- Joined
- Dec 1, 2008
- Messages
- 13,702
- Reaction score
- 951
- Age
- 54
- Location
- Southampton
- Website
- www.mbssouthampton.co.uk
- Your Mercedes
- 124 300 CE 24 Coupe, C220CDI, Porsche 911 4s, Dolomite sprint,
- Moderator
- #1
Ok guys and girls. Not looking for answers hear as I have now traced fault!
Mate of mine asked me to have a look at he’s A170CDI, fault he reported to me was the ABS/ESP lights on! Ok I thought, new brake light switch needed!! God, I wish!!!
Short test showed the fault below!
Ok I thought, that will need a new ABS pump on it!
Wrong again! I found a 2nd hand pump online, ordered it and it arrived with-in a couple of days! Braved the ice cold temp and fitted the new pump. Quick bleed out, short test, same fault code! Now I was really ****ed off!
Left it for a couple of days due to work,
Day off, ok I thought, time to sort this A class! Printed out all seven sheets of wiring diagrams and stuck them together. Then come the time consuming task of testing continuity between the ABS plug to the ESP control unit!
This failed to show any faults with-in the wiring between the two units!
Now I started to doubt that I was going to trace this ****** fault!
Then I thought to my-self about the wiring again! If I was testing continuity between the plugs, but if the wiring had rubbed though to earth, I would be seeing a good reading on both sides, so back out with the muti-meter again, tested each wire again but to earth, then the same to positive, just in case!
Wiring again, checked out!
Ok, so now I was thinking that the control module for the ESP must have a fault with-in. quick phone call, £900 pound for a new one and no return!
Then I remembered that a good friend of mine (also a forum member) other half owned the same model!
Quick phone call, yes bring it down and try it! So today, after 3 weeks, I took it down and plugged it in to there car, guess what, ESP/ABS lights come on, short test, same fault codes!
After spending what feels like a lifetime working on the thing, I know what the fault is, ESP control unit!!
Guess the point of this post is, I thought I was good with these cars and knew more than my fair share about them! But sometimes we can look too closely into something and miss the obvious!
Just to add, i spoke with 6 differnt merc dealers who had never seen this fault code before!
Thanks for a lovely Sunday lunch Steve!
Mate of mine asked me to have a look at he’s A170CDI, fault he reported to me was the ABS/ESP lights on! Ok I thought, new brake light switch needed!! God, I wish!!!
Short test showed the fault below!
Ok I thought, that will need a new ABS pump on it!
Wrong again! I found a 2nd hand pump online, ordered it and it arrived with-in a couple of days! Braved the ice cold temp and fitted the new pump. Quick bleed out, short test, same fault code! Now I was really ****ed off!
Left it for a couple of days due to work,
Day off, ok I thought, time to sort this A class! Printed out all seven sheets of wiring diagrams and stuck them together. Then come the time consuming task of testing continuity between the ABS plug to the ESP control unit!
This failed to show any faults with-in the wiring between the two units!
Now I started to doubt that I was going to trace this ****** fault!
Then I thought to my-self about the wiring again! If I was testing continuity between the plugs, but if the wiring had rubbed though to earth, I would be seeing a good reading on both sides, so back out with the muti-meter again, tested each wire again but to earth, then the same to positive, just in case!
Wiring again, checked out!
Ok, so now I was thinking that the control module for the ESP must have a fault with-in. quick phone call, £900 pound for a new one and no return!
Then I remembered that a good friend of mine (also a forum member) other half owned the same model!
Quick phone call, yes bring it down and try it! So today, after 3 weeks, I took it down and plugged it in to there car, guess what, ESP/ABS lights come on, short test, same fault codes!
After spending what feels like a lifetime working on the thing, I know what the fault is, ESP control unit!!
Guess the point of this post is, I thought I was good with these cars and knew more than my fair share about them! But sometimes we can look too closely into something and miss the obvious!
Just to add, i spoke with 6 differnt merc dealers who had never seen this fault code before!
Thanks for a lovely Sunday lunch Steve!
