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ECD SYSTEM(w/o EGR Cooler) VC Output Circuit

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DTC Code DTC Name
  VC Output Circuit
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DESCRIPTION

The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.

When the VC circuit has a short circuit, the CPU in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.

B00267IE02
B0024B0E01
Table 1. *a Accelerator Pedal Position Sensor (Accelerator Pedal Sensor Assembly) *b Fuel Pressure Sensor *c Diesel Throttle Body Assembly
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WIRING DIAGRAM


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CAUTION / NOTICE / HINT

Note:

  • Check the fuses for circuits related to this system before performing the following inspection procedure.

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

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PROCEDURE


  1. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is not possible A
      Communication is possible B

  2. *a Component with harness connected (to ECM)
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    CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)


    1. Turn the ignition switch to ON.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G86-2 (+B) - Body ground Ignition switch ON 11 to 14 V
      G86-3 (+B2) - Body ground Ignition switch ON 11 to 14 V
      G86-4 (+B3) - Body ground Ignition switch ON 11 to 14 V
      Tip:

      If the result is not as specified, since current is not flowing to the +B, +B2 and +B3 terminals of the ECM, the system may not be started.

      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR)


    1. Disconnect the camshaft position sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the camshaft position sensor connector.


  4. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (MANIFOLD ABSOLUTE PRESSURE SENSOR)


    1. Disconnect the manifold absolute pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the manifold absolute pressure sensor connector.


  5. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY)


    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the mass air flow meter sub-assembly connector.


  6. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (NOZZLE VANE POSITION SENSOR)


    1. Disconnect the nozzle vane position sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the nozzle vane position sensor connector.


  7. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (ELECTRIC EGR CONTROL VALVE ASSEMBLY)


    1. Disconnect the electric EGR control valve assembly connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the electric EGR control valve assembly connector.


  8. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (ACCELERATOR PEDAL POSITION SENSOR)


    1. Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the accelerator pedal position sensor connector.


  9. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR)


    1. Disconnect the fuel pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the fuel pressure sensor connector.


  10. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (DIESEL THROTTLE BODY ASSEMBLY)


    1. Disconnect the diesel throttle body assembly connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the diesel throttle body assembly connector.


  11. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (CRANKSHAFT POSITION SENSOR)


    1. Disconnect the crankshaft position sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is not possible B

    5. Reconnect the crankshaft position sensor connector.


  12. Click here

    CHECK CONNECTION BETWEEN GTS AND ECM (CLUTCH STROKE SENSOR)


    1. Disconnect the clutch stroke sensor connector.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check the communication between the GTS and ECM.

      Tip:

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to
      Communication is possible A
      Communication is notpossible B

    5. Reconnect the clutch stroke sensor connector.


  13. Click here

    CHECK HARNESS AND CONNECTOR


    1. Disconnect the camshaft position sensor connector.

    2. Disconnect the manifold absolute pressure sensor connector.

    3. Disconnect the mass air flow meter sub-assembly connector.

    4. Disconnect the nozzle vane position sensor connector.

    5. Disconnect the electric EGR control valve assembly connector.

    6. Disconnect the accelerator pedal sensor assembly connector.

    7. Disconnect the fuel pressure sensor connector.

    8. Disconnect the diesel throttle body assembly connector.

    9. Disconnect the crankshaft position sensor connector.

    10. Disconnect the clutch stroke sensor connector.

    11. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G86-29 (VCPA) - Body ground and other terminals Always 10 kΩ or higher
      G86-30 (VCP2) - Body ground and other terminals Always 10 kΩ or higher
      C59-28 (VCM) - Body ground and other terminals Always 10 kΩ or higher
      C60-33 (VCS) - Body ground and other terminals Always 10 kΩ or higher
      C59-29 (VCVL) - Body ground and other terminals Always 10 kΩ or higher
      C59-31 (VCEG) - Body ground and other terminals Always 10 kΩ or higher
      C57-28 (VCPM) - Body ground and other terminals Always 10 kΩ or higher
      C59-30 (VNVC) - Body ground and other terminals Always 10 kΩ or higher
      C58-25 (VCVG) - Body ground and other terminals Always 10 kΩ or higher
      C60-17 (VCG) - Body ground and other terminals Always 10 kΩ or higher
      C60-20 (VCNE) - Body ground and other terminals Always 10 kΩ or higher
      G86-23 (VCCL) - Body ground and other terminals Always 10 kΩ or higher
      G86-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      G86-3 (+B2) - Body ground and other terminals Always 10 kΩ or higher
      G86-4 (+B3) - Body ground and other terminals Always 10 kΩ or higher

    13. Reconnect the clutch stroke sensor connector.

    14. Reconnect the crankshaft position sensor connector.

    15. Reconnect the electric EGR control valve assembly connector.

    16. Reconnect the diesel throttle body assembly connector.

    17. Reconnect the fuel pressure sensor connector.

    18. Reconnect the accelerator pedal sensor assembly connector.

    19. Reconnect the nozzle vane position sensor connector.

    20. Reconnect the mass air flow meter sub-assembly connector.

    21. Reconnect the manifold absolute pressure sensor connector.

    22. Reconnect the camshaft position sensor connector.

    23. Reconnect the ECM connectors.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR