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Found 9 results

  1. Hoping to purchase this car.. They ran a DME and this shows only 19 Over Revs in Range 1 with none across the other ranges.. there are a "high"? number of misfires? Is this a concern or perhaps normal and maybe just require plugs / coil packs? My 1st Porsche.. I hope...
  2. Hi All My first post here so please bear with me but pretty desperate for help. Have 2004 Boxster S and its, in general, running a bit rough (feels fuel rich). It also will also, on occasion, not go. Pulling up at a busy intersection and car reduces to Idle. Then put the foot down and the car stays at idle. Normally an engine restart gets things going again (although not always and sometimes requires a few goes). Bought a computer reader and found error codes P0102: Factory Fault code 115 - Mass air flow sensor - below limit P2135: Accelerator Pedal - Signal Implausible P0121: Factor Fault code 117 - Throttle value or accelerator pedal potentiometer - signal implausible P1266: Factory Fault Code 409 - Fuel shutoff function monitor - signal implausible Took the car to Porsche. They suggest a MAF sensor was the root cause and replaced it. It felt better for a few days then problem returned. They replaced another MAF sensor.. Same problem. They then said the MAF reads 0 and have checked the cables so its me DME and it needs replacing (not cheap) Have taken the car back home and looked at the likely affecting values myself from the computer. 1. MAF. The computer shows to different values for MAF Mass air flow (HFM) is always 0 regardless of if the car is working correctly or not and at any accelerator level Mass air flow seems to move within a range of 18 (idle) to 100 (full throttle) 2. Throttle (since it had error codes on this) Pedal encoder potentiometer 1 and 2 always move and the pedal value goes from 0-100% when its working but stays at 0 when its not. Since the potentiometers always move I am assuming the DME simply can't add things up so sticks the pedal value at 0. ie. The MAF sensor reading above confuses the DME and it reduces the throttle to 0. That feel consistent with the behaviour of the car (its just sticks at idle) Any one with any clues? Certainly don't want to replace the DME unless absolutely necessary.... HELP?
  3. LHD, Tiptronic, 1998 Carrera Coupe Hi all, new to the forum but I was consulting some existing threads in the public forums regarding similar and related issues before I started an attempt at this job. I have access to the full wiring diagrams for the vehicle, the pdf is "996 Wiring 1999-2000.pdf" and can be found on google. I had them printed out on large sheet paper so I could trace the wires and go through all the possible issues without having access to factory scanning tools. I'm an electronics and industrial instrumentation technician hoping to build more work experience and reputation in order to get access to more of these repair gigs in the future on higher model cars. I am working on a 1998 Carerra (Japan market) that was installed with a 'fancy' alarm system that sat on top of the existing setup and most of it was removed prior or at delivery, and I spent yesterday inspecting and repairing the wiring harness from the hack job that was previously in there. Today I went through the troubleshooting steps in order to eliminate probable causes of a no-crank. The current owner had ordered a new ACM (alarm control module) and had it re-programmed and had told me the porsche dealer said to him the reason it won't start is a 'wiring problem' which I believe I had repaired all the wiring so far in the vehicle. I still have the old ACM with the car, it's just un plugged in the front storage. After doing my troubleshooting today, I believe it to be the DME but my lack of understanding how the modules interact I'm not sure if it defective or just needing to have some re-programming of some sort which may require a porsche scan tool. Here's a take-away from my notes today; Check for B+ signal from ignition start to pin 30 on START LOCK RELAY SUPPORT REAR when ignition key set to START. B+ present Jumper pins 30 and 87 to test the relay is working. Turn ignition to START and check for engine cranking. Engine cranks. Check for B+ from pin 86 to the relay coil. B+ present Ground pin 85, and turn ignition to START. Engine cranks. Relay is working. Check for current path from pin 85 on the START LOCK RELAY SUPPORT REAR to the DME connector pin 66 ACTUATION START LOCK. YEL/VI/BR wire. There is a path. PIN 66 on the DME is not switching to ground, and this won't let the car crank and start. Check for path of ground from DME pin 68 START LOCK to the shifter PARK and NEUTRAL. It grounds in each position, open in any other. Check for B+ on pin 88 on the DME which is the DIAGNOSIS W LEAD, and the only wire from the alarm leading into the DME. From my understanding of the alarm system from reading the description of operation from my ALLDATA catalogue, there must be some sort of handshaking going on between the RFID in the key fob, the correct serial and cypher in the ACM and the DME in order for this pin 66 to ground to let the car start. Checks at 7.37V with the DME dis-connected, and 8.34V with the DME plug end connected. I also ohmed out this wire 0.2ohm to check for any unusual resistance because seeing that voltage struck me as unusual. Again, I'm not sure of how this system interacts but I can only assume it's correct as I also tried to measure this voltage with the spare ACM installed with the same reading. What I wanted to ask for; Is this a wiring problem, problem in the ACM or DME and what would have to be done to rectify it. Warm regards, Aurelius Attached are three helpful photos of the DME ACM and a sheet that I believe came with the new ACM
  4. I've been all over the internet looking for basic information on the 981 DME. From what I've read it's manufactured by Continental. I'm an electrical engineer and really just interested in learning more about it in general. Does anyone know where I can find out some additional information about the DME such as pinout, processor, flash size, ram, etc..Also is there a diagram of the various controllers used in the Cayman S? Thanks in advance!
  5. Hey everyone Been having some throttle cut out issues and I've been told by 2 different shops that my DME needs to be replaced. I've tried serching for DME threads and just wanted to make sure I can swap a DME set that I found on ebay. 2000 Porsche Boxster 986 Engine Computer Security Immobilizer Set Key 2 7 51 067 | eBay The only difference is my box is a tiptronic and this is from a 5 speed. My box is a 2000 and this set is also from a 2000. Am I ok to do a straight swap without any extra programming? I just don't want to do the swap and try to start the car if it could cause more damage. Thanks for your input/advice.
  6. Alright guys, Trying to do a little troubleshooting without all my books, so hoping you smarty pants on the forum can help me out. What sensors does the ECU look at during WOT? I have some serious stumble/stutter under WOT when I have smooth operation under partial throttle. Thanks in advance!
  7. Does anyone know the layout of the Motronic program and how to update it using a PST2? I just wanted to try to do my own "tune" and couldn't find any instructions on any of the forums. The "tuners" can't be the only ones that can do it. Thanks, Mike
  8. Hellp Please, Just the other day I started getting a hiccup/ hesitation in my 996. First noticed it when I started the car, it typically idles at about 1200 RPM's cold start, however this morning it was at 850 or 900. After 1 minute it was still a bit rough at 750 RPMs. When we started driving I had to press the accelerator a little more than usual. We jump onto the highway ramp and in 2nd :drive: gear floored it at 3900 to 4100 RPM’s BURP BURP and :cursing: then smoothed out up to 7K hit 3rd :drive: gear and right at 3800 to 4200 RPM’s same thing like I took my foot of the gas and then floored it again . As soon as I got home I jumped onto RENNTECH and looked for similar issues, found some like possible, Mass air flow sensor, miss fire in spark plug / wire issue etc. I took it over to the Porsche Dealer and had them run diagnostics on it. They said the error was: ERROR CODE: T107 "ambient pressure plausible signal" Then they proceeded to tell me I needed a new DMA which would cost $2,700 :angry: complete with labor. I told them nope not yet, and decided to get a second, 3rd and 4th opinion. It seems like every time I take the car to them they see the $/ goof tattoo on my forehead. Any assistance or recommendations would be really appreciated!!! Thanks
  9. The immobilizer gave out and had my 99 boxster towed to my local indy. His piwis was out for repairs so he waited two weeks before exploring the problem. The first attempt to reset the new immobilizer (alarm unit) and new key heads failed, I was told that the new immobilizer was bad because it would only read the keys and not reset the immobilizer (alarm unit). So, I order another new immobilizer (alarm unit) and the indy installs it and proceeds to tell me that the newest unit reads the keys and resets but won't communicate with the DME. So, today I go by to check on the status and I am told they've had no luck, here are your keys and you need to have you car towed to a dealer. $900 later all Ive got to show is a parts bill of $800 and shop bill of $900 (Oh they did repair a few actuators for the door locks). Is it possible that the mechanic doesn't know how to use the Piwis tool? Help, anyone ever have this problem with the immobilizer and DME?
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