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.

If a short to a separate 5-volt source occurs, this DTC may set. If this is the condition, a continuity test to all other ECM circuits will be necessary in order to diagnose the specific circuit.
After starting a cold engine, the fuel temperature sensor should be within a few degrees of the intake air temperature (IAT) reading.
Use the Temperature vs. Resistance table to test the fuel temperature sensor at various temperature levels and to evaluate the possibility of a skewed sensor.
If the condition is suspected of being intermittent, refer to Intermittent Conditions .