12 14 520 Replacing impulse sensor (M62): Notes

Special tools required: 

• 00 2 407
• 00 2 550

Interrogate fault memory of DME control unit.

Switch off ignition.

Unfasten plug connection (1).

Fig 1: Identifying Plug Connection

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Unscrew screw. Remove impulse sensor.

Installation 

Observe the following when replacing the transmission, the flywheel or the pulse sensor:

Note whether one or more shims are installed between the transmission housing and the pulse sensor. If one or more shims are installed, the distance between the pulse sensor and the pulse teeth of the increment wheel must be measured.

Fig 2: Identifying Impulse Sensor

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Crank engine at front central bolt so that a full pulse tooth (1) can be seen through opening in removed pulse generator. Make sure that the pulse tooth (1) is exactly centered in the hole.

Fig 3: Identifying Pulse Tooth

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Use special tool00 2 407 or00 2 550 to determine depth to flywheel pulse gears.

Note depth.

Fig 4: Using Special Tool 00 2 407 To Determine Depth To Flywheel Pulse Gears

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Measure depth (A) of pulse generator.

Subtract depth (A) of pulse generator from depth of flywheel.

This result is the gap dimension.

Set a gap of 0.55 +/- 0.2 mm with the shims.

The gap of 0.55 mm should be achieved as closely as possible so as to:

1. Enable exact misfiring recognition.
2. Prevent pulse sensor from contacting pulse teeth.

Fig 5: Measuring Depth Of Pulse Generator

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