Ignition coils
The ignition circuit of this coil ignition consists of:
- Ignition coil with primary and secondary coil
- Ignition output stage in the engine control unit
- Spark plugs, connected to the secondary winding
Each spark plug receives its high-tension voltage from its own ignition coil (pencil coil) and a separate individual ignition output stage within the engine control unit.
The ignition coils receive power from Terminal 30 from the ignition's load-shedding Terminal 15 relay.
| Index | Explanation |
|---|---|
| 1 | Ignition coil |
| 2 | 3-pin plug connection |
| 3 | Spark plug |
The Terminal 15 load-shedding relay is in the engine-compartment power distribution box.
| Index | Explanation |
|---|---|
| 1 | Wiper relay |
| 2 | Wiper relay, intermittent settings 1 and 2 |
| 3 | Relief relay, terminal 15 |
| 4 | Electric fan relays |
| 5 | Engine ventilation heating relay |
| 6 | DME main relay |
The spark plugs emit high-frequency interference pulses. A means is required to suppress them. The interference-suppression capacitor prevents interference from being propagated through the vehicle's electrical system. The interference-suppression capacitor is connected to earth in the load circuit. Always observe the diagnostic wiring diagrams when servicing this equipment.