ECD SYSTEM(w/ DPF), Diagnostic DTC:P0502, P0503

DTC Code DTC Name
P0502 Vehicle Speed Sensor "A" Circuit Low
P0503 Vehicle Speed Sensor "A" Intermittent / Erratic / High

DESCRIPTION

Refer to DTC P0500 Click here.

P0502
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Vehicle is driven with engine at high load

No vehicle speed sensor signal to ECM

(2 trip detection logic)

  • Open or short in speed signal circuit

  • Combination meter assembly

  • ECM
P0503
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Vehicle is driven with engine at high load

Vehicle speed exceeds threshold

(2 trip detection logic)

  • Open or short in speed signal circuit

  • Combination meter assembly

  • ECM
Related Data List
DTC No. Data List
P0502 Vehicle Speed
P0503

WIRING DIAGRAM

Refer to DTC P0500 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 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. READ VALUE USING GTS (VEHICLE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Vehicle Speed.

    5. Drive the vehicle.

    6. Read the value displayed on the GTS.

      OK
      Vehicle speeds displayed on the GTS and the speedometer display are equal.

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK COMBINATION METER SYSTEM


    1. Inspect the circuit that send vehicle speed signals to this system in the meter system Click here.


    NEXT

  3. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

    6. Start the engine.

    7. Drive the vehicle with the engine at high load and in high gear.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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

    9. Confirm that the DTC is not output again.

      Tech Tips

      If no DTCs (no pending DTCs) are output to the tester, the repair has been successfully completed.


    NEXT

    END