Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

With the ignition ON, the engine OFF and the engine is cold, a properly functioning IAT Sensor 2 will gradually increase the scan tool IAT Sensor 2 parameter. This is due to the heat that is generated by the MAF sensor heating elements.
The humidity sensor and the IAT Sensor 2 signals are sent to the ECM on the same circuit. If the IAT Sensor 2 parameter displays the values: 10Hz; -40°C (-40°F), and there are also Humidity Sensor DTCs, check for a circuit problem.