Common Symptoms
- Check Engine Light illuminated
- Hard starting in cold weather
- Poor fuel economy
- Black smoke from exhaust
- Engine runs rough or hesitates on acceleration
- Engine may enter limp mode
Most Likely Root Causes
- Open circuit in IAT sensor wiring harness
- Failed intake air temperature sensor
- Corroded or damaged IAT sensor connector
- Shorted IAT sensor ground circuit
- PCM internal fault
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Component Location
The intake air temperature sensor is typically integrated into the mass airflow sensor housing or mounted in the intake air duct.
Manufacturer Notes
Some vehicles use a combined MAF/IAT sensor assembly where replacing the entire unit may be necessary rather than the IAT sensor alone.
Also diagnosing J1939 SPN/FMI codes?
Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
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