Can anyone recommend a company that can carry out checks and repairs to engine control units? An eletrical fault on my clk 55 amg has been diagnosed as an ecu fault, but at £1186 + vat for a replacement I would like to try the repair route if possible, any info would be appreciated
Navigation
Install the app
How to install the app on iOS
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
More options
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
andymerc
Active Member
Try Aviatec give them a call on 01983 281811
andymerc
Active Member
used them 3/4 times with no problems
alexander patie
Active Member
hello rjj73 - odd name, is it slovak?
can you tell us what your car's SYMPTOMS are, and what tests have been done and what fault codes found. there may be other possibilities.
also what year is your car, and can we have the first six numbers of the vin if possible.
can you tell us what your car's SYMPTOMS are, and what tests have been done and what fault codes found. there may be other possibilities.
also what year is your car, and can we have the first six numbers of the vin if possible.
alexander patie
Active Member
i have had a read of your problems. i don't know off the top of my head the function chain for your fan, but suspect it goes through the front sam as the other chap suggested.
an ecu repairer and tester is generally looking at output stages for blown semi-conductors etc, and would probably struggle to find this fault on a bench test. i am sure it could be pinned down with star though. eg does ME live data show that the ecu is calling for the fan? does the front sam know it is running the fan? have all the stored codes been assesed with a short test (especially the sam)?
if i get time i will check out the function chain tomorrow and get back with a summary, those vin numbers will help.
an ecu repairer and tester is generally looking at output stages for blown semi-conductors etc, and would probably struggle to find this fault on a bench test. i am sure it could be pinned down with star though. eg does ME live data show that the ecu is calling for the fan? does the front sam know it is running the fan? have all the stored codes been assesed with a short test (especially the sam)?
if i get time i will check out the function chain tomorrow and get back with a summary, those vin numbers will help.
Hi Alexander,
no we arnt Slovak, just born and bred Lancashire!!!!! Thanks for your help, the first six are WDB209476, we have had the car on the MB Star with an auto spark who is well up to speed with using the program. He basically spent yesterday running tests on the vehicle, checking the wiring with an oscilloscope, the sam and that loom for shorts. The fan module is definitely fine we are 99.9% sure of this, but the ECU is firing out a constant 12volts all the time to the suction fan, I am not sure of the equipment he used but when placed on the blue/green wire from the ecu to fan he was able to control the fan speed which points to the problem being in the ecu. Under his own admission he has never had a problem with a 209 Merc ecu giving a fault like this! Everyone seems a bit foxed by this car, we are a bodyshop and have a reasonable understanding of the electrical system, but have gone with experts as we know our limitations! this is my own personal car so obviously we are trying everything!!
no we arnt Slovak, just born and bred Lancashire!!!!! Thanks for your help, the first six are WDB209476, we have had the car on the MB Star with an auto spark who is well up to speed with using the program. He basically spent yesterday running tests on the vehicle, checking the wiring with an oscilloscope, the sam and that loom for shorts. The fan module is definitely fine we are 99.9% sure of this, but the ECU is firing out a constant 12volts all the time to the suction fan, I am not sure of the equipment he used but when placed on the blue/green wire from the ecu to fan he was able to control the fan speed which points to the problem being in the ecu. Under his own admission he has never had a problem with a 209 Merc ecu giving a fault like this! Everyone seems a bit foxed by this car, we are a bodyshop and have a reasonable understanding of the electrical system, but have gone with experts as we know our limitations! this is my own personal car so obviously we are trying everything!!
alexander patie
Active Member
hello mr hotpot lover, guess it's hard coming from lancashire with those taller, cleverer more handsome yorkshire lads next door.
sounds like your electrics fellow knows his stuff then. here is what i have found out.
the fan module has four wires, the two 10mm2 red and brown are obviously permanent live and earth and deal with the current.
the other two are 0.75mm 'signal' wires. the black/white wire is live with circuit 15, supplied by the front sam - fuse 51 i think (7.5a). this should be live with ignition on.
this leads to the interesting one, the green/blue wire which is 0.75mm2 and wired to the ecu. on some versions, including yours i think, it is in series with a 10 ohm resistor wired into the loom at connector z5/1 - pins 1+2. i would expect this to be buried in the loom between fan and ecu somewhere, and not obviously accesible. this is used with the 850w fan, as opposed to the 550w fan.
i suggest you do two things.
1. disconnect the fan plug and the relevent ecu plug and test the green/blue wire for continuity, if it reads 10ohms or 0 ohms you should be ok - as i said it depends which fan you have, see above.
2. remove the green/blue wire from the ecu plug and then retest the voltage in it when the fan is connected and the ignition on, is it still +12v?? this may show that actually the ecu provides different reference resistances (voltage coding) to control the fan speed.
possibly your electrician has already done the above and more, certainly with the star at his disposal he should have checked to see if the ecu is showing that it is running the fan in the live data. if it is, then it could still be a climate control issue!!! for this reason the climate control live data should probably have been checked as well.
good luck!!
sounds like your electrics fellow knows his stuff then. here is what i have found out.
the fan module has four wires, the two 10mm2 red and brown are obviously permanent live and earth and deal with the current.
the other two are 0.75mm 'signal' wires. the black/white wire is live with circuit 15, supplied by the front sam - fuse 51 i think (7.5a). this should be live with ignition on.
this leads to the interesting one, the green/blue wire which is 0.75mm2 and wired to the ecu. on some versions, including yours i think, it is in series with a 10 ohm resistor wired into the loom at connector z5/1 - pins 1+2. i would expect this to be buried in the loom between fan and ecu somewhere, and not obviously accesible. this is used with the 850w fan, as opposed to the 550w fan.
i suggest you do two things.
1. disconnect the fan plug and the relevent ecu plug and test the green/blue wire for continuity, if it reads 10ohms or 0 ohms you should be ok - as i said it depends which fan you have, see above.
2. remove the green/blue wire from the ecu plug and then retest the voltage in it when the fan is connected and the ignition on, is it still +12v?? this may show that actually the ecu provides different reference resistances (voltage coding) to control the fan speed.
possibly your electrician has already done the above and more, certainly with the star at his disposal he should have checked to see if the ecu is showing that it is running the fan in the live data. if it is, then it could still be a climate control issue!!! for this reason the climate control live data should probably have been checked as well.
good luck!!
never really seen a handsome Yorkshire lad, they are usually down some mine somewhere arnt they????? seriously though thanks for your time, the points that you have made are correct and we have carried out the tests previously. I have taken the plunge and sent the ECU for inspection, ill let you know how we get on. I may end up putting a toggle switch in the middle of my dash, that will sort it !!!!!!
alexander patie
Active Member
what was the resistance on the green/blue wire then?
was the ecu calling for the fan? did the fan run with the wire removed from the ecu plug? was the aircon module calling for the fan?
good luck with getting the ecu tested, have you spoken to the tester yet? does it sound like something they can test?? (this is doubt)
also can you list any other symptoms that may be related? i like a challenge!!!
was the ecu calling for the fan? did the fan run with the wire removed from the ecu plug? was the aircon module calling for the fan?
good luck with getting the ecu tested, have you spoken to the tester yet? does it sound like something they can test?? (this is doubt)
also can you list any other symptoms that may be related? i like a challenge!!!
as soon as the tester gets back to me ill let you know what they say, im sceptical whether they will be able to test for this fault as well!!! The car is showing no other faults, everything else is working fine, the only thing i can say is that the fault appeared to happen after my partner held the ignition key on with the car already running, she had already started the car but got distracted by the kids so tried to restart the car, I asked if she had just flicked the key but she told me she had held it on!!!!!! I dont know whether this could be related but you would expect the system to be protected?
alexander patie
Active Member
i don't think the starter would engage on yours, it is far too clever for that, but i have never tried it myself!!!
keep us posted.
keep us posted.
HHHCLK55AMG
New Member
- Joined
- Feb 10, 2008
- Messages
- 13
Guys, did you mange o sort his one out, i have exactly the same problem, any reply to [email protected] would be much appreciated.
Ive actual changed out the ecu but the problem came back after 1 week
Ive actual changed out the ecu but the problem came back after 1 week
Users who are viewing this thread
Total: 2 (members: 0, guests: 2)
