Tightening torque specifications
| Description | Нм | pound-foot |
| Glow plugs | 10 | 7 |
Description and principle of operation
| Pos. | Spare part number | Name |
| 1 | - | Glow plugs |
| 2 | - | Glow Plug Indicator Light |
| 3 | - | BJB |
Glow plugs are installed on the intake side of each cylinder; they serve to warm up the combustion chambers before and during cranking. This facilitates cold starting, reduces the level of exhaust toxicity and engine noise when the cold engine is idling.
The wiring harness on each row of glow plugs is connected to a separate relay and fuse link in the BJB (battery junction box). Each glow plug is grounded through a mounting on the cylinder head. The glow plug relay is controlled by the ECM, which also controls the glow plug indicator light in the instrument cluster.
Each glow plug is a tubular heating element with a spiral filament that is encased in powdered magnesium oxide. The tip of the tubular heating element contains a heating coil. Behind the heating coil is a control coil connected in series. The control coil regulates the current supplied to the heating coil, providing protection against overheating.
Job
There are three phases of glow plug operation: Pre-glow, Cranking Glow, and Post-glow. The ECM determines the glow time based on the ECT (Engine Coolant Temperature) signal. The lower the engine coolant temperature, the longer the glow time.
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When the ignition switch is turned to position II, the ECM calculates any required preheat time and, if preheat is required, energizes the glow plug relay in the BJB. When a preheating requirement exists, the ECM sends a message over the high speed CAN bus to the instrument cluster to request that the glow plug indicator lamp be illuminated. The glow plug indicator lamp remains illuminated until the end of phase one or until the key is turned to the crank position, whichever comes first. If required, the ECM leaves the glow plug relay on during cranking and for a specified time after the engine has started.
The ECM monitors the glow plug relay power and control circuit for proper operation, continuity, short circuit, and open circuit. If a malfunction is detected, the ECM stores a corresponding DTC and keeps the glow plug indicator lamp on continuously when the ignition switch is in position II.
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