Mercedes Benz Workshop Service and Repair Manuals

Ignition Coil: Specifications

Voltages (ignition on, engine off)

coil terminal 15....................................................................................................................................................................................... battery voltage
(terminal 5, diagnostic socket)
between coil terminals 1 and 15.............................................................................................................................................................................0 vdc
(terminals 4 and 5 at the diagnostic socket)
between terminal 15 and 31 (4-pole round plug at control unit)..............................................................................................................battery voltage
between terminal 16 and 31 (4-pole round plug at control unit)..............................................................................................................battery voltage

Resistances (test figures for 0°C to 100°C)

Ignition coil primary (terminals 1 and 15)................................................................................................................................................0.2 - 0.4 Ohm
Ignition coil secondary (terminals 1 and 4)................................................................................................................................................7 - 13K Ohm
Position sensor......................................................................................................................................................................................680 - 1200 Ohm
Reference input resistor (EZL).........................................................................................................................................................................770 Ohm

Dwell

at cranking rpm...................................................................................................................................................................................1 - 40% or 1 - 18°
at 3200 rpm....................................................................................................................................................................................60 - 90% or 27 - 40°

Ignition timing

at cranking rpm.......................................................................................................................................................................................................3 - 7°
at idle (with vacuum)..........................................................................................................................................................................................10 - 14°
at idle (without vacuum).........................................................................................................................................................................................3 - 7°
at 3500 rpm (with vacuum)................................................................................................................................................................................41 - 45°
at 3500 rpm (without vacuum)...........................................................................................................................................................................28 - 32°

Spark plug gap..............................................................................................................................................................................................0.8 mm (0.032 in)