СИСТЕМА ECD (для моделей с контроллером свечей накаливания), Diagnostic DTC:P0641

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

DESCRIPTION

Refer to DTC P0107.

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Click here

Refer to DTC P2122.

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Refer to DTC P2454.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0641 Sensor Reference Voltage "A" Circuit / Open

Supplied power (standard: 5 V) from the ECM to the accelerator pedal sensor, diesel turbo pressure sensor and differential pressure sensor are lower or higher than appropriate thresholds.

(1 trip detection logic)

  • Accelerator pedal sensor assembly (accelerator pedal position sensor)

  • Open or short in accelerator pedal position 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

 Comes on DTC stored
DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P0641 Ignition switch ON

WIRING DIAGRAM

Refer to DTC P0107.

Click here

Click here

Refer to DTC P2122.

Click here

Refer to DTC P2454.

Click here

CAUTION / NOTICE / HINT

Note

When replacing the ECM, perform ECM Initialization and Registration.

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 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 (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
      A3-4 (VCPA) or A169-27 (VCPA) - Body ground and other terminals Always 10 kΩ or higher
      A3-6 (VPA) or A169-42 (VPA) - Body ground and other terminals Always 10 kΩ or higher
      A3-5 (EPA) or A169-22 (EPA) - Body ground and other terminals Always 10 kΩ or higher
      A3-1 (VCP2) or A169-28 (VCP2) - Body ground and other terminals Always 10 kΩ or higher
      A3-3 (VPA2) or A169-43 (VPA2) - Body ground and other terminals Always 10 kΩ or higher
      A3-2 (EPA2) or A169-23 (EPA2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 13 Click here

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ACCELERATOR PEDAL SENSOR ASSEMBLY)

    B0044UHC01
    *a

    Front view of wire harness connector

    (to Accelerator Pedal Sensor Assembly)

    1. 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 Condition Specified Condition
      A3-4 (VCPA) - A3-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A3-1 (VCP2) - A3-2 (EPA2) Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 11 Click here

    OK

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


    1. Disconnect the differential 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
      B131-2 (PEX) or B212-86 (PEX) - Body ground and other terminals Always 10 kΩ or higher
      B131-3 (VC) or B212-71 (VCPX) - Body ground and other terminals Always 10 kΩ or higher
      B131-1 (E2) or B212-118 (EPEX) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 13 Click here

    OK

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF DIFFERENTIAL PRESSURE SENSOR)

    B0044COC04
    *a

    Front view of wire harness connector

    (to Differential Pressure Sensor)

    1. 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 Condition Specified Condition
      B131-3 (VC) - B131-1 (E2) Ignition switch ON 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 11 Click here

    OK

  5. 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
      B126-2 (PIM) or B212-78 (PIM) - Body ground and other terminals Always 10 kΩ or higher
      B126-3 (VC) or B212-63 (VPIM) - Body ground and other terminals Always 10 kΩ or higher
      B126-1 (E) or B212-110 (EPIM) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF DIESEL TURBO PRESSURE SENSOR)

    B0044COC05
    *a

    Front view of wire harness connector

    (to Diesel Turbo Pressure Sensor)

    1. 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 Condition Specified Condition
      B126-3 (VC) - B126-1 (E) Ignition switch ON 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  7. REPLACE DIESEL TURBO PRESSURE SENSOR


    1. Replace the diesel turbo pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0641)


    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 P0641 is output B

    A

    END

    B

  9. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK WHETHER DTC OUTPUT RECURS (DTC P0641)


    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 P0641 is output B

    A

    END

    B

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

  11. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 14 Click here

  12. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 14 Click here

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

  14. 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 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. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END