Porsche 996 TT, Repair Manual

Page: 219 / 2099

4 Tests/notes for all−wheel drive
Balancing wheels on vehicle
Power test
Brake test
Towing manual transmission vehicles
Towing Tiptronic vehicles
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Balancing wheels on vehicle
When fine balancing wheels on the vehicle, all four wheels must be raised and must be able to turn freely. If a
fault occurs in PSM (Porsche Stability Management), read out fault memory before fine balancing. After fine
balancing, the fault memory of the PSM control unit must be erased.
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Power test
Power tests can only be carried out on 4−roller type test stands!
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Brake test
Brake tests can only be carried out on roller−type test stands or plate test stands. If no all−wheel drive test
stand (roller−type test stand) is available, the following limit values must not be exceeded for conventional
roller−type test stands: Test speed max. 7.5 km/h Test duration max. 20 seconds.
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Towing manual transmission vehicles
If vehicle is towed with raised front or rear axle, the wheels of the raised axle must be able to turn freely. The
ignition must be switched off and the shift lever must be in neutral.
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Towing Tiptronic vehicles
With engine not running, sufficient lubrication of the transmission is not ensured.
Select position N. Switch off ignition. •
Do not exceed top speed of 50 km/h. •
Maximum towing distance 50 km. •
For longer towing distances the vehicle must be raised at the rear axle or transported on a trailer.
•
996420, 996421, 996450, 996451, 996620, 996621, 996650, 996651
4 Tests/notes for all−wheel drive 156