Circuit Description

The IAT sensor is a thermistor mounted in the air cleaner housing to monitor air temperature flowing to intake manifold. Code is set when ECM detects a open or short circuit. ECM will operate in fail-safe mode if Code 24 is set. Possible causes are:

IAT sensor open or short circuit.
IAT sensor malfunction.
ECM malfunction.

NOTE: If Codes 22, 24, 31 and 41 are output together, inspect ECM terminal E2 (ground) circuit. Repair as needed. See wiring diagram in the WIRING DIAGRAMS article.