СИСТЕМА ECD, Diagnostic DTC:P0641

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

DESCRIPTION

Refer to DTC P0236 Click here, DTC P1120 Click here and DTC P2454 Click here.

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

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

(1 trip detection logic)

  • Accelerator pedal assembly

  • Open or short in accelerator pedal position sensor circuit

  • Turbo pressure sensor

  • Open or short in turbo pressure sensor circuit

  • Differential pressure sensor

  • Open or short in differential pressure sensor circuit

  • ECM

WIRING DIAGRAM

Refer to DTC P0236 Click here, DTC P1120 Click here and DTC P2454 Click here.

INSPECTION PROCEDURE

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 initializations/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 POSITION SENSOR - ECM)


    1. A011ABTE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accelerator Pedal Position Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the accelerator pedal 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
      A33-4 (VCPA) or A19-56 (VCPA) - Body ground Always 10 kΩ or higher
      A33-6 (VPA) or A19-55 (VPA) - Body ground Always 10 kΩ or higher
      A33-5 (EPA) or A19-57 (EPA) - Body ground Always 10 kΩ or higher
      A33-1 (VCP2) or A19-53 (VCP2) - Body ground Always 10 kΩ or higher
      A33-3 (VPA2) or A19-52 (VPA2) - Body ground Always 10 kΩ or higher
      A33-2 (EPA2) or A19-54 (EPA2) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. INSPECT ECM (VC VOLTAGE)


    1. A011AY5E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accelerator Pedal Position Sensor)

      Disconnect the accelerator pedal 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
      A33-4 (VCPA) - A33-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A33-1 (VCP2) - A33-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the accelerator pedal position sensor connector.


    NG

    REPLACE ECM Click here

    OK

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


    1. A0117QLE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Differential Pressure Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      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 (Check for Short)
      Tester Connection Condition Specified Condition
      A39-2 (PEX) or A19-32 (PEX) - Body ground Always 10 kΩ or higher
      A39-3 (VC) or A19-33 (VCPX) - Body ground Always 10 kΩ or higher
      A39-1 (E2) or A19-34 (EPEX) - Body ground Always 10 kΩ or higher

    4. Reconnect the differential pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. INSPECT ECM (VC VOLTAGE)


    1. A011AUFE16
      Text in Illustration
      *1

      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
      A39-3 (VC) - A39-1 (E2) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the differential pressure sensor connector.


    NG

    REPLACE ECM Click here

    OK

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


    1. A0117QLE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Turbo Pressure Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the turbo 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
      A34-2 (PIM) or A19-13 (PIM) - Body ground Always 10 kΩ or higher
      A34-3 (VC) or A19-14 (VPIM) - Body ground Always 10 kΩ or higher
      A34-1 (E) or A19-15 (EPIM) - Body ground Always 10 kΩ or higher

    4. Reconnect the turbo pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. INSPECT ECM (VC VOLTAGE)


    1. A011AUFE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Turbo Pressure Sensor)

      Disconnect the 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
      A34-3 (VC) - A34-1 (E) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the turbo pressure sensor connector.


    NG

    REPLACE ECM Click here

    OK

  7. REPLACE TURBO PRESSURE SENSOR


    1. Replace the turbo pressure sensor Click here.


    NEXT

  8. 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
      P0641 B

    B

    REPLACE DIFFERENTIAL PRESSURE SENSOR Click here

    A

    END

  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 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
      P0641 B

    B

    REPLACE ACCELERATOR PEDAL ASSEMBLY Click here

    A

    END

  11. REPLACE ACCELERATOR PEDAL ASSEMBLY


    1. Replace the accelerator pedal 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 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