Plug, Glow: Operation
CAUTION:
The glow plugs operate on a 5-volt system. DO NOT test the glow plugs with a 12 V source as damage will occur to the glow plug(s).
The Powertrain Control Module (PCM) monitors various engine sensors. When the ignition key is turned to the ON position, the PCM sends a signal to the glow plug module (relay) to turn on, and cycle, the glow plugs for a pre-determined amount of time, plus illuminate the glow plug light in the instrument panel. Once activated, the element inside of the core of the glow plug begins to glow. If there is a fault with the glow plug system, the PCM will store a fault code.