Code 0203

The throttle position switch, built into the throttle position sensor unit, consists of a closed throttle position switch and wide open throttle position switch. The closed throttle position switch detects the throttle valve position, i.e. whether it is in the idle position or not. The detected position will then be sent to the ECM as a voltage signal. The ECM uses this signal to open or close the EVAP canister purge control valve when the throttle position sensor is malfunctioning.




DIAGNOSTIC CHART




OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the closed throttle position switch circuit. During this check, a DTC might not be confirmed.




NO TOOLS
1) Start engine and warm it up sufficiently.
2) Check the voltage between ECM terminal (31) and ground under the following conditions.

At idle: Battery voltage
At 2,000 rpm: Approximately 0V







COMPONENT INSPECTION
Closed throttle position switch
1. Start engine and warm it up sufficiently.
2. Turn ignition switch "OFF".
3. Disconnect throttle position switch harness connector.
4. Check continuity between terminals (5) and (6).
If NG, replace throttle position switch.




WIRING DIAGRAM