Contents: Component arrangement ⇩ General Provisions ⇩ System operation ⇩ Glow Plug Control Circuit ⇩
Component arrangement
| Item name | Spare part catalog number | Description |
| 1 | - | Glow plug relay row B (left) |
| 2 | - | Glow plug relay for row A (right) |
| 3 | - | Glow plug indicator |
| 4 | - | Glow Plugs (x 6) |
| 5 | - | Glow Plug Harness (x 2) |
General Provisions
Glow plugs are installed in each cylinder on the intake side. The purpose of the glow plugs is to heat the combustion chambers before and during cranking to facilitate cold engine starting and after the engine has started to reduce hydrocarbon emissions and cold engine idling noise.
The glow plug harness for each bank of cylinders is connected to its own relay and its own fuse in the battery junction box (BJB). Ground for each glow plug is provided through its threaded socket in the cylinder head. The glow plug relay is controlled by the ECM, which also controls the glow plug indicator in the instrument cluster.
The article is based on information from the website: www.LRman.ru
Each glow plug is a tubular heating element with a spiral filament that is encased in powdered magnesium oxide. At the very tip of the tubular heating element is a heating coil. Behind this coil, in series with it, is a ballast coil. The ballast coil limits the current through the heating coil, preventing it from overheating.
System operation
Glow plug heating is divided into three phases: preheating, start-up heating, and post-heating. The ECM determines the heating duration based on the engine coolant temperature (ECT). The lower the temperature, the longer the heating.
When the ignition key is turned to position II, the ECM calculates the required preheat duration and, if preheating is required, turns on the glow plug relay in the BJB. When the preheating requirement exists, the ECM sends a request via the high-speed CAN bus to turn on the glow plug indicator. The glow plug indicator remains on until the end of the first phase or until the key is turned to start, whichever occurs first. If necessary, the ECM leaves the glow plug relay on both during cranking and after the engine has started.
The ECM monitors the glow plug power and control circuit to determine if the glow plug is operating properly, if it is not on, if it is shorted, or if it is open. If a malfunction is detected, the ECM stores a corresponding DTC and keeps the glow plug indicator illuminated continuously when the ignition switch is in position II.
Glow Plug Control Circuit
NOTE: A = Normal Wiring
| Item name | Spare part catalog number | Description |
| 1 | - | Battery |
| 2 | - | Fuse link 11E in BJB block |
| 3 | - | Ignition switch |
| 4 | - | 25P fuse in Central Junction Box (CJB) (ignition) |
| 5 | - | 60P fuse in CJB (start) |
| 6 | - | ECM |
| 7 | - | Glow plug 6 |
| 8 | - | Glow plug 5 |
| 9 | - | Glow plug 4 |
| 10 | - | Glow plug 1 |
| 11 | - | Glow plug 2 |
| 12 | - | Glow plug 3 |
| 13 | - | 4E fuse link in BJB block |
| 14 | - | Fuse link 1E in BJB |
| 15 | - | Glow plug relay for row A (right) |
| 16 | - | Glow plug relay row B (left) |
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