copyed from technical


Engine RPM and tdc Sensor

This sensor is bolted to the engine front end. The crankshaft pulley has 4 identical teeth spaced at precisely 90°. The sensor sends a signal to the module whenever a tooth passes the sensor. From this signal the module determines engine speed (RPM) and the TDC*position of each piston (crankshaft position) .
The gap between the sensor and the teeth on the crankshaft pulley is 0.4 to 1.0 mm and is factory set (see service adjustments).

The Phase Sensor-Distributor

This sensor is located inside the distributor. It's signals (and the signals from the RPM/TDC sensor) enable the ECU to identify the phase of each cylinder following the firing order.
The gap between the sensor and the teeth of the distributor cam is 0.2 to 0.3 mm and is factory set (see service adjustments).

RPM/TDC-Sensor
1 = Tooth on crankshaft pulley
2 = Sensor
A = 0 to 1.0mm

Phase Sensor-Distributor
1 = Sensor
2 = Tooth
A = 0.2 to 0.3 mm