Navigator 4WD V8-5.4L DOHC VIN A (2000)
increase in fuel atomization at low speed and light load conditions.
NOTE: The IAC Valve Assembly is NOT ADJUSTABLE and CANNOT BE CLEANED.
The IAC valve (part of throttle body assembly) has an internal diode on some applications. If the internal diode is measured in crossed terminal position
with a digital multimeter, there will be an incorrect or negative reading. It is important that the mating component and harness connectors are correctly
oriented. Diagnostic procedures emphasize this importance.
The PCM uses the IAC valve assembly to control:
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No touch start
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Cold engine fast idle for rapid warm-up
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Idle (corrects for engine load)
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Stumble or stalling on deceleration (provides a dashpot function)
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Over-temperature idle boost.
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Air Assist to Injectors.
