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)................................................................................................................................................0.3 - 0.6 Ohm
Ignition coil secondary (terminals 1 and 4)................................................................................................................................................7 - 13K Ohm
Position sensor......................................................................................................................................................................................680 - 1200 Ohm
Reference input resistor (EZL).........................................................................................................................................................................750 Ohm

Dwell

at cranking rpm ................................................................................................................................................................................10 - 54% or 9 - 49°
at 3200 rpm....................................................................................................................................................................................30 - 60% or 27 - 54°

Ignition timing

at cranking rpm................................................................................................................................................................................................TDC ± 2°
at idle (with vacuum)............................................................................................................................................................................................8 - 12°
at 3200 rpm (without vacuum)...........................................................................................................................................................................25 - 29°
at 3200 rpm (with vacuum)................................................................................................................................................................................39 - 43°

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