General information
The idle speed control servo is an electric motor with two windings, which are switched on by separate control circuits of the electronic engine control unit. Depending on the fill factor of the pulse period, the difference in the magnetic forces of the two windings will rotate the motor shaft by a certain angle, thus changing the flow area of the bypass channel. The bypass port is located in the throttle body parallel to the throttle port at the location where the idle speed control servo is installed.
- Control box control signal frequency: 90-110Hz
Engines 2.0 l / 2.4 l. | Engine 2.7 l. |
Troubleshooting Guide
Under the following conditions, the Engine Malfunction Indicator Lamp (MIL) will illuminate and the appropriate DTC will be displayed on the tester.
1. If there is an open or short circuit in the primary voltage circuit on the side of the electronic engine control unit.
2. If the ignition timing control on the part of the electronic engine control unit is broken.
3. If an open or short circuit is detected in the idle speed control servo circuit after the ignition is turned on.
Checking the resistance of the servo windings
1. Disconnect the idle speed control servo connector.
2. Measure the resistance between the connector pins.
Rated value (at 20°C):
- conclusions "3" And "2": 10.5-14.0 ohm
- conclusions "1" And "2": 10.0-12.5 ohm
3. Connect the idle speed control servo connector securely.
- Idle speed servo mounting torque: 6-8 Nm
Testing with a tester
Start the engine and check that the idle speed control servo is activated (Idle speed control servo operates, engine speed increases or decreases).