Glow Plug System Operation
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2005 Ford RV Cutaway, 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
- Glow Plug Control Module (GPCM) Operation
- Glow plug on time is dependent on oil temperature and altitude. The GPCM will command the glow plugs on for 1 to 120 seconds. The GPCM does not operate if the oil temperature is above 55°C (131 °F).
- Connect the diagnostic tool. Access and retrieve the KOEO and continuous DTCs. If GPCM DTCs are present, GO to Pinpoint Test AF .
- Verify B+ voltage is supplied to the GPCM.
- Access and monitor the GPCTM and EOT PIDS to verify sufficient glow plug ON time.
- Turn the key to the ON position and measure the glow plug voltage (ON time).
NOTE:
The wait to start indicator ON time (1-10 seconds) is independent from glow plug ON time.
| On Time | Specification | Measurement |
|---|---|---|
| 1 to 120 seconds | B+ |
- Glow Plug Resistance
- Disconnect the glow plug bus bar connector.
- Measure the resistance between the glow plug bus bar connector, component side and battery ground.
- Disconnect the GPCM.
- Measure the resistance between the GPCM connector, harness side and the glow plug bus bar connector, harness side.
| Glow Plug Number | Glow Plug to Ground (0.1 to 2 ohms) | Glow Plug Connector to GPCM Connector (less than 5 ohms) |
|---|---|---|
| 1 | ||
| 3 | ||
| 5 | ||
| 7 | ||
| 2 | ||
| 4 | ||
| 6 | ||
| 8 |