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 master cylinder solenoid (skid control ECU) is detected while the cruise control is in operation, the ECM determines there to be a momentary interruption and noise, and outputs a DTC.

DTC Code 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 sensor

  • Vehicle speed sensor signal circuit

  • ECM

  • Combination meter

INSPECTION PROCEDURE

This DTC code may be output under 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. Using the intelligent tester, enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Code.

    2. Check for DTCs Click here.

      OK
      DTC is not output.

    NG

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    OK

  2. CHECK DTC (CRUISE CONTROL SYSTEM)


    1. Using the intelligent tester, enter the following menus: Powertrain / Cruise Control / Trouble Code.

    2. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.


      1. Drive the vehicle at a speed of 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

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

    4. Check for DTCs Click here.

      OK
      DTC P0503 is not output.
      Result
      Result Proceed to
      OK A
      NG (for 1UR-FE) B
      NG (for 3UR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    USE SIMULATION METHOD TO CHECK Click here