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By Niklas 71
Car: Cayenne turbo 2004, 250 000 km
The problems have been cascading over the summer, starting with a trashed rubber bushing on the cardan shaft support bearing. Before I got home and could fix that (thanks to a great description found in this forum!), the PSM and ABS lights went on. I guessed it was caused by the occasional knocking and wobbling of the cardan shaft.
After fixing the support bearing, the lights stayed on, so I bought an iCarSoft POR II to read fault codes. For some reason, it couldn’t pull codes from the PSM, but there was a fault code in the gearbox controller, about a lack of speed signal from the rear left hand wheel.
I gladly bought a new ABS sensor and replaced it, with no luck. I could remove that fault code but the lights returned and I still couldn’t pull codes from the PSM.
Next, I lifted the floor mats and found a lot of water on the passenger side from a blocked sunroof drain. Much of the wiring was corroded, so I carefully replaced it wire by wire. At the same time, I put in a new battery since the old one was really weak. The car started and ran fine, but the PSM and ABS lights kept coming back.
Next, I wanted to inspect the PSM, so I lifted the plastic cover beneath the wind shield and disconnected the DME in order to get down to the PSM.
The PSM connector looked fine without any traces of corrosion. The same was true for both DME connectors. I just brushed off some dust and put everything back together.
Here’s where my biggest problem occurred: now my car won’t crank the engine at all. When I turn the key, the instrument screen says that “daylight running lights are not active” or something similar. The cooling fans revv up to max but nothing more happens.
i have tried disconnecting the battery for an hour and then reconnecting again without any different behavior.
Any ideas on how I can bring my car back to life again?
Niklas in Sweden
2002 Carrera 4S. I did a search and didn't see these exact symptoms simultaneously.
See attached picture. I was driving at 5k RPM in 3rd when the power of the car was suddenly reduced (by the computer I believe) and the console beeped displaying the following 4 checks: 1. Brake distribution 2. PSM failure 3. ABS failure 4. Battery -- also, as you can see in the pic, the battery voltage meter is maxing out. When I disengage the clutch from the engine the voltage drops some (and the brake/PSM/ABS messages go away and are temporarily ok) but is still running significantly higher than what I'm used to seeing. Could this high voltage be damaging to the electronics system? Presumably there's something going on with the voltage regulator. Does the ABS/PSM turn off automatically for saftey when there are voltage spikes?
My battery is an Interstate and is ~ 1yr old. This seems to me like the alternator (possibly the voltage regulator). I realize it would be better if I had a Durametric to hook it up to and get the exact error codes off of. That may need to be done to properly diagnose what's going on here.
Thanks in advance for any help/input.
Yesterday, when I returned from a drive of about 30 minutes, I saw the Four Wheel Drive system Faulty message on the display. After about couple of hours, I started the car and the warning showed up again. I took it for a 5 minute drive, turned off, restarted it and the warning showed up again, decided to drive it back home, but it was a bit jerky when it started moving from rest and then gave PSM failure warning and then Lock overloaded warning. Was able to drive it home without any more jerkiness.
I doubt that it is battery related but will have it checked.
One thing I noticed is that the front tires are worn from sides only as the front LCA need to be replaced. Could these cause these warnings? Or is something else going on?
Odd one for the group here:
I have a 2004 Turbo Cab (manual) with X50 that I have owned since early 2010 and put around 30K miles on in that time (Bought with ~20k miles). I recently found a 2004 Turbo Cab (Tiptronic) with ~29,000 miles that was such a good deal that my parents purchased it. I drove the thing recently while visiting and a couple times in constant-radius turns on back roads, the PSM intervened out of nowhere (The first time it happened I actually thought I hit a shift button with my thumb and downshifted mid corner). Anyway, I got it to intervene once more in a pretty benign turn. There certainly wasn't 7 degrees of slip angle and I have to push my own car much harder (read: screw up the corner entry) to get PSM to intervene. I guess my question(s) is/are this: Is there a difference in the PSM software between the Tiptronic cars and Manual?, a malfunction in the Tip?
Very interested to hear the responses. Thanks
I was troubleshooting code P2189, undo some vacuum line to test for leaks ... this is a different issue all together. I mentioned it because I unhooked vacuum lines. I reconnected everything (hoses), I did not start the engine because I was still working on it. My engine was running fine for weeks even with P2189 - not rough like some mentioned!
Two days later, In the morning, I used the car to do errands, I drove for about 10 minutes. At the stop sign, I stepped on the brake, the car won't stop like it used to! It rolled slowly and then stopped. It's like taking a much much longer distant to stop. I did not see anything abnormal on the dashboard except for the CE for the P2189 code! no smell of anything. I continued to drive the car at the normal speed (35 mile/hr) but kept a large distance from the car in front. About 10 minutes later, the brake felt normal like nothing had happened. I drove for another 10 minutes to reach my destination. 2 hours later, jumped in the car to drive home, the brakes felt normal. About 2 minutes the PSM light came on, brakes are still OK. 5 minutes later I pulled into the bank, turned off the engine for couple minutes then restarted the engine, the PSM light is OFF, the brake is normal... I drove home.
Now, where do I start troubleshoot the brakes and the PSM light? I don't have the Durametric tool. Or must I have the Durametric to troubleshoot? can I rent one from someone?
Your help is needed.
Thank you in advance for your assistance.