Town & Country V6-3.8L VIN L (2006)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
TPS/IAC 2.4L
TPS/IAC 3.3/3.8L
The idle air control motor is mounted on the throttle body. The PCM operates the idle air control valve.
The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure
changes.
The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the
air bypass passage.
The PCM controls engine idle speed by adjusting the position of the idle air control valve. The adjustments are based on inputs the PCM receives. The
inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch
operations (brake, park/neutral, air conditioning).
When engine rpm is above idle speed, the IAC is used for the following functions:
-
Off-idle dashpot
-
Deceleration air flow control