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Brett968

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Everything posted by Brett968

  1. What you are showing in your picture matches up with this one as far as I can tell: https://www.pelicanparts.com/techarticles/Porsche-Cayenne/40-ENGINE-Valve_Cover_Gasket_Replacement.doc/images_large/pic18.JPG
  2. Gotcha. I see now that the Gogal-branded CCV is not available from Amazon anymore. Bummer! For people that may read this thread in the future, Polar Bear, Inc. should have the correct valve available--albeit for a few dollars more than the Gogal. The trick is getting the right one. It looks a lot like their EX 007 but you will need to verify! Currently selling for $62.79 with free shipping.
  3. Did you try replacing the CCV first (which, of course, is a part of the compressor)? Just curious...
  4. As far as I know, there are two aftermarket solutions for the diaphragm valve from separate manufacturers: a less expensive diaphragm-only solution from a Russian outfit, and a more complete solution that includes not only the diaphragm but the spring, cap, and internal plastic support. In my experience, the Russian-sourced diaphragm does not work properly as the geometry is not quite correct. I have not tried the other option yet--but it looks to be better from the images I've seen. (I repaired my original diaphragm with adhesive and it's holding for the time being.) You can find either of the above options on eBay from various sellers. The second solution is also available on Amazon: http://a.co/3fXpUra
  5. A few relatively easy things that I didn't see on your list: Have you replaced the valve cover gaskets? At this age they are almost certainly rock hard. Check for seeps around the gaskets. These can leak and cause stumble at idle and low loads. Another thing to check is the diaphragm valve for the crankcase vent. These diaphragms are notorious for tearing. It's located underneath a round black plastic cap on the driver's side of the engine towards the front of the vehicle, and is held on by a few tabs. You can inspect the diaphragm by removing this cap--carefully pry it off with a few screwdrivers. Look carefully, sometime the tears can be hard to see. The diaphragm is not available as a separate part from the dealer but there are aftermarket replacements. Keep in mind that some O2 sensor fault codes can be caused by leaks in the intake system.
  6. I also tried the deep vac and recharge with new drier. Then I repeated the same steps with a new expansion valve. No dice. My car never blew cold, even on long road trips. Other than that my symptoms mimicked yours fairly closely. Your high side pressures seem low, and your low side pressures seem high. After I repaired the CCV, as I recall my low side pressures were around 20-25 psi tops. Low side pressures with variable displacement compressors tend to be lower than those of older clutched compressors--so you can disregard all those online pressure charts (which are targeted to old clutched compressors). My high and low side pressures before I repaired the CCV were similar to what you are seeing.
  7. OP, you might want to check out some of my posts on a similar issue I had with my car. Your symptoms match mine quite well. The problem was the compressor control valve (CCV):
  8. I agree with the others. It sounds like they are parts slinging at your expense instead of performing a proper diagnosis. The Motronics version used in these cars has sophisticated algorithms for detecting faults in components such as the MAF and provides "limp-home" modes that should keep the engine running, albeit not optimally. So to answer your question, a bad MAF would not normally exhibit the symptoms you described at all. It is highly unlikely that a bad MAF would kill a DME or that a bad DME would kill a MAF. You should be able to pull the electrical connectors to both MAFs and the engine should start and run.
  9. Are you able to communicate with the "Gateway" controller using Durametrics? It isn't clear to me if your vehicle has the gateway built into the instrument cluster or if it is a separate unit. If you can't communicate with the gateway then I suppose it is safe to assume that the gateway is internal to the instrument cluster on your car. In that case, then what you posted is all the diagnostic info available. I have no idea what the Kenwood CAN interface might look like. Can you find some part number on it that you could google? I'll briefly try to explain the topology of the CAN system on the Cayenne. There are three separate CAN networks: Drive, Comfort, and Infotainment. Each network uses a twisted pair of wires to allow communication between all computers on that respective network. Any fault in the wiring can bring down the whole network (limited communication is available in a single-wire "emergency" mode). This should make it obvious why powertrain controllers are on a different network then things like power seats, etc. The networks can exchange messages between other networks through the gateway. 469 is telling as it suggests that you have a wiring problem on the CAN Infotainment network. The Infotainment network includes PCM 2.1, wipers (?), and compass. This explains your wipers and radio controls not working. It also explains error code 459. I don't understand how it could trigger the first three fault codes as these are related to the Comfort CAN network but then again it's not unusual for faults to trigger "limp" algorithms with rather unexpected behavior. Anyways, I thought pulling the aftermarket radio CAN interface was an obvious first thing to check as it's one of the few modules using the Infotainment CAN network and you are clearly indicating a wiring fault on this network.
  10. Even if it is hooked up correctly the radio may have developed a fault that is taking out the CAN line. Is your aftermarket radio interfaced with the steering wheel controls? I would do this. First, check the "Gateway" computer for fault codes. Then -- depending on the fault codes -- pull the stereo and disconnect the CAN lines. You don't have to know which exact wires are the CAN lines, just pull all the connections to the stereo. If your radio uses a separate CAN adapter then be sure to disconnect the factory wiring from that also. After doing this, see if the problem is still present.
  11. Sounds like a CAN communications problem. Check the fault codes stored in the "Gateway" computer. Do you an aftermarket radio by chance? If it is wired incorrectly it could kill the CAN line. Correcting the wiring will rectify the problem in that case.
  12. I feel the same way about my cars. Hopefully it's just a wiring issue somewhere. BTW, the ground for the control side of the relay is the ground for the DME (pins 1&2). The other relevant ground point is the ground for the fuel pumps themselves. The manual isn't very good at spelling out exactly where this is. According to the wiring diagram, the point is MB33 and it is located at the "top left of "C" pillar". However, in the "grounds location" section of the manual it says MB33 is "near center of vehicle". I think RFM's post describes where the actual location is.
  13. No doubt that failure of an unmolested DME is a rare event. It can and does happen though. Has the DME ever been opened for any reason (e.g. chip tuning)? If it came down to it, there is an inexpensive way to replace the DME; just buy a used DME off ebay and copy the immobilizer data from your original DME to the replacement. The only issue is finding someone with the equipment to copy the immobilizer data off of the diagnostic EEPROM. As for the wiring diagram, I don't believe I am allowed to post that here as it is copyrighted material. If you look around you can probably find the full factory manuals for a very reasonable price. @Lewis- Yeah, LOL, I thought the 2 dry solder joints story sounded fishy.
  14. OK, so let's explore the possibility that the fuel relay fault code was not due to you pulling the fuse but that it is indicating some actual fault. I'm assuming that when you say it is still throwing the fuel relay code that this is after erasing the fault codes (i.e. the fault code is returning on the next start attempt after be cleared.) Things to check: Connectivity check between pin 37 (GRN/BLU wire) on DME connector and terminal 85 on the right fuel pump relay The same between pin 65 (GRN/RED wire) on DME connector and terminal 85 of left fuel pump relay If this checks out then check connectivity between each of these wires and ground (separately of course) with ignition OFF. Should be infinite. Check connectivity between each of these wires and ground after engine is started (you'll have to splice in). In the brief 10 seconds that the engine runs the resistance should be low (less than 5 ohms probably), indicating that the fuel pump relay is being activated. Alternatively you can measure voltage across these wires and +12 during the same conditions. If all of this checks out then I would look at the DME. It could be that the fuel pump lines are being driven low correctly (this would activate the fuel pumps) but there is a problem inside the DME with the load detection circuitry on one of the two pins. (The DME switches each of these fuel relay pins from a high impedance state to low (ground) and then a separate part of the circuit measures the current running through each pin to determine if the circuit is behaving as expected. This is reported back to the DME microcontroller. All of this is integral to the DME.) If it gets to this point I can give you some pointers but you will probably need someone comfortable with electronics to perform the checks. (Disclosure: In my former life as an engineer I worked extensively with Bosch Motronics electronic hardware as well as software calibration / algorithms.)
  15. Charles, OK, but did you follow the procedure that Lewis stated exactly? (only pulling fuse 14) I'm still not at all convinced that the diagnostic data is correct. After the engine dies what does the fuel pressure gauge read? When he checked each pump did he relieve the system pressure between the tests?
  16. That thread doesn't say anything about which fuses to pull. You said you pulled fuses but are you sure you pulled the correct ones? Left fuel pump is fuse 14 in water box and right is 13. Both are 15A. Are you 100% certain that the fuel pressure is still being maintained when the engine dies after 10 secs?
  17. OK, that totally changes things. Much less likely to be a problem with fuel quality if you drove on it for 1.5 hours without issue. I like Lewis's idea of looking at the plumbing inside the tank.You could be pulling in air with the fuel. BTW, as I understand it the secondary battery was standard up to MY2004 and then optional from that point forwards.
  18. (my last post was a cross-post with Charles) Charles, you said you had the problem 1.5 hours after getting gas. Was that 1.5 hours of driving time? I'm confused because you said the tank was completely full but if you drove on it for 1.5 hours after filling up then surely it couldn't be.
  19. Highly unlikely it is a fuel regulator / filter / or inadequate fuel issue as it makes pressure unloaded and very little flow is required for engine idling (he says it only idles for 10 seconds and maintains pressure throughout). A split hose in the tank is feasible, causing some air to be pulled in, but he indicated his tank was full so the break would have to be near the top of the tank to cause an issue. My money is on bad gas (e.g. water contamination).
  20. Interesting. Since the 0907 electrical load management DTC is the only potentially relevant fault code being reported, I would be inclined to figure that one out--even if it is not entirely obvious how this would cause the problem you are seeing. It's also possible that the battery is just a bit run down from all the cranking and this is triggering the DTC. If that is case then the DTC has no relevance to your problem. Does your car have the optional secondary battery in the trunk? As for the fuel pumps, I agree with you. If you are seeing 65psi, even with the engine not running at all, then you should have adequate volumetric flow for the engine to idle. If the engine was cutting out during partial or full load then you might want to measure fuel volumetric flow. It sounds like your fuel pumps are fine. I just had another thought. By chance, did this problem begin shortly after getting gas? Water in the tank or bad gas maybe?
  21. The load management error is indicating that non-essential electrical circuits are being shut down because proper battery voltage cannot be maintained. In other words, your battery is likely on the fritz. This isn't an engine ECU fault code, it's coming from the central electronics module (I think Porsche might refer to it as 'Electrical System' module). Anyways, bad battery is a possibility. It kinda sounds like a problem where the immobilizer is activating somehow and shutting off the engine. Perhaps an ECU is resetting due to a brown out. I could see this causing some really weird behavior. Are you sure that your mechanic is interrogating the engine ECU with a Porsche specific diagnostic tester and not a generic OBDII scanner? I find it hard to believe that there are no engine DTCs being stored.
  22. In the passenger's side fuse box in the side of the dash, check fuse 57 (40A), as well as fuses 44 (5A), 40 (10A) and 7 (5A). Brett
  23. Sorry, I didn't mean to imply that this problem should be simple for any owner to solve. I was trying to say that if you get it to the right shop that they should be able to diagnose and fix the issue without much trouble. Unfortunately, as you have probably already found, the servo motor and ECU are not particularly cheap parts. Even though it is extremely likely that these two parts are what you need to solve your problem, I recommend always getting a proper diagnosis to ensure you are not simply throwing parts at the problem. In my case the damage to the stepper motor was obvious once I removed it and opened it up. As to your specific questions on the parts: I would avoid a remanufactured stepper motor. You also want to make sure that you are buying the revised version of this part. This is the one I bought two years ago when mine went: http://www.rmeuropean.com/Products/95562460101-MFG58.aspx. You are correct that the Touareg is the same. On the linked site the VW and Porsche part numbers x-ref to the same part and are priced the same. The ECU that you linked to has a 2003 manufacturing date on it (09.10.03), so this is most certainly not the updated version of the ECU and it wouldn't be any better than the one currently in your car. It may be hard to find the updated unit on eBay. I tried but gave up and ordered one from the dealer (Porsche p/n 955-618-023-05). Part of the problem is that many cars have not been updated. Another problem was that I did not know what the corresponding VW part number was for the updated ECU (this is the 9-12 digit number that starts with 0AD) and this is the only part number listed on the ECU label. However, if you can find a 03-06 Cayenne transfer case ECU on eBay with an Oct. 2009 or later manufacturing date then it is probably correct. Again, the easy way out is to order the ECU from the dealer. Brett
  24. My suggestion is to bring the car to a shop with a proper Porsche scanning tool, or find a buddy with one, and scan the A/C module for fault codes. It is futile to try to diagnose this problem without more information. Oh, and when you get the fault codes post them here and you should get some guidance on what to do next. Brett
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