Idle Air Control (IAC) Valve On-Vehicle Inspection
1) Connect each connector to IAC valve (1), TP sensor and IAT sensor.
2) Check that rotary valve (2) of IAC valve opens and closes once and then stops in about 60 ms as soon as ignition switch is turned ON.
This check should be performed by two people, one person turns on ignition switch while the other checks valve operation.
As valve operation is momentary, it may be overlooked. To prevent this, perform this operation check 3 times or more continuously.
If rotary valve of IAC valve does not operate at all, check wire harness for open and short. If wire harness is in good condition, replace IAC valve and recheck.