Idle Speed Control: Notes
NOTE:
For other input components in idle speed circuit, see INPUT DEVICES under COMPUTERIZED ENGINE CONTROLS.
Idle speed is controlled by Idle Air Control (IAC) valve and fast idle thermovalve. IAC valve controls amount of air into the intake manifold according to input signals received from the PCM. The following PCM inputs have influence on IAC valve operation and idle speed:
- A/C Clutch Signal
- Generator FR Signal
- A/T Gear Position
- Brake Switch
- Engine Coolant Temperature Sensor
- Power Steering Pressure Switch
- Starter Switch Signal.