Cayenne 9PA 3.2 2004 four wheel drive ABS and PSM problem

[AlexUK]

Hi all,

 

My 2004 Cayenne 9PA 3.2 has suddenly developed a fault. It started by saying "four wheel drive error" on the dashboard and shortly after "ABS failure" followed by "PSM" failure. The centre console four wheel drive system switch (behind the gear change) is also not working (LED light not going on if the dial is moved).

I changed the battery with a brand new one, top of the range and went to my local friendly Porsche mechanic who run it through diagnostics, cleared codes and they popped up back again which he then attributed to an electrical fault in one of the cables. As he is a mechanic and does not cover electrics he suggested I find a specialist that covers electrics.

I checked all the fuses and they look ok.

The car drives ok but when started it seems like it is trying to lock the wheels (like when in the past the PSM would engage).

Any help? I have a tester so would not mind checking continuity of ground points etc, but rather than taking the whole thing apart it would be great if any of you has a suggestion - which would be greatly appreciated.

Thanks in advance,

Alex

[lewisweller]

23 minutes ago, AlexUK said:

Hi all,

 

My 2004 Cayenne 9PA 3.2 has suddenly developed a fault. It started by saying "four wheel drive error" on the dashboard and shortly after "ABS failure" followed by "PSM" failure. The centre console four wheel drive system switch (behind the gear change) is also not working (LED light not going on if the dial is moved).

I changed the battery with a brand new one, top of the range and went to my local friendly Porsche mechanic who run it through diagnostics, cleared codes and they popped up back again which he then attributed to an electrical fault in one of the cables. As he is a mechanic and does not cover electrics he suggested I find a specialist that covers electrics.

I checked all the fuses and they look ok.

The car drives ok but when started it seems like it is trying to lock the wheels (like when in the past the PSM would engage).

Any help? I have a tester so would not mind checking continuity of ground points etc, but rather than taking the whole thing apart it would be great if any of you has a suggestion - which would be greatly appreciated.

Thanks in advance,

Alex

Lift up the driver side carpet check the wiring harness bundle for broken, corroded wires and bad joints both soldered and crimped. If the carpet is wet you will need to find the culprit for that as well to prevent further issues. Sunroof channel holes front left and right alway block on mine with sand from Desert climate but also evaporator drain can block and drip AC water into foot well. 

Loads of threads about this ...........

[Mr.Flip]

There is a TSB about the transfer motor going out. Maybe it's what happened with yours:
3
19/10 ENU 3978
Mar 26, 2010
Transfer Gear: Servo Motor and Control Unit
(19/10)
Model year: as of 2003 up to 2010
Vehicle Type:
Cayenne/Cayenne S/Cayenne GTS/Cayenne Turbo/Cayenne Turbo S
Equipment:
Porsche Traction Management (PTM)
Concerns:
Servo motor and control unit for transfer gear.
Information:
- Display in instrument cluster: "All-wheel drive system defective",
- Fault code 2033, 2039, 2041, 2042 in transfer gear control unit.
This is caused by overheating of the servo motor in the "Low Range" driving program afier driving long distances due to a fault in the transfer gear control unit. As a result, the fault codes specified above are entered in the control unit.
A modified transfer gear control unit is installed since October 30, 2009.
Date of Introduction:
October 30, 2009
Action Required:
In the event of a complaint, replace the servo motor and install a new control unit.
Control unit
Model year 2003 to 2006: ----> 391319 Removing and insta11ing transfer gear control unit.
Model year as of 2008: ----> 391319 Removing and installing transfer gear control unit.
Servo motor
--> 397819 Removing and installing servo motor on transfer gear.


Parts Info:
References:
--> 391319 Removing and installing transfer gear control unit
--> 391319 Removing and installing transfer gear control unit
--> 397819 Removing and installing servo motor on transfer gear


Sent from my iPhone using Tapatalk

[lewisweller]

This may help. 

Pm sent .....

Edited July 19, 2017 by lewisweller
removed Porsche copyrighted material

[Brett968]

Most likely your transfer case servo motor has bit the dust. It's pretty easy to remove and open up to inspect. When mine went one of the motor windings had melted. If/when you replace it, make sure to replace the transfer case ECU at the same time. Supposedly there is a design fault in the early transfer case ECUs that can cause them to burn up the servo motors (hence the TSB mentioned above). You may be able to find an updated transfer case ECU on eBay, otherwise you will need to order it from the dealer. The good news is that both the servo motor and the ECU are very easy to replace.

 

Brett