Circuit Description

Idle speed is controlled by Electronic Throttle Control System (ETCS). Description of ETCS components are as follows:

• Throttle motor is used to operate throttle valve.
• Magnetic clutch is used to connect throttle motor with throttle valve.
• Throttle position sensor is used to detect opening angle of throttle valve.
• Accelerator pedal position sensor is used to detect accelerator pedal position.
• Engine Control Module (ECM) controls ETCS.

DTC is set when idle speed continues to vary greatly from target speed. Possible causes are:

• Defective ETCS.
• Air induction system malfunction.