Diagnostic Aids

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

When the vehicle is at ambient temperature the IAT sensor and the ECT sensor should be relatively close to each other. Refer to Temperature vs Resistance .
If a short to a separate 5-volt source occurs this DTC may set. If this condition exists, a continuity test to all other PCM 5-volt reference circuits will be necessary.
If an intermittent condition is suspected, refer to Intermittent Conditions .