Acceleration/Deceleration Sensor: Adjustments
Requirements
- Car parked on level ground (workshop floor).
- Car including trunk empty.
- Fuel tank full (or equal weight in trunk).
- Tire inflation pressure correct.
Checking Sensor Adjustment
- Place Special Tool 34 5 150 with acceleration pick-up (in installed position) and test lead 61 1 440 on console in car.
- Connect ohmmeter of BMW service tester with test lead.
Nominal value: less than 1 k-ohm.
- Increase angle (1) of special tool with screw (2) until ohmmeter displays more than 2.5 M-ohms.
- Remove Special Tool 345 150 and measure distance (A).
- Compare actual value with nominal value table below.
- If measured value is within tolerances, install acceleration pick-up without shim.
- If measured value is not within tolerances, determine thickness of shim.
Examples:
- Actual value 35.6 mm (1.401")
- Maximum value 33.0 mm (1.299")
Min. shim thickness 2.6 mm (0.102")
or
- Actual value 35.6 mm (1.401")
- Minimum value 26.5 mm (1.043")
Max. shim thickness 9.1 mm (0.358")
Adjustment
- If the measured actual value is smaller than the nominal value, install the shim on mounting point (1).
- If the measured actual value is larger than the nominal value, install the shim on mounting point (2).
- Install shim of determined thickness between the console and special tool.
- Recheck switching point.
- If switching point is now within tolerances, remove special tool and install acceleration pick-up with shim and shear-off screws.
- Tighten shear-off screws and lock by shearing off the heads.
- Tightening torque: 6 to 8 Nm (4.5 to 5.5 ft.lbs.).
Nominal Value:
Nominal Value Table
- A maximum of one wedge and three shims (a = 1 mm / 0.039") may be used on one mounting bolt to correct the switching point of the acceleration pick-up in the car.
- If the switching point of an acceleration pick-up in the car is beyond the maximum shim range, the console (mounting point) must be corrected.
- wedge, Part No. 34 51 1 156 827, is equal to 4.9 ... 5.3 mm (0.193 to 0.209").