High beams issue!

Hey Mike.

What was the actual reading on the OHMS meter ??

let me know

Mike.

You should have a reading of 0.2 to 0.3 ohms @212 degrees .. if you have a reading of 19 @ 212 degrees .. the IAT is way off base or i'm reading your answer incorrectly ??

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I still think the IAT is faulty !! it should read between 0.2 and 0.3 @212 degrees ..yours is below 0.2 ? do you happen to remeber the OHMS and temperature when you first started the test ??...this signal controls air/fuel ratio on cold start up !!

Intake Air Temperature (IAT) Sensor
Intake air temperature sensor is mounted in either airflow meter or air filter housing. Intake air temperature sensor measures incoming intake air temperature and delivers an input signal to THA terminal of Engine Control Module (ECM) for controlling fuel injection system, fuel pressure control (if equipped) and heated oxygen sensor systems (if equipped).

There are no TSB's regarding the IAC valve .. but you can test it !!

To check IAC valve operation, remove IAC valve from throttle body. Connect battery voltage and ground to proper terminals and ensure valve opens and closes. See Fig. 23. Replace IAC valve if defective.

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Hey Mike.

How was the car when you started without IAT hooked up !! was it cold/warm and did it start/run OK ?

CODE 24 - INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT
CAUTION:If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction.

Circuit Description
The IAT sensor is a thermistor mounted in the air cleaner housing to monitor air temperature flowing to intake manifold. Code is set when ECM detects a open or short circuit. ECM will operate in fail-safe mode if Code 24 is set. Possible causes are:
IAT sensor open or short circuit.
IAT sensor malfunction.
ECM malfunction.
NOTE:If Codes 22, 24, 31 and 41 are output together, inspect ECM terminal E2 (ground) circuit. Repair as needed. See wiring diagram in the WIRING DIAGRAMS - 2.2L article.

Diagnosis & Repair
Access ECM. ECM is located behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector. Measure voltage between terminals THA and E2. See Fig. 5 (M/T Except Calif.) or Fig. 6 (A/T & M/T Calif.). Voltage should be 0.5-3.4 volts for cool intake air temperature and 0.2-1.0 volt for hot intake air temperature.
If voltages measured are within specification, inspect connections, problem may be intermittent. If voltages are NOT within specification, go to next step.
Inspect IAT. See the SYSTEM/COMPONENT TESTS - 2.2L article. Replace as needed. If IAT is okay, inspect circuits between IAT and ECM for opens or shorts. See appropriate wiring diagram in the WIRING DIAGRAMS - 2.2L article. Repair as needed. If circuits are okay, replace ECM and retest.

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Mike, the IAT wonlt keep the car from starting. If it's not functioning correctly, it will make it "difficult" to start and won't control the cold idle fuel mixture like it's supposed to. It will search for a correct idle speed but can't find one, so the engine dies. I highly you do, as Dave suggested, and CHANGE the IAC.

IAT, sorry, I lost my head for a minuete. Sometimes they'll set a code, sometimes they won't. It can depend on how far out of range they are.

Hey Mike.

I had to go out yesterday ..Big thanks to James for the assistance ...You should be able to get the IAT from most autoparts stores .. it does not need to be a dealer !!

start the car up this morning with the IAT unplugged ..and see how it runs .. it should run OK at it's default values ..and this may set a fault code !!

let me know

Hey Mike.

My manual is telling me you should be getting 3.4 volts MAXIMUM @ cool engine condition. Of course this all depends on outside ambient air temp and what reading the IAT sensor is sending to the PCM. Regarding ambient air temp !

Dave H