P0503

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

DTC 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.






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)
(a) Using the Techstream, enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Code.
(b) Check for DTCs.
OK:
DTC is not output.
NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM (DTC CHART)
OK -- Continue to next step.
2. CHECK DTC (CRUISE CONTROL SYSTEM)
(a) Using the Techstream, enter the following menus: Powertrain / Cruise Control / Trouble Code.
(b) Clear the DTC.
(c) 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 45 km/h (28 mph) or more.
(2) Turn the cruise control main switch on.
(3) Push the -SET switch to activate the cruise control.
(d) Check for DTCs.
OK:
DTC P0503 is not output.
NG -- REPLACE ECM
OK -- USE SIMULATION METHOD TO CHECK