Ok If you have an OHMS meter you could check the IAT sensor is working correctly ..
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).
Idle Speed Control System
Engine Control Module (ECM) is programmed with engine idle speed values. Idle air control system provides a stable idle speed when engine is cold and idle speed decreases due to electrical load. The Engine Control Module (ECM) uses various input signals to maintain proper idle speed by controlling Idle Air Control (IAC) valve located on air intake system.
INTAKE AIR TEMPERATURE (IAT) SENSOR
Ensure ignition is off. Disconnect electrical connector from intake air temperature sensor. Intake air temperature sensor is located in air intake, near air filter.
NOTE:Intake air temperature sensor may be also identified using appropriate illustration in the THEORY/OPERATION - 2.2L article.
Remove intake air temperature sensor. Place threaded end of intake air temperature sensor and thermometer in container of water. Attach ohmmeter between intake air temperature sensor electrical terminals.
Heat water and note that resistance is within specification in relation to temperature. See Fig. 3. Replace intake air temperature sensor if defective.
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Wednesday, March 18th, 2009 AT 11:28 AM