ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P0651

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

DESCRIPTION

Refer to DTC P0192.

Click here

Refer to DTC P0400.

Click here

Refer to DTC P2564.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0651

Sensor Reference Voltage "B" Circuit / Open

Supplied power (standard: 5 V) from the ECM to the nozzle vane position sensor, fuel pressure sensor and EGR valve position sensor are lower or higher than threshold.

(1 trip detection logic)

  • Nozzle vane position sensor (turbocharger sub-assembly)

  • Open or short in nozzle vane position sensor (turbocharger sub-assembly) circuit

  • Fuel pressure sensor (common rail assembly)

  • Open or short in fuel pressure sensor (common rail assembly) circuit

  • EGR valve position sensor (electric EGR control valve assembly)

  • Open or short in EGR valve position sensor circuit

  • ECM

Comes on

DTC stored
Table 1. DTC Detection Drive Pattern

DTC No.

DTC Detection Drive Pattern

P0651

Ignition switch ON

WIRING DIAGRAM

Refer to DTC P0192.

Click here

Refer to DTC P0403.

Click here

Refer to DTC P2564.

Click here

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, perform ECM Initialization and Registration.

Click here

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. 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

      Tester Connection

      Condition

      Specified Condition

      B133-3 (VTA1) or B212-82 (VTAI) - Body ground and other terminals

      Always

      10 kΩ or higher

      B133-1 (VNVC) or B212-67 (VNVC) - Body ground and other terminals

      Always

      10 kΩ or higher

      B133-2 (VNE2) or B212-114 (VNE2) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  2. CHECK TERMINAL VOLTAGE (VC VOLTAGE)

    A200304C03

    *a

    Front view of wire harness connector

    (to Nozzle Vane Position Sensor)

    1. 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

      Condition

      Specified Condition

      B133-1 (VNVC) - B133-2 (VNE2)

      Ignition switch ON

      4.5 to 5.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECMClick 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

      Tester Connection

      Condition

      Specified Condition

      B127-2 (PCR1) or B212-85 (PC) - Body ground and other terminals

      Always

      10 kΩ or higher

      B127-3 (VC1) or B212-70 (VCS) - Body ground and other terminals

      Always

      10 kΩ or higher

      B127-1 (E1) or B212-117 (E2S) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  4. CHECK TERMINAL VOLTAGE (VC VOLTAGE)

    A200302C03

    *a

    Front view of wire harness connector

    (to Fuel Pressure Sensor)

    1. 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

      Condition

      Specified Condition

      B127-3 (VC1) - B127-1 (E1)

      Ignition switch ON

      4.5 to 5.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECMClick here

    OK

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

    1. Disconnect the electric EGR control valve assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B134-5 (VC) or B212-64 (VCEG) - Body ground and other terminals

      Always

      10 kΩ or higher

      B134-4 (VTA) or B212-79 (EGLS) - Body ground and other terminals

      Always

      10 kΩ or higher

      B134-3 (E2) or B212-111 (EEGL) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  6. CHECK TERMINAL VOLTAGE (VC VOLTAGE)

    A200329C03

    *a

    Front view of wire harness connector

    (to Electric EGR Control Valve Assembly)

    1. Disconnect the electric EGR control 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

      Condition

      Specified Condition

      B134-5 (VC) - B134-3 (E2)

      Ignition switch ON

      4.5 to 5.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECMClick here

    OK

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

    1. Replace the turbocharger sub-assembly.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0651)

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON.

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

    7. Turn the ignition switch to ON and wait for 10 seconds or more.

    8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    9. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC P0651 is output

      B
    A

    END

    B

  9. REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

    1. Replace the common rail assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  10. BLEED AIR FROM FUEL SYSTEM

    1. Bleed the air from the fuel system.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0651)

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    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 / Trouble Codes.

    7. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC P0651 is output

      B
    A

    END

    B

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY (EGR VALVE POSITION SENSOR)Click here

  12. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

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

    1. Replace the electric EGR control valve assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result

    Proceed to

    NEXT
    NEXT

  15. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON.

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

    7. Turn the ignition switch to ON and wait for 10 seconds or more.

    8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    9. Confirm that the DTC is not output again.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END