Specifications
| Description | Nm |
|---|---|
| Glow plug | 10 |
Scheme 13
| Item Number | Description |
|---|---|
| 1 | Glow plug module |
| 2 | Pre heat warning light |
| 3 | Glow plug |
| 4 | Glow plug wire |
| 5 | Glow plug fuse |
| 6 | Glow plug relay |
The fundamental purpose of the glow plugs is to improve the cold start capability, cold start emissions and customer perception of the vehicle, such as short glow plug times and minimum cranking times, as well as low combustion noise at low ambient temperatures.
The maximum current when switched on will be approximately 18 Amps per plug at 40° C (104° F) with a 12 Volt supply.
The Glow Plug Control Module (GPCM) is located in the engine bay on the right hand side. It acts as a switch for the current to the glow plugs and is controlled via the engine control module (ECM). Above a given coolant temperature, glow plugs will not be switched on before, during or after starting. Within a certain coolant temperature range, the glow plugs will be active before cranking to increase combustion chamber temperature, during cranking to assist engine starting, and after the engine has started in order to reduce the emissions of white and possibility black smoke from the tail pipe immediately following a cold start.
The ECM is connected to the GPCM via a reference control line and a diagnostic line. The former will be pulled down by the ECM causing the GPCM to switch on and to remain switched on while the reference voltage is low. The ECM will store the error information generated by the GPCM in the case of glow plug failure.