Catalytic Converter Protection Function (Ign. Cir. Monitoring)

OPERATION
In the Digital Motor Electronic (DME) M 1.7 system, the cylinder reference point sensor is used for ignition circuit monitoring. If the cylinder reference point sensor detects no ignition signal on the ignition lead 6 (or 12), the supply of fuel is cut by shortening the injection signal. However, the signal is not cut completely to ensure that the Electronic Throttle Control (EML) system does not revert to the emergency pm - gram. The vehicle can still be driven with the remaining row of cylinders.

The cylinder reference point sensor therefore monitors the entire primary side and the cylinder 6 or 12 on the secondary side.