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
Remarks: Specification data are reference values.




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




ON BOARD DIAGNOSIS LOGIC

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.

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

EC-TP/SW-01 Closed Throttle Position Switch (DTC: P0510):

WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
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).

Accelerator petal conditions / Continuity
Completely released / Yes
Partially released or completely depressed / No

If NG, replace throttle position switch.