![]() The denser the air, the more fuel the PCM has to inject into the engine. The main reason why the PCM needs to know the temperature of the incoming air, is that temperature has an effect on the density of the air the engine is breathing. In a nutshell, the intake air temperature (IAT) sensor helps the PCM ( Powertrain Control Module = Fuel Injection Computer) make a correct measurement of the air mass that enters the engine. If you need to see what this tool looks like, you can see it here: Wire Piercing Probe.This tool makes it super easy to test the voltages inside the wires.Don't have one? Check out my recommendation: Abe's Scan Tool Recommendation.Although you can check the IAT sensor without a scan tool, using a scan tool with Live Data capability is the fastest and easiest way to test the IAT sensor.If you need to upgrade or buy a multimeter, check out my recommendation: Buying A Digital Multimeter For Automotive Diagnostic Testing (found at: ).You'll need a multimeter to measure DC Voltage and Resistance (Ohms).Here's a basic list of tools you'll need: What Tools Do I Need To Test The IAT Sensor? Black smoke coming out of the tailpipe.This means that the IAT sensor is reporting a temperature of -38 ☏ (-39 ☌).P0113: Intake Air Temperature (IAT) Sensor Circuit High Voltage.This means that the IAT sensor is reporting a temperature of 300 ☏ (149 ☌).P0112: Intake Air Temperature (IAT) Sensor Circuit Low Voltage.Here are some of the specific symptoms you'll see/have: The second will be an IAT sensor malfunction diagnostic trouble code (DTC) stored in the PCM memory. The most obvious symptom will be the check engine light (CEL) lit nice and bright on your instrument cluster. Intake Air Temp (IAT) Temperature/Resistance Chart.TEST 7: IAT Sensor Resistance Test (P0113).TEST 6: IAT Sensor Resistance Test (P0112).TEST 5: Jumpering the IAT Sensor Circuits.TEST 3: IAT Sensor Circuit Low Voltage.TEST 2: IAT Sensor Circuit High Voltage.TEST 1: Checking The Intake Air Temperature Value.What Tools Do I Need To Test The IAT Sensor?.
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