Diagnostic Aids
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. 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.
If the condition is intermittent, refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.