DTC    P0641    Sensor Reference Voltage "A" Circuit / Open

for Preparation Click here


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)
  1. Accelerator pedal assembly
  2. Open or short in accelerator pedal position sensor circuit
  3. Turbo pressure sensor
  4. Open or short in turbo pressure sensor circuit
  5. Differential pressure sensor
  6. Open or short in differential pressure sensor circuit
  7. ECM

WIRING DIAGRAM

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

INSPECTION PROCEDURE

NOTICE:
When replacing the ECM, the ECM needs Registration and Initialization (Click here).

HINT:
  1. 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.
  2. 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.

1.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)


    A200290E01

  1. Disconnect the accelerator pedal position sensor connector.

  1. Disconnect the ECM connector.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Accelerator Pedal Position Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the accelerator pedal position sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 12
OK


2.INSPECT ECM (VC VOLTAGE)


    A200311E02

  1. Disconnect the accelerator pedal position sensor connector.

  1. Turn the ignition switch to ON.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Accelerator Pedal Position Sensor)

  1. Reconnect the accelerator pedal position sensor connector.



NG
Go to step 13
OK


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


    A199023E02

  1. Disconnect the differential pressure sensor connector.

  1. Disconnect the ECM connector.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Differential Pressure Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the differential pressure sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 12
OK


4.INSPECT ECM (VC VOLTAGE)


    A200310E16

  1. Disconnect the differential pressure sensor connector.

  1. Turn the ignition switch to ON.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Differential Pressure Sensor)

  1. Reconnect the differential pressure sensor connector.



NG
Go to step 13
OK


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


    A199023E01

  1. Disconnect the turbo pressure sensor connector.

  1. Disconnect the ECM connector.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Turbo Pressure Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the turbo pressure sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 12
OK


6.INSPECT ECM (VC VOLTAGE)


    A200310E01

  1. Disconnect the turbo pressure sensor connector.

  1. Turn the ignition switch to ON.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Turbo Pressure Sensor)

  1. Reconnect the turbo pressure sensor connector.



NG
Go to step 13
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.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear the DTCs (Click here).

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

  1. Turn the ignition switch to ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTC.
    Result 
    Result
    		Proceed to
    No DTC output
    		A
    P0641
    		B



B
Go to step 9
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.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear the DTCs (Click here).

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

  1. Turn the ignition switch to ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTC.
    Result 
    Result
    		Proceed to
    No DTC output
    		A
    P0641
    		B



B
Go to step 11
A

END 

11.REPLACE ACCELERATOR PEDAL ASSEMBLY

  1. Replace the accelerator pedal assembly (Click here).



NEXT
Go to step 14

12.REPAIR OR REPLACE HARNESS OR CONNECTOR


NEXT
Go to step 14

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.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear the DTCs (Click here).

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

  1. Turn the ignition switch to ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END