Safety precautions when working with the ignition system (Audi 100 C4)

In the engine compartment of the Audi-100, a special sign warns of high voltage in the ignition system, and this is not without reason: even in the thin wire of the control circuit, voltages of up to 100 volts with a high current can occur, not to mention the dangerous high-voltage ignition voltage of over 30,000 V (but with a small current). Although, fortunately, there are no known cases of car owners being killed by the ignition system, touching uninsulated wires in adverse conditions can still be very dangerous, especially for people with heart disease. Therefore:

All electrical cables and instrument connections must be touched, disconnected or connected only when the ignition is switched off.



The battery should only be disconnected when the ignition is off.



If you just need to turn the engine over with the starter without starting it, then you should turn off the ignition system (see next section).

Before washing the engine, the ignition system should be turned off.

To start the engine with a discharged battery using a fast charger, it can be connected for no longer than one minute, and the voltage should not exceed 16.5 V.

If there is an obvious or suspected defect in the ignition system, it is necessary to turn off the ignition system when towing the vehicle (see next section).

A capacitor must not be connected to terminal 1/- of the ignition coil.

The distributor rotor cannot be replaced with the first one you come across, its resistance is 1 kOhm and the designation is "R1" (models with 4- and 5-cylinder engines).

Use only 1 kOhm resistance with thick high-voltage ignition system wires (models with 4- and 5-cylinder engines).

Use only spark plug contacts with a resistance of 5 kOhm.

When carrying out electric welding work in a vehicle, the battery cables must be disconnected.