Limp Mode P169800 Fault

[Stevie B]

Hi Guys,

 

I recently carried timing chain replacement and upgraded injector seals on my 3.0 TDI Cayenne.  Its showing error messages on the iCarsoft POR V2.0 diagnostic:

 

P169800 Fault in steering wheel electronics control unit (CAN drive)

030A88 No communication with steering wheel electronics control unit (CAN bus, chassis)

030A0E Steering angle sensor (steering wheel electronic), function restriction

 

Any help, or advice would be greatly appreciated!

 

PS Ill share the process of changing the timing chains and resealing the dreaded covers.

[Loren]

Since the faults are all steering related - is there any chance that you accidentally disconnected or broke the steering angle sensor.

I do not know if that tester can reset the steering angle sensor. Both Durametric and PIWIS can.

[Silver_TT]

On 8/14/2022 at 8:24 AM, Stevie B said:

PS Ill share the process of changing the timing chains and resealing the dreaded covers.

Please do

[Stevie B]

Thanks Loren, I’ve managed to reduce to just one fault code (fully charged the battery and reset): “Steering angle sensor function restricted”. I’ve tried to process to re-calibrate without success, as per the attached instructions.  

[JFP in PA]

Which probably indicates a problem with the steering angle sensor itself, or communication with the control module.

 

Start by checking fuse 53 (5A) in left dash fuse box.  If that is good, try this:

 

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

[Stevie B]

Thanks JFP