DTC 0203 Closed Throttle Position Switch

DESCRIPTION
A closed throttle position switch and wide open throttle position switch are built into the throttle position sensor unit. The wide open throttle position switch is used only for A/T control.
When the throttle valve is in the closed position, the closed throttle position switch sends a voltage signal to the ECM. The ECM only uses this signal to open or close the EVAP canister purge control valve when the throttle position sensor is malfunctioning.




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the closed throttle position switch circuit. During this check, a DTC might not be confirmed.

Without Scan 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




WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

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) while opening throttle valve manually.




If NG, replace throttle position switch.