P0505

WIRING DIAGRAM

CIRCUIT DESCRIPTION
The ISC actuator installed to the throttle body consists of DC motor, gears, plunger, closed throttle position (CTP, idle) switch, etc. According to the signal from ECM, how much the plunger projects varies. (The ISO actuator controls the minimum throttle valve opening according to signals from ECM.) The closed throttle position (idle) switch consisting of hall integrated circuit, magnet and spring detects whether the plunger of the ISO actuator contacts the throttle lever screw or not and transmits it as ON/ OFF signal to ECM.
- CTP (Idle) switch ON: when plunger of ISC actuator is in contact with throttle lever screw
- CTP (Idle) switch OFF: when plunger is apart from throttle lever screw.





DETECTING CONDITION AND POSSIBLE CAUSE

DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF.
2. Clear DTC with ignition switch ON.
3. Start cold engine.
4. Run it idle for 5min.
5. Select "DTC" mode on scan tool and check DTC.
NOTE: If engine speed changes up and down when engine speed is increased by opening throttle valve more than half but not changing its opening, it is possible that closed throttle position switch is malfunctioning.

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INSPECTION