CRUISE CONTROL SYSTEM, Diagnostic DTC:P0503

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 controlling vehicle speed, the ECM determines that there is a momentary interruption or noise, and stores a DTC.

WIRING DIAGRAM

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 FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

   
   

   1. Connect the Techstream to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the Techstream on.

   4. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.

   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 FOR DTCs (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 the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

   3. Check for DTCs Click here.

      Result
      Result Proceed to DTC is not output A DTC P0503 is output (for 2AR-FE) B DTC P0503 is output (for 2GR-FE) C

   
   

   B

   REPLACE ECM Click here

   C

   REPLACE ECM Click here

   A

   END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)