1. Locate the Intake Air Temperature sensor (IAT) located in the air cleaner outlet hose, just in front of the throttle body inlet, and inspect for loose or unplugged connector and repair as needed.
2. Backprobe the Grey wire and with Key On Engine Off (KOEO), and expect a voltage between 3.5 volts (50* air temp) and possibly as low as 1.0 volts (160* temp). If voltage reading is 4.6 volts or greater (-40* temp) and connections are good, replace the faulty sensor.
3. If no voltage present, unplug the sensor connector to test for an open circuit voltage of at least 4.6 volts. If still no voltage present, trace to locate and repair open in Grey wire from Intake Air Temperature sensor to pin 39 of Powertrain Control Module (PCM) connector.
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