Crankshaft Position Sensor: Service and Repair

Replacing Aperture Plate:

APERTURE PLATE

Removal
1 Fit special tool 83 93 993 to lock the flywheel.

2 Raise the car, remove the right~hand front wheel and dismantle the wing liner.

3 Compress the belt tensioner and secure it by means of clamp 83 94 488.

4 Remove the multigroove belt and dismantle the crankshaft pulley.

5 Remove the aperture plate.

To Install
Assemble in reverse order.


Belt pulley tightening torque: 190 Nm (140 lb ft)

Replacing Hall-effect Sensor:

HALL-EFFECT SENSOR

Removal
1 Fit special tool 83 93 993 to lock the flywheel.

2 Raise the car, remove the right-hand front wheel and dismantle the wing liner.

3 Compress the belt tensioner and secure it by means of clamp 83 94 488.

4 Remove the multigroove belt and dismantle the crankshaft pulley.

5 Remove the tensioning roller.

6 Undo the alternator bolts (withdraw the upper one half-way out only) and swing the alternator rearwards.

7 Remove the two retaining bolts for the hall-effect sensor.

8 Undo the clips holding the wiring (one on the coolant pipe at the rear of the engine block), unplug the connector and remove the hall-effect sensor complete with wiring.

To Install

Assemble in reverse order.

Use LOCTITE 270 or the equivalent to lock the retaining bolts for the hall-effect sensor and crankshaft pulley.

Belt pulley tightening torque: 190 Nm (140 lb ft)