Glow Plug System Operation
- 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 |
|
|