (VCPA) - Body ground Always 10 kΩ or higher
      A51-57 (VCP2) - Body ground Always 10 kΩ or higher
      C69-97 (VCVL) - Body ground Always 10 kΩ or higher
      C69-68 (VCM) - Body ground Always 10 kΩ or higher
      C69-69 (VCS) - Body ground Always 10 kΩ or higher
      C69-94 (VCEG) - Body ground Always 10 kΩ or higher
      C69-93 (VCPM) - Body ground Always 10 kΩ or higher
      Table 8. Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
      *2

      Front view of wire harness connector

      (to ECM)

    8. Reconnect the accelerator pedal position sensor connector.

    9. Reconnect the diesel throttle body assembly connector.

    10. Reconnect the fuel pressure sensor connector.

    11. Reconnect the EGR valve assembly connector.

    12. Reconnect the manifold absolute pressure sensor connector.

    13. Reconnect the ECM connectors.


  9. Click here

    END

  10. Click here

    GO TO MIL CIRCUITClick here

  11. Click here

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLYClick here

  12. Click here

    REPLACE DIESEL THROTTLE BODY ASSEMBLYClick here

  13. Click here

    REPLACE COMMON RAILClick here

  14. Click here

    REPLACE EGR VALVE ASSEMBLYClick here

  15. Click here

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSORClick here

  16. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. Click here

    REPLACE ECMClick here