P0503

CRUISE CONTROL: CRUISE CONTROL SYSTEM: P0503: Vehicle Speed Sensor Circuit Malfunction
P0503 - Vehicle Speed Sensor Circuit Malfunction

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 cruise control is in operation, the ECM determines there to be a momentary interruption or noise and stores a DTC.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

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

OK:

Vehicle stability control system DTCs are not output.

NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK FOR DTC

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

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

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

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

(2) Turn the cruise control main switch on.

(3) Push the cruise control main switch to -SET to activate cruise control.

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

OK:

DTC P0503 is not output.

NG -- GO TO SFI SYSTEM How to Proceed with Troubleshooting

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting