Ignition Coils, Basic Function - GF15.10-P-2002A
Eninge 139, 176, 177, 254, 256, 260, 264, 274, 279, 282
Engine 177, 256
Sample illustration of ignition coils
Sample illustration of ignition coil
Overview
This document contains information on:
- General
- Function
- Spark plugs
General
The ignition coils (1.1 to 1.4, 2) provide sufficient ignition energy to the respective spark plugs under all operating conditions.
Function
The combustion engine control unit actuates the primary coil. The primary circuit is interrupted at the moment of ignition timing point. Due to the sudden collapse of the magnetic field in the primary coil, the ignition voltage is generated in the secondary coil.
The ignition voltage reaches the spark plug via a diode, a resistor, and the high-voltage terminal (3). The diode is fitted to suppress an additional ignition spark when the primary current is switched on.
The ignition coils (1.1 to 1.4, 2) are supplied with power via terminal 87M.
Because of the diode it is not possible to measure the resistance of the secondary coil. The output stages for actuating the ignition coils (1.1 to 1.4, 2) are integrated in the combustion engine control unit.
Spark plugs
For each cylinder, one spark plug is screwed centrally into the cylinder head from above. The spark plugs ignite the suctioned and compressed fuel/air mixture due to arcing between the electrodes.
The ignition voltage flows from the directly plugged in ignition coils (1.1 to 1.4, 2) to the spark plugs and causes arcing in the air gap between the central electrode and the ground electrode.
All spark plug characteristics are defined by type symbols provided by the manufacturer, e.g. heat rating, seat shape, thread, size, electrode material, spark position.
| Ignition coils, detailed information | Engine 254, 256, 260, 264, 282 | GF15.10-P-2501A | |
| Engine 139 in model 118 up to model year 2023 Engine 139 in model 177, 247 up to model year 2022 |
GF15.10-P-2501B | ||
| Component description for ignition coils | Engine 176, 177, 256, 279 in model 223 | GF15.10-P-2100A | |
| Engine 139, 254 in model 206 | GF15.10-P-2100C | ||
| Engine 139, 177 in model 232 | GF15.10-P-2100F | ||
| Engine 139, 254 in model 254 | GF15.10-P-2100H | ||
| Engine 254, 256 in model 214 | GF15.10-P-2100K | ||
| Engine 139, 260, 282 in model 118 as of model year 2023 Engine 139, 260, 282 in model 177, 247 as of model year 2022 |
GF15.10-P-2100L | ||
| Engine 176, 177, 254, 256, 264, 274 in model 167 as of model year 2023 | GF15.10-P-2100M | ||
| Engine 139, 177 in model 192 | GF15.10-P-2100R | ||
| Engine 177, 254, 256 in model 236 | GF15.10-P-2100S | ||
| Engine 177.8 in model 465.2 Engine 256.8 in model 465.2 |
GF15.10-P-2100T |