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944 S/944 S2 Fuel System - Electronic Control
24/28
Important Vehicle Information
Always turn off the ignition or disconnect the battery for resistance tests (if not, the tester
could be destroyed).
Always disconnect the speed sender plug for compression tests (if not, there could be
dangerous high tension and damaged insulation on the ignition coil, high tension distributor
and ignition leads).
Never replace a specified ignition coil (see order number) with a different ignition coil.
Never connect a suppression capacitor on ignition coil terminals 1 and 15.
Never connect ignition coil terminal 1 on ground for the burglar alarm (ignition coil and
control unit could be destroyed).
Never connect battery + or a test lamp on ignition coil terminal 1 (control unit could be
destroyed).
Never disconnect the ignition lead between ignition coil terminal 4 and high tension
distributor terminal 4 during operation.
Avoid voltage flashover from ignition coil terminal 4 to ignition coil terminals 1 and 15
(control unit could be destroyed).
To avoid destruction of the control unit, the secondary circuit of the ignition system must be
suppressed with at least 4 k-ohms, whereby the original distributor rotor with 1 k-ohm
suppression resistance must be installed.
Disconnect DME control unit and ignition final stage plugs only atter turning off the ignition.
Flashover or disruptive discharge in the area of the high tension distributor cap (poor
insulation) could destroy the control unit.
Never disconnect the battery while the engine is running.
Mixing up battery pole connections could lead to destruction of the ignition final stage,
ignition coil and DME control unit.
Outside starting of the engine with more than 16 volts or a boost battery charger is
forbidden.
Always conform with accident prevention regulations when working on fuel systems.
DME - Diagnosing/Troubleshooting
Printed In Germany - XXI, 1989
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