Diagnostic Aids

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

When the engine is at ambient temperature the IAT sensor and ECT sensor temperatures 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 ECM 5-volt reference circuits will be necessary.
If an intermittent condition is suspected, refer to Intermittent Conditions .