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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 engine switch is first turned on (IG). The MIL goes off when the engine is started.

A015C7OE03
A0155RGE02
A01559ME08
A015C7OE01
A0155RGE01
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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 engine switch on (IG).

      Table 1. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

  2. Click here

    CHECK COMMUNICATION BETWEEN GTS AND ECM


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and GTS on.

    3. Check the communication between the GTS and ECM.

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

  3. Click here

    CHECK MIL (THROTTLE POSITION SENSOR (for Bank 1))


    1. Disconnect the C83 throttle position sensor (for Bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C83 throttle position sensor (for Bank 1) connector.


  4. Click here

    CHECK MIL (THROTTLE POSITION SENSOR (for Bank 2))


    1. Disconnect the C84 throttle position sensor (for Bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C84 throttle position sensor (for Bank 2) connector.


  5. Click here

    CHECK MIL (NO. 1 EGR VALVE POSITION SENSOR)


    1. Disconnect the C87 No. 1 EGR valve connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C87 No. 1 EGR valve connector.


  6. Click here

    CHECK MIL (NO. 2 EGR VALVE POSITION SENSOR)


    1. Disconnect the C88 No. 2 EGR valve connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C88 No. 2 EGR valve connector.


  7. Click here

    CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the A31 accelerator pedal position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the A31 accelerator pedal position sensor connector.


  8. Click here

    CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR)


    1. Disconnect the C80 manifold absolute pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C80 manifold absolute pressure sensor connector.


  9. Click here

    CHECK MIL (FUEL PRESSURE SENSOR)


    1. Disconnect the C82 fuel pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C82 fuel pressure sensor connector.


  10. Click here

    CHECK MIL (DIFFERENTIAL PRESSURE SENSOR ASSEMBLY (for Bank 1))


    1. Disconnect the N16 differential pressure sensor assembly (for Bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the N16 differential pressure sensor assembly (for Bank 1) connector.


  11. Click here

    CHECK MIL (DIFFERENTIAL PRESSURE SENSOR ASSEMBLY (for Bank 2))


    1. Disconnect the C157 differential pressure sensor assembly (for Bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the C157 differential pressure sensor assembly (for Bank 2) connector.


  12. Click here

    CHECK MIL (NOZZLE VANE POSITION SENSOR (for Bank 1))


    1. Disconnect the C89 nozzle vane position sensor (for Bank 1) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Table 12. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    4. Reconnect the C89 nozzle vane position sensor (for Bank 1) connector.


  13. Click here

    CHECK MIL (NOZZLE VANE POSITION SENSOR (for Bank 2))


    1. Disconnect the z66 nozzle vane position sensor (for Bank 2) connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

      Table 13. Result
      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    4. Reconnect the z66 nozzle vane position sensor (for Bank 2) connector.


  14. Click here

    CHECK HARNESS AND CONNECTOR


    1. Disconnect the throttle position sensor (for Bank 1) connector.

    2. Disconnect the throttle position sensor (for Bank 2) connector.

    3. Disconnect the No. 1 EGR valve connector.

    4. Disconnect the No. 2 EGR valve connector.

    5. Disconnect the accelerator pedal position sensor connector.

    6. Disconnect the manifold absolute pressure sensor connector.

    7. Disconnect the fuel pressure sensor connector.

    8. Disconnect the differential pressure sensor assembly (for Bank 1) connector.

    9. Disconnect the differential pressure sensor assembly (for Bank 2) connector.

    10. Disconnect the nozzle vane position sensor (for Bank 1) connector.

    11. Disconnect the nozzle vane position sensor (for Bank 2) connector.

    12. A015C0EE15

      Disconnect the ECM connectors.

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

      Standard Resistance (Check for Short)
      Table 14. for LHD
      Tester Connection Condition Specified Condition
      C45-91 (VC) - Body ground Always 10 kΩ or higher
      C45-110 (VCVL) - Body ground Always 10 kΩ or higher
      C45-118 (VCM) - Body ground Always 10 kΩ or higher
      C45-120 (VNVC) - Body ground Always 10 kΩ or higher
      C45-66 (VCPM) - Body ground Always 10 kΩ or higher
      A38-55 (VCPA) - Body ground Always 10 kΩ or higher
      A38-56 (VCP2) - Body ground Always 10 kΩ or higher
      Table 15. for RHD
      Tester Connection Condition Specified Condition
      C46-91 (VC) - Body ground Always 10 kΩ or higher
      C46-110 (VCVL) - Body ground Always 10 kΩ or higher
      C46-118 (VCM) - Body ground Always 10 kΩ or higher
      C46-120 (VNVC) - Body ground Always 10 kΩ or higher
      C46-66 (VCPM) - Body ground Always 10 kΩ or higher
      A52-55 (VCPA) - Body ground Always 10 kΩ or higher
      A52-56 (VCP2) - Body ground Always 10 kΩ or higher

    14. Reconnect the throttle position sensor (for Bank 1) connector.

    15. Reconnect the throttle position sensor (for Bank 2) connector.

    16. Reconnect the No. 1 EGR valve connector.

    17. Reconnect the No. 2 EGR valve connector.

    18. Reconnect the accelerator pedal position sensor connector.

    19. Reconnect the manifold absolute pressure sensor connector.

    20. Reconnect the fuel pressure sensor connector.

    21. Reconnect the differential pressure sensor assembly (for Bank 1) connector.

    22. Reconnect the differential pressure sensor assembly (for Bank 2) connector.

    23. Reconnect the nozzle vane position sensor (for Bank 1) connector.

    24. Reconnect the nozzle vane position sensor (for Bank 2) connector.

    25. Reconnect the ECM connectors.


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    END

  16. Click here

    GO TO MIL CIRCUITClick here

  17. Click here

    REPLACE DIESEL THROTTLE BODY ASSEMBLY (for Bank 1)Click here

  18. Click here

    REPLACE DIESEL THROTTLE BODY ASSEMBLY (for Bank 2)Click here

  19. Click here

    REPLACE NO. 1 EGR VALVE ASSEMBLYClick here

  20. Click here

    REPLACE NO. 2 EGR VALVE ASSEMBLYClick here

  21. Click here

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLYClick here

  22. Click here

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSORClick here

  23. Click here

    REPLACE COMMON RAIL (for Bank 1)Click here

  24. Click here

    REPLACE DIFFERENTIAL PRESSURE SENSOR (for Bank 1)Click here

  25. Click here

    REPLACE DIFFERENTIAL PRESSURE SENSOR (for Bank 2)Click here

  26. Click here

    REPLACE TURBOCHARGER SUB-ASSEMBLY (for Bank 1)Click here

  27. Click here

    REPLACE TURBOCHARGER SUB-ASSEMBLY (for Bank 2)Click here

  28. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  29. Click here

    REPLACE ECMClick here