ENGINE   113.986 ENGINE   113.987 ENGINE   113.988 ENGINE   113.989

T1/1 Cylinder 1 ignition coil T1/2 Ignition coil cylinder 2 T1/3 Ignition coil cylinder 3 T1/4 Ignition coil cylinder 4 T1/5 Ignition coil cylinder 5 T1/6 Ignition coil cylinder 6 T1/7 Ignition coil cylinder 7 T1/8 Ignition coil cylinder 8 For each cylinder, a double ignition coil is fitted to the cylinder head cover.
		P15.10-2151-11

T1/1- T1/8 Cylinder 1 to 8 ignition coils Task The ignition coils provide sufficient ignition power under all operating conditions for the respective ignition circuit (cylinder). Design The engine has two sparkplugs (R4) per cylinder, which are actuated via a double ignition coil. The double ignition coils have two separate ignition circuits, two sets of ignition wiring and a 3-pole plug connection.
		P15.10-2095-02

Function 1 Connection pin 1 1a Circuit 1a 1b Circuit 1b 2 Connection pin 2 3 Connection pin 3 4a Circuit 4a (high-voltage connection) 4b Circuit 4b (high-voltage connection) 15 Terminal 15 fused (voltage supply) L1 Primary winding L2 Secondary winding N3/10 ME-SFI [ME] control unit R4 Spark plug
		P15.10-2128-03

The ME control unit simultaneously actuates both primary windings of the double ignition coils at circuits 1a and 1b with 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 ignition voltages reach the spark plugs via the high-voltage connections "circuit 4a" and "circuit 4b".

Voltage is supplied to the double spark plugs via "circuit 15 fused". Diodes are built-in to the secondary ignition 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.