Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The system voltage is 9-18 volts.
The MIL lamp must be commanded ON for short to battery voltage.
The MIL lamp must be commanded OFF for an open or short to ground.
DTC P0650 runs continuously when the ignition is ON.