Prowler V6-3.5L VIN G (1999)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
1999 IDLE AIR CONTROL MOTOR-PCM OUTPUT
Idle Air Control Motor
The idle air control motor attaches to the throttle body. The PCM operates the idle air control motor. The PCM adjusts engine idle speed through
the idle air control motor to compensate for engine load or ambient conditions.
The throttle body has an air bypass passage that provides air for the engine at idle (the throttle blade is closed). The idle air control motor pintle
protrudes into the air bypass passage and regulates air flow through it.
The PCM adjusts engine idle speed by moving the idle air control motor pintle in and out of the bypass passage. The adjustments are based on
inputs the PCM receives. The inputs effecting idle speed include the throttle position sensor, road speed (from Transmission Control Module),
coolant temperature sensor, battery voltage and battery temperature. Also vanous switch operations (brake, park/neutral, air conditioning) effect
idle speed. The PCM prevents deceleration die out by increasing air flow when the throttle closes quickly.
