Idle Speed Step Motor - Chery automobile Service Manual

To avoid the mixture condensing and freezing in certain condition, throttle valve adjuster is
supported by anti-deadlock screw to prevent it from completely closing, and heated by
circulating coolant. Idling speed step motor (4) and throttle position sensor (5) are installed
on throttle body.
1.Throttle Cable Supporter 2.Anti-deadlock Screw
3.Throttle Valve Opening Angle Control 4.Idling Speed Step Motor
5.Throttle Position Sensor
Remark: Do not loosen the screw because the anti-deadlock screw is locked by
manufacturer during calibration of throttle valve.

IDLE SPEED STEP MOTOR

This kind of idling speed step motor (±25r/m) with high accuracy and good locating ability is
used to control idle speed. Directly fixed on throttle body and composed of a step motor and a
screw/worm retarder, it enables the lock pin (3) to convert the rotation motion into linear
motion. When receiving control instruction from ECU, the step motor drive valve core
moving (about 0.04mm/step) on axis direction through screw/worm device to change the
bypass air intake volume of engine at idle, therefore the idle speed can be insured steady. The
change is regulated based on the engine coolant temperature.
Air intake efficiency of the engine at idle speed is demarcated based on opening of the
throttle valve when by-pass air intake is closed through adjusting in manufacturing.
Step motor is connected directly on throttle body by a fast clamp without fixing screw.
F-3