DTC 0203

COMPONENT DESCRIPTION
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.






CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.






ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (25) (ECCS ground).






ON BOARD DIAGNOSIS LOGIC

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.






OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the closed throttle position switch circuit. During this check, a 1st trip DTC might not be confirmed.

Without TOOLS
(1) Start engine and warm it up to normal operating temperature.
(2) Check the voltage between ECM terminal (31) and ground under the following conditions.

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






Electrical Diagrams






Circuit Connectors






DIAGNOSTIC PROCEDURE


COMPONENT INSPECTION
Closed throttle position switch









1. Start engine and warm it up to normal operating temperature.
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.