Glow Plugs - PCM-Controlled
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The glow plugs are located in the cylinder heads, under the glow plug wiring harness.
The glow plugs are self-regulating. If the engine oil temperature is above 55°C (131°F), the powertrain control module will bulb-check the WAIT-TO-START lamp but not energize the glow plug relay.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, EOT and BARO.
The glow plug ON time is independent of the WAIT-TO-START lamp ON time.
The glow plug control monitor (GPCM) system is designed to find failed glow plugs or failed wiring in the glow plug system.