How to disconnect IAC valve from check engine light?
1 With the IAC valve connected, ground the diagnostic (ALDL) terminal (same as you would do to flash trouble codes thru the check engine light). 2 Turn ON the ignition, but do NOT start the engine. Wait at least 30 seconds. 3 With the ignition still on, disconnect the IAC electrical connector.
Where is the Idle Air Control ( IAC ) valve?
Ensure your ignition if OFF. Remove the connector to the IAC valve, located right below the Throttle Position Sensor (TPS) on the left side of the throttle body as you are looking at it from the front of the car.
How to test the coil driver circuits in the IAC valve?
How To test the coil driver circuits in the (IAC) valve: Using an ohmmeter, measure the resistance between pins 3 and 2 on the (IAC) valve. Resistance should be 10-14 ohms. If resistance is ok, proceed to the next step.
What should I measure before reinstalling my IAC valve?
Before reinstalling the IAC valve, measure the distance that the valve is extended, from the motor housing to the end of the cone. It should not exceed 1-1/8″ (28.6mm), or damage to the valve may occur when reinstalled. You should use a new gasket when possible.
What should the IAC reading be on a car?
The purple vertical line shows the current coolant temperature reading. In our example, above, the coolant temperature sensor finds the engine at 88 degrees. The IAC parked position at 88 degrees is approximately 80% (plunger is pulled 80% of the way out of the IAC passage.)
What are the symptoms of an idle air control valve ( IAC )?
Another symptom of a potential issue with the idle air control valve (IAC) is; an illuminated Check Engine Light. If the engine control module detects an issue with the idle air control valve circuit or signal; it will set off the Check Engine Light to notify the driver that there’s an issue.
What’s the best way to test an IAC valve?
Without a doubt, using an OEM-level scan tool is the easiest way to test an IAC valve. OEM-level means the scanner has most of the same functions as the dealer’s factory tool. Code readers and OBD-II scan tools don’t have the necessary bi-directional controls to test an IAC.