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

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

DESCRIPTION

Refer to DTC P0236 Click here.

Refer to DTC P2122 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 and turbo pressure sensor are lower or higher than appropriate thresholds.

(1 trip detection logic)

  • Accelerator pedal sensor assembly

  • Open or short in accelerator pedal position sensor circuit

  • Diesel turbo pressure sensor

  • Open or short in diesel turbo pressure sensor circuit

  • Open or short in differential pressure sensor circuit

  • ECM

WIRING DIAGRAM

Refer to DTC P0236 Click here.

Refer to DTC P2122 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 (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM)


    1. Disconnect the accelerator pedal sensor 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
      A36-4 (VCPA) or A59-56 (VCPA) - Body ground Always 10 kΩ or higher
      A36-6 (VPA) or A59-55 (VPA) - Body ground Always 10 kΩ or higher
      A36-5 (EPA) or A59-57 (EPA) - Body ground Always 10 kΩ or higher
      A36-1 (VCP2) or A59-53 (VCP2) - Body ground Always 10 kΩ or higher
      A36-3 (VPA2) or A59-52 (VPA2) - Body ground Always 10 kΩ or higher
      A36-2 (EPA2) or A59-54 (EPA2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. A01VHDEE01
      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 (DIESEL TURBO PRESSURE SENSOR - ECM)


    1. Disconnect the diesel turbo 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
      B49-2 (PIM) or A59-13 (PIM) - Body ground Always 10 kΩ or higher
      B49-3 (VC) or A59-14 (VPIM) - Body ground Always 10 kΩ or higher
      B49-1 (E) or A59-15 (EPIM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. A01VJR7E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Diesel 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

  5. REPLACE DIESEL TURBO PRESSURE SENSOR


    1. Replace the diesel turbo pressure sensor Click here.


    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P0641)


    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
      DTC P0641 B

    A

    END

    B

  7. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  9. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  10. 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