ECD SYSTEM(w/ DPF), Diagnostic DTC:P0641

DTC Code DTC Name
P0641 Sensor Reference Voltage "A" Circuit / Open

DESCRIPTION

Refer to DTC P0107 Click here.

Refer to DTC P2122 Click here.

Refer to DTC P2454 Click here.

P0641
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON

Power voltages (5 V as standard) supplied from ECM to accelerator pedal position sensor, diesel turbo pressure sensor and differential pressure sensor are lower or higher than appropriate thresholds.

(1 trip detection logic)

  • Accelerator pedal sensor assembly

  • Open or short in accelerator pedal sensor circuit

  • Diesel turbo pressure sensor

  • Open or short in diesel turbo pressure sensor circuit

  • Differential pressure sensor

  • Open or short in differential pressure sensor circuit

  • ECM

WIRING DIAGRAM

Refer to DTC P0107 Click here.

Refer to DTC P2122 Click here.

Refer to DTC P2454 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 GTS. 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 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 (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM)


    1. Disconnect the A36 accelerator pedal sensor assembly connector.

    2. Disconnect the A108 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-4 (VCPA) or A108-27 (VCPA) - Body ground Always 10 kΩ or higher
      A36-6 (VPA) or A108-42 (VPA) - Body ground Always 10 kΩ or higher
      A36-5 (EPA) or A108-22 (EPA) - Body ground Always 10 kΩ or higher
      A36-1 (VCP2) or A108-28 (VCP2) - Body ground Always 10 kΩ or higher
      A36-3 (VPA2) or A108-43 (VPA2) - Body ground Always 10 kΩ or higher
      A36-2 (EPA2) or A108-23 (EPA2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK TERMINAL VOLTAGE (VC VOLTAGE)


    1. A01VI4PE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Accelerator Pedal Sensor Assembly)

      Disconnect the accelerator pedal sensor 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
      A36-4 (VCPA) - A36-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A36-1 (VCP2) - A36-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

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


    1. Disconnect the B43 differential pressure sensor connector.

    2. Disconnect the B104 ECM connector (for LHD).

    3. Disconnect the B103 ECM connector (for RHD).

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B43-2 (PEX) or B104-86 (PEX) - Body ground Always 10 kΩ or higher
      B43-3 (VC) or B104-71 (VCPX) - Body ground Always 10 kΩ or higher
      B43-1 (E2) or B104-118 (EPEX) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B43-2 (PEX) or B103-86 (PEX) - Body ground Always 10 kΩ or higher
      B43-3 (VC) or B103-71 (VCPX) - Body ground Always 10 kΩ or higher
      B43-1 (E2) or B103-118 (EPEX) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. CHECK TERMINAL VOLTAGE (VC VOLTAGE)


    1. A01VI6SE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Differential Pressure Sensor)

      Disconnect the differential 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
      B43-3 (VC) - B43-1 (E2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (DIESEL TURBO PRESSURE SENSOR - ECM)


    1. Disconnect the B49 diesel turbo pressure sensor connector.

    2. Disconnect the B104 ECM connector (for LHD).

    3. Disconnect the B103 ECM connector (for RHD).

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B49-2 (PIM) or B104-78 (PIM) - Body ground Always 10 kΩ or higher
      B49-3 (VC) or B104-63 (VPIM) - Body ground Always 10 kΩ or higher
      B49-1 (E) or B104-110 (EPIM) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B49-2 (PIM) or B103-78 (PIM) - Body ground Always 10 kΩ or higher
      B49-3 (VC) or B103-63 (VPIM) - Body ground Always 10 kΩ or higher
      B49-1 (E) or B103-110 (EPIM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. CHECK TERMINAL VOLTAGE (VC VOLTAGE)


    1. A01VHQYE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Turbo Pressure Sensor)

      Disconnect the diesel turbo 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
      B49-3 (VC) - B49-1 (E) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  7. REPLACE DIESEL TURBO PRESSURE SENSOR


    1. Replace the diesel turbo pressure sensor Click here.


    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0641)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

    6. Turn the ignition switch to ON.

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

    8. Read the DTC.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0641 is output B

    A

    END

    B

  9. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor Click here.


    NEXT

  10. CHECK WHETHER DTC OUTPUT RECURS (DTC P0641)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

    6. Turn the ignition switch to ON.

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

    8. Read the DTC.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0641 is output B

    A

    END

    B

  11. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  12. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  13. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  14. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

    6. Turn the ignition switch to ON.

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

    8. Confirm that the DTC is not output again.


    NEXT

    END