P0503

CRUISE CONTROL: CRUISE CONTROL SYSTEM: P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High
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 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)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.

(e) Check for DTCs.

Result:





B -- GO TO VEHICLE STABILITY CONTROL SYSTEM (DTC CHART) Vehicle Stability Control System
A -- Continue to next step.

2. REPLACE COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly Removal.

NEXT -- Continue to next step.

3. CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT
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.

(c) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE ECM Removal

C -- REPLACE ECM Removal

A -- END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)