ECD SYSTEM(for Swirl Control Valve), Diagnostic DTC:P0641

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

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

P0641

Power voltages (5 V as standard) supplied from ECM to throttle position sensor, accelerator pedal position sensor, turbo pressure sensor assembly and crankshaft position sensor, nozzle vane position sensor, fuel filter* are lower or higher than appropriate thresholds.

(1 trip detection logic)

  • Diesel throttle body assembly (throttle position sensor)

  • Open or short in diesel throttle position sensor circuit

  • Accelerator pedal sensor assembly

  • Open or short in accelerator pedal sensor circuit

  • Turbo pressure sensor assembly

  • Open or short in turbo pressure sensor assembly circuit

  • Crankshaft position sensor

  • Open or short in crankshaft position sensor circuit

  • Nozzle vane position sensor (turbocharger sub-assembly)

  • Open or short in nozzle vane position sensor (turbocharger sub-assembly) circuit

  • Fuel filter assembly circuit*

  • Open or short in fuel filter assembly circuit*

  • ECM

*: w/o FUEL FILTER relay

WIRING DIAGRAM

Refer to DTC P0122 (Click here).

Refer to DTC P2122 (Click here).

Refer to DTC P0236 (Click here).

Refer to DTC P0335 (Click here).

Refer to DTC P2564 (Click here).

Figure 1. for w/o FUEL FILTER relay
A342521E01

CAUTION / NOTICE / HINT

Note:

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

Tip:

  • 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 DTC OUTPUT

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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

    4. Read the DTCs.

      OK

      DTCs related to open or short circuits in the diesel throttle position sensor, accelerator pedal position sensor, turbo pressure sensor assembly, crankshaft position sensor and nozzle vane position sensor are not detected.

    Table 1. Result

    Result

    Proceed to

    OK (w/o FUEL FILTER relay)

    A

    OK (w/ FUEL FILTER relay)

    B

    NG

    C

    REPLACE ECMClick here

    GO TO DTC CHART

    (Click here)

  2. CHECK HARNESS AND CONNECTOR (FUEL FILTER ASSEMBLY - ECM)

    1. Disconnect the fuel filter 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

      A72-3 (VPFL) or A76-54 (VPFL) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

  3. CHECK FUEL FILTER ASSEMBLY

    1. Disconnect the fuel filter assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A72-3 (VPFL) - Body ground

      Always

      10 kΩ or higher

    REPLACE ECMClick here

    REPLACE FUEL FILTER ASSEMBLYClick here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. REPLACE FUEL FILTER ASSEMBLY

    1. Replace the fuel filter assembly (Click here).

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. REPLACE ECM

    1. Replace the ECM (Click here).

  7. 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 (Click here).

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Confirm that the DTC is not output again.

    END