Mercedes-Benz ML320. Manual — part 383

Fig. 6: Identifying Cylinder 1 To 8 Ignition Coil - Location Engine 113

IGNITION COILS, FUNCTION - GF15.10-P-3102-02A

Each spark plug is actuated separately via its own ignition coil by the ME control unit. Both ignition coils of a
cylinder are combined to form a dual ignition coil.

The ME control unit actuates the primary wirings (L1) of the double ignition coils at circuits 1 a or 1 b 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 (L2). The ignition
voltage flows through the high voltage connection (4a and 4b) and through the spark plug connector to the
respective spark plug (R4).

The voltage supply of the double ignition coils is protected at circuit 15 (a).

Diodes are built-in 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.

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 7: Identifying Ignition Coils, Function

IGNITION COILS, LOCATION/TASK/DESIGN/FUNCTION - GF15.10-P-3102A

ENGINE
112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /95

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969

Fig. 8: Identifying Ignition Coil Components - Shown On Engine 112

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

ME-SFI IGNITION SYSTEM FUNCTION DIAGRAM - GF15.12-P-0001-01A

Fig. 9: Identifying ME-SFI Ignition System Components - Engine 112

ME-SFI IGNITION SYSTEM FUNCTION DIAGRAM - GF15.12-P-0001-01B

Ignition coils, location

GF15.10-P-3102-01A

Ignition coils, task

Supplying adequate
ignition energy in all
operating conditions for
the particular ignition
circuit.

Ignition coils, design

One double ignition coil
for each cylinder. Attached
to cylinder head cover.

Ignition coils, function

GF15.10-P-3102-02A

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 10: Identifying ME-SFI Ignition System Components - Engine 113

ME-SFI IGNITION SYSTEM SIGNAL ASSIGNMENT - GF15.12-P-0001-02A

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me