Fault code 0778: Diagnosis/troubleshooting: Initializing

WARNING: This page is about a different car, the 2006 Porsche Cayenne, 2005 Porsche Cayenne, 2004 Porsche Cayenne, and 2003 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

The steering-angle sensor in Cayenne must be initialized after the following work is carried out:

Whenever the power supply is interrupted (NRA control lamp on).
The steering-angle sensor must be calibrated after all work on the running gear.

NOTE: Calibration of the steering-angle sensor must be performed on a measuring platform. First, the level control module must be coded successfully and the steering-angle sensor must be initialized. The steering-angle sensor must be calibrated after work has been carried out on the running gear in the area of the front axle.

DIAGNOSIS/TROUBLESHOOTING PROCEDURE

Work instruction			Display OK	If not OK
1	Initialize steering-angle sensor	Switch on ignition. Position wheels straight ahead. From the straight-ahead position, turn the steering wheel approx. '15°' to the left and '15°' to the right (past the straight-ahead position). Drive the vehicle straight ahead at a speed of '> 4 km/h for at least 1 second'.	After successful initialization, the stored fault code is erased from the fault memory and the NRA control lamp goes out. → End	Go to Step 2
2	Check steering-angle sensor calibration using 9588 Porsche System Tester II	Running gear set according to Porsche specifications. Wheels in straight-ahead position and steering wheel horizontal. Steering wheel may be turned by max. '± 2.0°' from the horizontal position for driving straight ahead.	After successful calibration, the stored fault code is erased from the fault memory. → End	Go to Step 3
3	Mechanical fault	Examine moving parts for damage and check mobility.	Go to Step 4	The steering-angle sensor is integrated into the steering column switch and must be replaced along with this if its functionality is mechanically impaired. → End
4	Read out steering column switch control module, fault memory and check circuit for short or open circuit	Eliminate faults in accordance with 'Diagnosis/troubleshooting' for steering column switch control module.	If electric circuit is OK: Go to Step 5	Repair wiring harness circuit. → End
5	Check CAN drive	Localize faults in accordance with CHECKING INSTRUCTIONS/CAN DATA BUS .	If CAN drive is OK: Go to Step 6	Repair wiring harness. → End
6	Replace steering-angle sensor		The steering-angle sensor can only be replaced together with the steering column switch. → End	Go to Step 7
7	Replace level control module		→ End