ECD SYSTEM, Diagnostic DTC:P0651

DTC Code DTC Name
P0651 Sensor Reference Voltage "B" Circuit / Open

DESCRIPTION

Refer to DTC P0192 (See page ), DTC P0405 (See page ) and DTC P2564 Click here.

P0651
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch is ON

Power voltage (5 V as standard) supplied from ECM to nozzle vane position sensor, fuel pressure sensor and EGR valve position sensor are lower or higher than threshold.

(1 trip detection logic)

  • Turbocharger sub-assembly (nozzle vane position sensor)

  • Open or short in nozzle vane position sensor circuit

  • Common rail assembly (fuel pressure sensor)

  • Open or short in fuel pressure sensor circuit

  • Electric EGR valve assembly (EGR valve position sensor)

  • Open or short in EGR valve position sensor circuit

  • ECM

WIRING DIAGRAM

Refer to DTC P0192 (See page ), DTC P0405 (See page ) and DTC P2564 Click here.

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (NOZZLE VANE POSITION SENSOR - ECM)


    1. Disconnect the nozzle vane position sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B36-3 (VTA1) or B21-38 (VTA1) - Body ground Always 10 kΩ or higher
      B36-1 (VNVC) or B21-37 (VNVC) - Body ground Always 10 kΩ or higher
      B36-2 (VNE2) or B21-36 (VNE2) - Body ground Always 10 kΩ or higher

    4. Reconnect the nozzle vane position sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. INSPECT ECM (VC VOLTAGE)


    1. A005KI6E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Nozzle Vane Position Sensor)

      Disconnect the nozzle vane position sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B36-1 (VNVC) - B36-2 (VNE2) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the nozzle vane position sensor connector.


    NG

    REPLACE ECM Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)


    1. Disconnect the fuel pressure sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B34-2 (PCR1) or B21-16 (PC) - Body ground Always 10 kΩ or higher
      B34-3 (VC1) or B21-15 (VCS) - Body ground Always 10 kΩ or higher
      B34-1 (E1) or B21-14 (E2S) - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. INSPECT ECM (VC VOLTAGE)


    1. A005IXQE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Pressure Sensor)

      Disconnect the fuel pressure sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B34-3 (VC1) - B34-1 (E1) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the fuel pressure sensor connector.


    NG

    REPLACE ECM Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ELECTRIC EGR VALVE ASSEMBLY - ECM)


    1. Disconnect the electric EGR valve assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B55-5 (VC) or B21-26 (VCEG) - Body ground Always 10 kΩ or higher
      B55-4 (VTA) or B21-27 (EGLS) - Body ground Always 10 kΩ or higher
      B55-3 (E2) or B21-25 (EEGL) - Body ground Always 10 kΩ or higher

    4. Reconnect the electric EGR valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. INSPECT ECM (VC VOLTAGE)


    1. A005IDLE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric EGR Valve Assembly)

      Disconnect the electric EGR valve assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B55-5 (VC) - B55-3 (E2) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the electric EGR valve assembly connector.


    NG

    REPLACE ECM Click here

    OK

  7. REPLACE TURBOCHARGER SUB-ASSEMBLY (NOZZLE VANE POSITION SENSOR)


    1. Replace the turbocharger sub-assembly Click here.


    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0651)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Read the DTC.

      Result
      Result Proceed to
      No DTC output A
      P0651 B

    A

    END

    B

  9. REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)


    1. Replace the common rail assembly Click here.


    NEXT

  10. BLEED AIR FROM FUEL SYSTEM


    1. Bleed air from fuel system Click here.


    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0651)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Read the DTC.

      Result
      Result Proceed to
      No DTC output A
      P0651 B

    A

    END

    B

  12. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY (EGR VALVE POSITION SENSOR)


    1. Replace the electric EGR valve assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  14. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  15. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Confirm that the DTC is not output again.


    NEXT

    END