СИСТЕМА ECD 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.

A012JOSE23

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power through the VC circuit are deactivated 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 when the ignition switch is turned ON. The MIL goes off when the engine is started.

WIRING DIAGRAM

A012H5PE01
Table 1.
*a Accelerator Pedal Sensor Assembly
*b Diesel Throttle Body Assembly
*c Shielded
*d Fuel Pressure Sensor (Built into Common Rail Assembly)
A012KY7E01
A012H76E01
Table 2.
*a Camshaft Position Sensor
*b POP
*c Oil Pressure Sender Gauge Assembly
*d Nozzle Vane Position Sensor (Built into Turbocharger Sub-assembly)

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK MIL

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

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

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click hereНажмите здесь

    A

  2. CHECK COMMUNICATION BETWEEN GTS AND ECM

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and GTS on.

    3. Check the communication between the GTS and ECM.

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

    GO TO MIL CIRCUIT Click here Нажмите здесь

    A

  3. CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)

    1. Disconnect the accelerator pedal sensor 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 SENSOR ASSEMBLY Click hereНажмите здесь

    A

  4. 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.

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

    REPLACE DIESEL THROTTLE BODY ASSEMBLY Click hereНажмите здесь

    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 hereНажмите здесь

    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 hereНажмите здесь

    A

  7. CHECK MIL (DIFFERENTIAL PRESSURE SENSOR ASSEMBLY)

    1. Disconnect the differential pressure sensor 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 DIFFERENTIAL PRESSURE SENSOR ASSEMBLY Click hereНажмите здесь

    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 Click hereНажмите здесь

    A

  9. CHECK MIL (CAMSHAFT POSITION SENSOR)

    1. Disconnect the camshaft 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 CAMSHAFT POSITION SENSOR Click hereНажмите здесь

    A

  10. 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.

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

    REPLACE OIL PRESSURE SENDER GAGE ASSEMBLY Click hereНажмите здесь

    A

  11. 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 hereНажмите здесь

    A

  12. CHECK HARNESS AND CONNECTOR

    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Disconnect the diesel throttle body assembly connector.

    3. Disconnect the fuel pressure sensor connector.

    4. Disconnect the electric EGR control valve assembly connector.

    5. Disconnect the differential pressure sensor assembly connector.

    6. Disconnect the manifold absolute pressure sensor connector.

    7. Disconnect the camshaft position sensor connector.

    8. Disconnect the oil pressure sender gauge assembly connector.

    9. Disconnect the nozzle vane position sensor connector.

    10. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A118-55 (VCPA) - Body ground Always 10 kΩ or higher
      A118-57 (VCP2) - Body ground Always 10 kΩ or higher
      B164-97 (VCVL) - Body ground Always 10 kΩ or higher
      B164-68 (VCM) - Body ground Always 10 kΩ or higher
      B164-69 (VCS) - Body ground Always 10 kΩ or higher
      B164-94 (VCEG) - Body ground Always 10 kΩ or higher
      B164-75 (VCPM) - Body ground Always 10 kΩ or higher
      B164-78 (VCG) - Body ground Always 10 kΩ or higher
      B164-93 (VPOP) - Body ground Always 10 kΩ or higher
      B164-101 (VNVC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG
    OK

    REPLACE ECM Click hereНажмите здесь

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR