Conditions for Setting the DTC

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

During the key ON test, the ECM/PCM detects high voltage on the generator turn ON signal circuit for at least 5 seconds.
OR
During the RUN test the ECM/PCM detects low voltage on the generator turn ON signal circuit for at least 15 seconds.