CRUISE CONTROL SYSTEM, Diagnostic DTC:P0503

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

DESCRIPTION

If a malfunction (a rapid change in vehicle speed) in the vehicle speed signal being output from the skid control ECU is detected while the cruise control is in operation, the ECM determines that there is a momentary interruption or noise, and outputs a DTC.

DTC DTC Detection Condition Trouble Area
P0503 A momentary interruption and noise are detected when a rapid change of the vehicle speed occurs while cruise control is in operation.

  • Vehicle speed sensors

  • Vehicle speed sensor signal circuit

  • Combination meter assembly

  • ECM

WIRING DIAGRAM

A01ELJCE01

INSPECTION PROCEDURE

This DTC may be output by the vehicle stability control system at the same time. In that case, perform troubleshooting for the vehicle stability control system first.

PROCEDURE


  1. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / DTC.

    5. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM (DTC CHART) Click here

    A

  2. REPLACE COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly Click here.


    NEXT

  3. CHECK DTC (CRUISE CONTROL SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive at the required speed of between 40 km/h (25 mph) and 200 km/h (125 mph).

      2. Turn the cruise control main switch on.

      3. Push the -SET switch to activate the cruise control.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0503 is output B

    B

    REPLACE ECM Click here

    A

    END