Farhad12345

Hi, I think comprehensive Porsche Workshop Service manual is 9700 pages. Other manuals could be incomplete and missing most informative features like wiring diagrams and etc.

Hi gbratik, Here is the step by step instructions on how to fix this problem. FAULT CODE 0778 STEERING-ANGLE SENSOR CAUTION: The steering-angle sensor must always be initialized 'control lamp on' whenever the battery terminal is disconnected. Diagnostic conditions  Ignition on  Internal level control module function test Possible cause of fault  Initialization/calibration not performed (no display/no or incorrect basic setting/adaptation)  Mechanical fault  The signal received from the control module (level control) via the CAN drive does not correspond to the expected signal (implausible signal)  CAN drive faulty (no signal/communication)  Steering-angle sensor faulty Affected pins Level control module, plug A:  Pin 61 'CAN drive (high)'  Pin 81 'CAN drive (low)' DIAGNOSIS/TROUBLESHOOTING Initializing 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 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 IF DISPLAY OK After successful initialization, the stored fault code is erased from the fault memory and the NRA control lamp goes out. IF NOT OK go to step 2 2. Check steeringangle 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. IF DISPLAY OK After successful calibration, the stored fault code is erased from the fault memory. IF NOT OK go to step 3 3. Mechanical fault Examine moving parts for damage and check mobility. IF DISPLAY OK go to step 4 IF NOT OK The steering-angle sensor is integrated into the steering column switch and must be replaced along with this if its functionality is mechanically impaired. 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 IF NOT OK Repair wiring harness circuit. 5. Check CAN drive Localize faults in accordance with CHECKING INSTRUCTIONS/CAN DATABUS If CAN drive is OK go to step 6 IF NOT OK repair wiring harness. 6. Replace steering-angle sensor The steering-angle sensor can only be replaced together with the steering column switch. IF NOT OK go to step 7 7. Replace level control module That`s it. Hope it will help.