Crankshaft Position Sensor: Service and Repair

12 14 521 - Replacing crankshaft pulse generator (N52/N52K/N51/N53)





Important!
Read and comply with notes on protection against electrostatic damage (ESD protection) 61 35 ... Notes on ESD Protection (Electro Static Discharge).





Important!
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).





Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Switch off ignition

Note:
Installation location of pulse generator for crankshaft is underneath starter motor.
Preparatory tasks:

- Remove intake air manifold Service and Repair





Detach plug (1) from crankshaft pulse generator (2).
Release screw.

Installation Note:
Replace aluminium screws.
Tightening torque 12 14 2AZ 12 14 Electronic Shift Units or Control Units.

Withdraw pulse generator (2) from crankcase.

Installation Note:
Replace sealing ring.





Note:
Check stored fault messages.
Now clear the fault memory.