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Papagut changed their profile photo
I have a development to share: after nearly 10 years, this same set of symptoms suddenly returned for me: brake proportioning, PSM, ABS, speedometer - all offline + can't put it into gear. I went straight to the same place that caused me trouble all that time ago: drivers side, under the carpet, right about where the footrest is, and exposed the wiring harness. Of all the reconnections and cleaning up that it did - there it was: one small power line had become corroded and broke loose. Cleaned and reconnected, all systems immediately back up. I'm not saying that there are not other causes for this trouble, but only posting this in the hopes that I can help another member out. Here is a post-repair picture, the red lines you see looping back upward in the centre of the image - those were my culprit. The thinnest of them had come loose. Hope that this may help someone out.
Just in case anyone comes across this thread trying to solve unstable idle issues, bigbuzuki was on the right track. I replaced the vapor canister purge valve, pretty easy and inexpensive, and the crankcase breather check valve, even easier. the purge valve may have been a contributor, but the check valve was the main culprit. What is interesting here is that all of my ventilation hoses were intact and without leaks, but if you peered inside the removed check valve, you could clearly see that the membranes inside had completely disintegrated. That immediately did the trick.
I am thinking this is definitely a likely cause too. I replaced the ones running over the top of the engine a while back, they are all nice and intact, replaced the air-oil separator gasket, that has a nice seal now too, but the line that runs downward on the drivers side front of the engine - that is where I will look next. I think I will start a new topic specific to my idle issues with the codes that I am getting.
Thanks for that information, I'll check that off my list of possible causes for my unstable idle issues.
I just removed and cleaned my throttle body as a step in trying to get a nice stable idle, and I noticed that at rest, the plate is slightly open. Here are a few pictures to illustrate it - is that a normal state? After cleaning it, and it was moderately soiled, I also attempted to reset the adaptations via Durametric. Following the instructions, it says that once completed, the final value will read 14 - mine started at 11, and after following the process - ended right back at 11. Not sure if that is related so I thought it best to note that too. No other significant errors present. Thanks, Mark
So, in the end I never got to try this solution... There was a HUGE storm in Calgary, flooding everywhere, and I was caught in it. I had to drive through mabye 24" of water at one point. It was something else! Anyhow, I park it for the evening, and when I go to fire it up the next morning - problem solved! Something obviously happened on that trip that caused it to reset in some way - but as soon as the back end dropped, it returned to level and is functioning normally. So, if you find yourself in the situation I did, I would definitely try bleeding off some air like wrinkledpants and paqueras are suggesting before replacing the module or valve body, which are pretty expensive. Or of course, just drive into the nearest lake - that clearly seems to work! Thanks, Mark
Strangely, I was wondering about giving that a try - I have the cover off at the compressor and will give it a shot and post back
Hi, I have an interesting issue: my front wheels will adjust ride height, but my rear wheels will not - they are stuck in the highest position. When I start it up, I can hear the system attempt to raise the back end further, but since it is at it's maximum, this causes a system error eventually that locks out any manual adjustment. I suspect that this started when I did an extended job on this car and the right rear had a slow leak in the system someplace, and eventually dropped down to a very low position. What I thought I would find is that the height sensor on that corner may have broken - but no, all looks fine (sensors at all corners look fine). When first start the car, the height adjustment is active momentarily, and if I adjust it, the front wheels will respond - the rear wheels will not. My first instinct was to calibrate with Durametric, but that requires the suspension to be in the normal position, and I cannot get there with my back end stuck way up in the air. It is as if air can enter the rear end but cannot escape, or that the vehicle believes that the rear end is in a lower position than it is in reality. Any suggestions on how to proceed? Thanks, Mark
Hi everyone, I have a slow oil leak happening at the far front drivers side of my 2004 Cayenne Turbo. I have it down to a fairly small area, but am not sure about the likely source as the whole area is a bit fouled up. Would you let me know what you think would be a likely source? I lose about 1 litre over maybe 6-9 months. First image is from inside the left wheel well looking forward, second and third images are from underneath the same location from different angles. Thanks, Mark
Thanks, I am sure it is a break in the signal someplace, and there are plenty of modules under the passenger seat along with another in the cubby, which doesn't look like a typical amp to me - but I am going to have a good search for that connector. When I pulled the head unit, I had a good look at the connector. The thing is, I cannot seem to locate that same connector or set of lines anywhere else. Well, not immediately apparent anyhow. Would you expect it to be bundled within a wiring harness along with standard wiring? I'll post back with what I find.
I'm back at work on this error - still unresolved. I did remove the head unit, checked all the connections, and paid special attention to the MOST connector - all seated nicely. I would now like to check that same connector at the navigation unit and amplifier, but am not certain of their location. I have had a fair amount of this car apart and have seen all kinds of modules, but none so far with that MOST connector. Can anyone shed some light on the specific locations - if I can get even a general or typical location, I will be able to ID the proper cable and check the connection. I do not have the CD changer in this vehicle, but do have a subwoofer in the back where the spare would be - and there must be an amp in there someplace to drive it. Thanks, Mark
It's been a while, but I have an update on the squeek / hiss I was getting as the brake pedal is released. I did check the vacuum line and booster pump, that does seem relatively common for causing some issues. I had thought that perhaps a split and weak vacuum was causing what I was hearing in the cabin - but no, everything was in good shape. So, I removed the panel in the cabin where the pedals are and with the engine running - and it took a while to locate - I identified the culprit as the rubber boot that surrounds the rod that the brake pedal depresses. To elaborate: the boot is fixed to the end of the rod that is closest to the pedal, and when you push it in, it collapses the boot like an accordion - as it should. However, when I released the pedal, the other end of the boot pulled away from the back wall also, and as it did, a hiss and squeek would be produced. It is hard to access, but if I worked my hand to the back of the boot and just squeezing or moving it a little would produce the same hiss. It didn't make sense for the boot to move at that back end, so I pushed the base backward. I believe that the back end of the boot had come loose, and sliding it backward remounted it - although it probably only moved back maybe 5mm. Once done, when depressing the pedal, the back of the boot is now stationary, and it collapses / expands as it should - more importantly, it instantly eliminated the squeek and hiss. I'm not certain how long this fix will last, or if the boot coming free is a sign of something else (my brake booster pump was getting fairly hot - weak vacuum, but not enough to trigger fault?), but for now, the problem I originally posted is resolved. Picture of the boot attached - hope this helps if you are experiencing anything similar. Mark
Thanks for the image. I am quite certain it is seated properly into the rear of the head unit, but am going to double check. I will post back with the results as I move along. There has been a lot of electrical work on this truck - but it has been me that has been doing it. I think a break in the loop is a very good possibility, I definitely feel it is behaving as if modules are not present. I understand what you are saying about the "loop" - but this cable must enter and exit modules in other locations in the vehicle. I am thinking as a first step to check the terminal connections at each module in the loop. Where do you find the various components in the system typically?
Good suggestions. I am pretty sure I have tried a rest, but I will give it a go again and post back the results just to be thorough. As for MOST / optic cable: where is the MOST module located - perhaps I can check the terminal ends of the optic cable first, then try just running an optic cable of my own through the cabin to rule a cable fault out.
Hi there, I am experiencing some trouble with my head unit, here are the details: basic info: - moved from Ontario to Alberta, nav was functional in ON, did not have map disk for AB, so did not bother trying to use till recently when I purchased the proper disk. - nav is PCM 2.0 software 3.0, all other functions are normal symptoms: - after startup, get strange error: Unknown, unknown... image is attached - info < shows no satellites detected - date incorrect - nav slow to startup - when map starts, compass says north, points downward in display rather than upward as it usually does, does not rotate map as vehicle changes position - current position in long / lat. is fixed and incorrect - somewhere in the middle of the ocean - map will eventually come up, but vehicle position is fixed and never changes - previously, when selecting AV, you would get a "not present" message, now you get a blank screen attempted fix: - removed head unit, checked all connections, particularly GPS - removed spoiler, checked and replaced GPS antenna (fairly corroded), checked ground connection - took to dealer to run diagnostics, they read error codes of 8005, 8006, and 8007, and provided me with a complete diagnostic printout, so I should hopefully be able to provide additional details if needed. Any help would be appreciated. Thanks, Mark