Diagnostic Aids
- An IAT sensor that is skewed lower at various ambient temperatures, due to more resistance than is normal, can widen the spread between the 2 sensors and cause this DTC to set. Measure and record the resistance of the IAT sensor and IAT sensor 2 at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to Temperature Versus Resistance .
- Inspect both IAT sensors terminals, for corrosion or a poor connection.