Anybody have a 997 TT ECU/DME go bad?
The local Porsche dealer is trying to figure out why my 08, Champion 700hp
GIAC flash, TT won't start and throws all kinds of codes, PSM,ABS,Indicator fail, etc..... Started and drove fine the first 2 weeks I got it, first of Nov, then started having start problems. Of course they want to blame the ECU because it has an aftermarket flash. Anybody? |
Have you tried talking to GIAC?
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Originally Posted by Jeff C
(Post 4001823)
Have you tried talking to GIAC?
Yes, talked to both them and Champion, neither thinks it has anything to do with the flash but my local P dealer is not mod friendly and are trying to blame the software. Nobody seems to have seen an issue like this before, if it is the ECU I doubt it was the flash as it has been in the car for years. The Porsche Tech rep is in on it so maybe something next week. |
When an ECU gets flashed there is no removal of any chips taking place. I can't see how a flash does any harm to the circuit board or any soldered connections.
Dealers are !d!_t$. All they can do is swap parts. No talent at a dealership. If you need a new ECU, I happen to have an extra one. |
Originally Posted by Zbird
(Post 4001971)
When an ECU gets flashed there is no removal of any chips taking place. I can't see how a flash does any harm to the circuit board or any soldered connections.
Dealers are !d!_t$. All they can do is swap parts. No talent at a dealership. If you need a new ECU, I happen to have an extra one. Yep, the guys here in Salt Lake seem to be of the mind that if you put in an aftermarket mirror the world will end. I might need one, more next week, but like you said, I think it's something else. One would think they could bench test the ECU. |
Like anything, a PCM can fail. However, it is the last thing that should be blamed. I may advise that you look into some other options aside from the dealer.
If data is cleared from the PCM I wonder what codes are setting first. There is a flow chart to every trouble code, and I hope that the dealer is following the directions. In my experience with gremlins, I would lean towards a ground/corrosion issue. Good luck Mike |
Originally Posted by svoshop
(Post 4002039)
Like anything, a PCM can fail. However, it is the last thing that should be blamed. I may advise that you look into some other options aside from the dealer.
If data is cleared from the PCM I wonder what codes are setting first. There is a flow chart to every trouble code, and I hope that the dealer is following the directions. In my experience with gremlins, I would lean towards a ground/corrosion issue. Good luck Mike I assume you meant ECU vs PCM;) They are telling me, the service writer, haven't talked to the tech yet, that the ECU is not seeing "fifteen power" and a lot of modules are throwing fail codes. They changed the PAS (alarm/immobilizer) module but did nothing. I agree on the power issue, as for some reason the car is seeing low voltage, but the dealer says they have traced all wires, not sure if I buy it. |
It might be worth your while and ultimately cheaper to send the car to GIAC. I have no faith in dealerships, they basically get the cheapest tecs they can get and generally promote out the good ones as they don't want to pay them. All they know to do is confined within the standard car settings and components.
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Originally Posted by rdf16
(Post 4002060)
I assume you meant ECU vs PCM;)
They are telling me, the service writer, haven't talked to the tech yet, that the ECU is not seeing "fifteen power" and a lot of modules are throwing fail codes. They changed the PAS (alarm/immobilizer) module but did nothing. I agree on the power issue, as for some reason the car is seeing low voltage, but the dealer says they have traced all wires, not sure if I buy it. Mike |
gas cap on all the way? LOL... I just had my gas cap a little loose on my other car and it was throwing CEL, VSC off, trac off. This is really stupid IMO - a loose gas cap turning off traction and stability control during the snow storm. At least I figured it out quickly enough.
This thread makes me NOT want to get a tune on my Turbo S. Maybe I'll just keep it stock. |
Originally Posted by 3Kidz
(Post 4002349)
gas cap on all the way? LOL... I just had my gas cap a little loose on my other car and it was throwing CEL, VSC off, trac off. This is really stupid IMO - a loose gas cap turning off traction and stability control during the snow storm. At least I figured it out quickly enough.
This thread makes me NOT want to get a tune on my Turbo S. Maybe I'll just keep it stock. tune as the car was upgraded when it was new, 2008, and never had this problem and there are thousands of tuned/"chipped" cars out there. I do not know what the mechanic has ruled out, I am going in this week to talk to the guy who is actually working on the car and see what codes it is throwing. I am willing to bet it is something as simple as a bad ground, alternator issue, voltage regulator, something to do with voltage or a bad module not the ECU, how often do you hear of an ECU just going bad unless there was a power surge or something similar? |
I bet is the battery, when was the last time it was replaced ?
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Originally Posted by 3Kidz
(Post 4002349)
gas cap on all the way? LOL... I just had my gas cap a little loose on my other car and it was throwing CEL, VSC off, trac off. This is really stupid IMO - a loose gas cap turning off traction and stability control during the snow storm. At least I figured it out quickly enough.
This thread makes me NOT want to get a tune on my Turbo S. Maybe I'll just keep it stock. |
Originally Posted by Slate997TT
(Post 4003106)
I bet is the battery, when was the last time it was replaced ?
Nope, I put in a new battery when it strated doing this and it had a Porsche batt put in back in Aug.. Again, IMO, it's not the tune. Maybe a bad ground somewhere or a bad PSM module. I have been reading through some service manuals and am wondering if the tedh is following proceedure for isolating the problem. Still looking for the module the clutch switch talks to. Both the brake sw and ABS talk to the PSM module and those are the fail warnings I'm getting along with brake lights inop. |
Update. And this is a weird one, problem ended up being caused by a set of
aftermarket driving/fog lights, they were wired incorrectly into "15" power and shorting inside the lights causing the CAN bus to show a short and no "15" power signal being available to start the car. They unplugged the lights and no more problem. It only took 2 months and numerous hours of trouble shooting plus 3 techs working on it. The lights are mounted under the factory front parking lights so with one guy working on it were hard to see, when another guy was standing in front while one was working the ignition he saw the lights doing weird things and found the problem. So, no issues with any of the performance mods just a bad install of driving/ fog lights.:eek: Get the car back this week and have to have the DME re-flashed as they flashed it to stock for all the diagnostic work. |
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