Taurus V6-182 3.0L VIN 1 FI Flex Fuel (1997)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Typical Idle Air Control (IAC) Valve
PURPOSE
The Idle Air Control (IAC) valve is used to control engine idle speed provides a dashpot function.
OPERATION
The IAC valve assembly meters inlet air around the throttle plates through a bypass within the IAC valve assembly and throttle body. The desired idle
speed or air bypass is determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal.
The IAC solenoid (part of the throttle body assembly) has an internal diode on some applications. If this diode is measured in crossed terminal
position with a DVOM, there will be an incorrect or negative reading. It is important that the mating component and harness connectors be in the
proper orientation.
The IAC controls:
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Cold engine fast idle
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No touch start
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Dashpot
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Over temperature idle boost
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Engine idle load correction