Diagnostic Aids
WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
In order to determine whether an improper voltage level exists on the output circuit, the PCM compares the voltage level to the commanded state. Fort example, a failure condition exists if the PCM Detects a low voltage level when the devices is commanded OFF, or a high voltage level when the device is commanded ON.
If the condition is intermittent, refer to INTERMITTENT OR POOR CONNECTIONS in Wiring Systems.