Component description of ignition coil (Engine 113) - GF15.10-P-2100BK

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ENGINE 113.967 in MODEL 219

ENGINE 113.964 in MODEL 164.1

ENGINE 113.971 in MODEL 251

Location

For each cylinder, a double ignition coil is located at the cylinder head cover.

Fig 1: Identifying Ignition Coil

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

The ignition coils provide sufficient ignition energy under all operating conditions for the respective ignition circuit.

Design

Two spark plugs per cylinder, controlled by a double ignition coil.

The double ignition coils have two separate ignition circuits, two ignition cable connections and a 3-pole plug connection.

Fig 2: Identifying Ignition Coils Cylinders

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

Fig 3: Ignition Coils Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The ME control unit simultaneously actuates both primary windings of the double ignition coils at circuits 1a and 1b to ground.

The primary current flow is interrupted at the moment of ignition timing point. As a result of the sudden collapse of the magnetic field the ignition voltage is generated in the secondary windings.

The respective ignition voltage is sent via high-voltage terminals 4a and 4b via short ignition lines and spark plug connectors to the spark plugs.

The voltage supply for the double ignition coils is provided via "circuit 15".

Diodes are built-in to the secondary ignition circuit to suppress additional ignition sparks when the primary current is switched on.

Because of the diodes, it is not possible to measure the resistance in the secondary windings.