Conditions For Setting DTC
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Microprocessor runs program to detect internal faults in SDM. Voltage and ground are only requirements for running program. Program will run even if voltage is out of valid operating range.