ECD SYSTEM(w/o DPF) 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.

B0018GME44

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.

WIRING DIAGRAM


A01WWCME01
*a Throttle Position Sensor (for Bank 1) (Diesel Throttle Body)
*b Throttle Position Sensor (for Bank 2) (Diesel Throttle Body)
*c Accelerator Pedal Position Sensor (Accelerator Pedal)
A01WTS5E01
A01WTS4E01
*a Nozzle Vane Position Sensor (Turbocharger Sub-assembly (for Bank 1))
*b Nozzle Vane Position Sensor (Turbocharger Sub-assembly (for Bank 2))

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. 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.

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

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)


    1. Turn the engine switch on (IG).

      A01WWILE02

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A85-2 (+B) - C110-81 (E1) Engine switch on (IG) 11 to 14 V
      A85-1 (+B2) - C110-81 (E1) Engine switch on (IG) 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (ECM)

    NG

    GO TO ECM POWER SOURCE CIRCUIT

    OK

  3. CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR (for Bank 1))


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

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


    A

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

    B

  4. CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR (for Bank 2))


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

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


    A

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

    B

  5. CHECK CONNECTION BETWEEN GTS AND ECM (NO. 1 EGR VALVE POSITION SENSOR)


    1. Disconnect the No. 1 EGR valve connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the No. 1 EGR valve connector.


    A

    REPLACE NO. 1 EGR VALVE ASSEMBLY Click here

    B

  6. CHECK CONNECTION BETWEEN GTS AND ECM (NO. 2 EGR VALVE POSITION SENSOR)


    1. Disconnect the No. 2 EGR valve connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the No. 2 EGR valve connector.


    A

    REPLACE NO. 2 EGR VALVE ASSEMBLY Click here

    B

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


    1. Disconnect the accelerator pedal position sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the accelerator pedal position sensor connector.


    A

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLY Click here

    B

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


    1. Disconnect the manifold absolute pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the manifold absolute pressure sensor connector.


    A

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Click here

    B

  9. CHECK CONNECTION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR)


    1. Disconnect the fuel pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

    4. Reconnect the fuel pressure sensor connector.


    A

    REPLACE COMMON RAIL (for Bank 1) Click here

    B

  10. CHECK CONNECTION BETWEEN GTS AND ECM (NOZZLE VANE POSITION SENSOR (for Bank 1))


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

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


    A

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

    B

  11. CHECK CONNECTION BETWEEN GTS AND ECM (NOZZLE VANE POSITION SENSOR (for Bank 2))


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

    2. Turn the engine switch on (IG).

    3. Check the MIL.

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

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


    A

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

    B

  12. 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 nozzle vane position sensor (for Bank 1) connector.

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

    10. Disconnect the ECM connectors.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C110-91 (VC) - Body ground Always 10 kΩ or higher
      C110-110 (VCVL) - Body ground Always 10 kΩ or higher
      C110-118 (VCM) - Body ground Always 10 kΩ or higher
      C110-120 (VNVC) - Body ground Always 10 kΩ or higher
      C110-66 (VCPM) - Body ground Always 10 kΩ or higher
      A85-55 (VCPA) - Body ground Always 10 kΩ or higher
      A85-56 (VCP2) - Body ground Always 10 kΩ or higher

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

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

    14. Reconnect the No. 1 EGR valve connector.

    15. Reconnect the No. 2 EGR valve connector.

    16. Reconnect the accelerator pedal position sensor connector.

    17. Reconnect the manifold absolute pressure sensor connector.

    18. Reconnect the fuel pressure sensor connector.

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

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

    21. Reconnect the ECM connectors.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR