Porsche 996 TT, Repair Manual

Page: 1159 / 2099

Gyroscope
Note
The gyroscope detects changes in the direction of travel and must be calibrated after commissioning! •
The gyroscope must be calibrated after commissioning only! •
If a system that has already been calibrated is disconnected from the power supply (terminal 30), the
calibration of the gyroscope is retained! •
The gyroscope shows temperature−dependency. This temperature−dependency is compensated by the system
if the "cold" (not calibrated) system is switched on and left to stand for approx. one hour.
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Procedure after commissioning
1. Switch on the PCM with a free panoramic view for approx. 20 minutes (to load GPS
almanac).
2. Drive on a motorway if possible at a speed greater than 60 km/h for a distance of approx. 50 km
(calibration of the distance measurement).
3. Drive approx. 10 km in an urban area and take frequent turn−offs.
4. Stop for approx. 10 seconds occasionally (calibration of the
gyroscope).
5. Switch on the PCM navigation unit for approx. one hour with the vehicle horizontal.
Calibration is necessary after the following maintenance work:
After changing a tyre. •
After the power supply has been interrupted. •
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Procedure after changing a tyre
Drive on a motorway if possible at a speed greater than 60 km/h for a distance of approx. 50 km (calibration
of the distance measurement).
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Procedure after the power supply has been interrupted
Procedure after the power supply has been interrupted: Switch on the PCM with a free panoramic view for
approx. 20 minutes (to load GPS almanac).
996420, 996421, 996450, 996451, 996620, 996621, 996650, 996651
einordnung
Gyroscope 1096