Help. Bad Ecu?
Thread Starter
Newbie
Joined: Apr 2015
Posts: 13
Likes: 0
From: Fargo, ND
CLS55 AMG
Help. Bad Ecu?
Hey Guys,
New Here. Lots of great advice so hoping someone has ideas before I start throwing money at it..
picked up our 2nd 06 cls55 AMG. 58k, Rode/Drove Perfect.. did have a misfire every once in awhile.. (tune up like)
Ordered the stage 2 kit from eurocharged and took it to the shop.
Pulling into the shop and up the hoist ran great..
On hoist, installed new ngk plugs 1 degree cooler, new wires. Oil change.
Headers. Cat deletes. Needed to go the the exhaust shop to have exhaust flanges welded together.. was towed there.
shop called, went to pick it up and drive it the 4 blocks back to the shop.
upon start up it had a prevalent mis. Cel illuminated also.
computer revealed cyl. 2 injector malfunction. and no reading from bank 1 sensor 1 o2.
ordered new injector and o2 from dealer. Installed both.
Same codes
Tested wires at injector showed 12v. with no pulse from ecu..
did a continuity test from ecu to injector all is well..
did an ecu hard reset.. unplugged 2 hours plugged back in..
Now -
No more o2 code.
Still has injector malfunction cyl 2 and also p0300 and p0306
any ideas? Ecu? Reflash? called dealer and they said to try a re-flash for 150 bucks, but don't know if it will work or not.. no refunds if it doesn't..
__________________________________________________ ________
If ECU, is it only the amg ecu that will work in the car? or will a standard non amg ecu from a 55 work?
Thanks for the help in advance.. The AMG is the only car we have ever missed and bought another of.. Kicking myself for not listening to the wife who said not to do these mods!!!
New Here. Lots of great advice so hoping someone has ideas before I start throwing money at it..
picked up our 2nd 06 cls55 AMG. 58k, Rode/Drove Perfect.. did have a misfire every once in awhile.. (tune up like)
Ordered the stage 2 kit from eurocharged and took it to the shop.
Pulling into the shop and up the hoist ran great..
On hoist, installed new ngk plugs 1 degree cooler, new wires. Oil change.
Headers. Cat deletes. Needed to go the the exhaust shop to have exhaust flanges welded together.. was towed there.
shop called, went to pick it up and drive it the 4 blocks back to the shop.
upon start up it had a prevalent mis. Cel illuminated also.
computer revealed cyl. 2 injector malfunction. and no reading from bank 1 sensor 1 o2.
ordered new injector and o2 from dealer. Installed both.
Same codes
Tested wires at injector showed 12v. with no pulse from ecu..
did a continuity test from ecu to injector all is well..
did an ecu hard reset.. unplugged 2 hours plugged back in..
Now -
No more o2 code.
Still has injector malfunction cyl 2 and also p0300 and p0306
any ideas? Ecu? Reflash? called dealer and they said to try a re-flash for 150 bucks, but don't know if it will work or not.. no refunds if it doesn't..
__________________________________________________ ________
If ECU, is it only the amg ecu that will work in the car? or will a standard non amg ecu from a 55 work?
Thanks for the help in advance.. The AMG is the only car we have ever missed and bought another of.. Kicking myself for not listening to the wife who said not to do these mods!!!
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From: Houston
2003 W211 E55, 2003 W220 S600
did you disconnect the battery when installing all the parts? if not you probably shorted something out. When working on the headers you will get real close to the starter which is live.
Thread Starter
Newbie
Joined: Apr 2015
Posts: 13
Likes: 0
From: Fargo, ND
CLS55 AMG
I sure hope that's not the case.. The shop that did it I don't believe disconnected.. They guy working on it is extremely competent though.. they never mentioned that anything arched.. If that's the case it would be nice if they would say something to help alleviate troubleshooting..
Thread Starter
Newbie
Joined: Apr 2015
Posts: 13
Likes: 0
From: Fargo, ND
CLS55 AMG
Bump.
Question,
Anyone know what ecu's are cross compatible with cls55 amg?
I have been trying to find out, but can't get a solid answer.. my ecu number is rare..1131530791, & I believe as long as you re flash, 1131538679 out of a cls55 & cls500 would work..
Anyone have any input?
Thanks!
Question,
Anyone know what ecu's are cross compatible with cls55 amg?
I have been trying to find out, but can't get a solid answer.. my ecu number is rare..1131530791, & I believe as long as you re flash, 1131538679 out of a cls55 & cls500 would work..
Anyone have any input?
Thanks!
Senior Member
Joined: Jan 2007
Posts: 309
Likes: 6
From: Central Pennsylvania
1994 S420 RIP (2/8/13), 06 CLS55, 02 ML55, 94 TT Supra, 89 Maserati 228, 911 Porsche Carerra
What makes you think it's the ecu? Most dealers and the wis don't recommend re flashing the ecu. While I always remove the battery terminal (old days mechanic) it is done now primarily to stop potential surges from damaging the programming in the ecu. And before you start throwing money know there is no non AMG 55 ecu.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0306 code, for example, would tell you cylinder number six is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. In your case it is cylinder six.
A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages, Faulty camshaft position sensor, Defective computer
Note that the last item on the check list is the ecu. There is a reason because they normally don't go bad. You had an erratic mis when you got the car. I'd suggest you rule out all of the above before you decide it's the ecu that is unless you have boatloads of money you can afford to throw at the car until you "hit" the problem. Good luck
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0306 code, for example, would tell you cylinder number six is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. In your case it is cylinder six.
A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages, Faulty camshaft position sensor, Defective computer
Note that the last item on the check list is the ecu. There is a reason because they normally don't go bad. You had an erratic mis when you got the car. I'd suggest you rule out all of the above before you decide it's the ecu that is unless you have boatloads of money you can afford to throw at the car until you "hit" the problem. Good luck
Thread Starter
Newbie
Joined: Apr 2015
Posts: 13
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From: Fargo, ND
CLS55 AMG
So, no pulse from the ecu to injector 2 can be a bad o2, no cats on the car, or one of the many other things you stated? Never heard of that before. My concern is not the cyl. 6 miss, it's the no pulse from the ecu to the injector that has me thinking it's the ecu.. not the cyl 6 miss...
So your saying any e55 ecu will interchange?
Thanks for the input!
So your saying any e55 ecu will interchange?
Thanks for the input!
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Senior Member
Joined: Jan 2007
Posts: 309
Likes: 6
From: Central Pennsylvania
1994 S420 RIP (2/8/13), 06 CLS55, 02 ML55, 94 TT Supra, 89 Maserati 228, 911 Porsche Carerra
Did you check the connection at the other end of the ecu to verify that the plug into the ecu is fully set and snug? The fact that you are showing a cylinder 6 mis and no ecu pulse to injector 2 suggests that there may be a connection or harness break. Go to the source (ecu) and check the connection with the vehicle running so the pulse or lack of pulse would be present. As for interchange with an e55 one must look to the numbers on the current ecu and the e55. If they are the same fine if not don't do it as you will only compound and make more difficult the diagnosis. You need to rule out harness issues. Good luck.
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Thread Starter
Newbie
Joined: Apr 2015
Posts: 13
Likes: 0
From: Fargo, ND
CLS55 AMG
Thanks!
I Have today finally made some progress..
Found a place here in the us that works on ecu's that has a we fix it or your money back policy, and also found that the 1131538779 ecu number is a later model and fully interchangeable ecu with the cls55 amg.. ! amazing how no one had this information.. found it by accident on amazon of all places. Called the dealership to verify and they affirmed what I already knew.. they interchange.. the 8779 ecu is the "new" or replacement ecu for the old number..
So, we pulled the ecu overnighted it to the company and are keeping our fingers crossed.. weather is finally nice here in fargo nd and can't wait to get the car out with these new mods..
I will keep you all informed as to what the outcome was..
I Have today finally made some progress..
Found a place here in the us that works on ecu's that has a we fix it or your money back policy, and also found that the 1131538779 ecu number is a later model and fully interchangeable ecu with the cls55 amg.. ! amazing how no one had this information.. found it by accident on amazon of all places. Called the dealership to verify and they affirmed what I already knew.. they interchange.. the 8779 ecu is the "new" or replacement ecu for the old number..
So, we pulled the ecu overnighted it to the company and are keeping our fingers crossed.. weather is finally nice here in fargo nd and can't wait to get the car out with these new mods..
I will keep you all informed as to what the outcome was..
Senior Member
Joined: Jan 2007
Posts: 309
Likes: 6
From: Central Pennsylvania
1994 S420 RIP (2/8/13), 06 CLS55, 02 ML55, 94 TT Supra, 89 Maserati 228, 911 Porsche Carerra
I guess I didn't understand that you were talking about interchanging one cls55 ecu for another cls55 ecu. As long as they are the same year there should be no issues at all.
Thread Starter
Newbie
Joined: Apr 2015
Posts: 13
Likes: 0
From: Fargo, ND
CLS55 AMG
Its not.. its the ecu from the g55 amg..
they only made the cls55amg 1 year... so if you look for that part number the 1131530719 you can't find any due to it being so limited..
but the 1131538779 is an interchangeable ecu.. (again being from the g55amg)
they only made the cls55amg 1 year... so if you look for that part number the 1131530719 you can't find any due to it being so limited..
but the 1131538779 is an interchangeable ecu.. (again being from the g55amg)
