Removing-refitting

The sensor is connected to the control unit by means of twisted cables covered by a shielded anti-interference sheath.

Pin 1 - Signal
Pin 2 - Earth
Pin 3 - Shielding

NOTE The numbers in boxes indicate the corresponding control unit pins.

Removing-refitting

Disconnect the wiring connector.

Undo the screw indicated and remove the sensor.

Checking the gap

Check the distance between the sensor and phonic wheel teeth (gap).

Gap: 0.5 - 1.5 mm

NOTE If work has to be done on the rpm and TDC sensor mounting (e.g. gap outside tolerance limits, sensor misaligned, etc.), the procedure must be carried out for correct positioning of the sensor and its mounting, and setting its timing, as described in the engine overhaul manual (publication no. 504.589/20).

Checking resistance

The sensor's resistance can be measured by disconnecting the connector and connecting an ohmmeter to the ends of the sensor.

Resistance 1134 - 1386 ohm at 20 °C