Gear selection problem with a class

crompo

New Member
Joined
Aug 29, 2009
Messages
6
Reaction score
0
I have been told by local garage that my wifes 1999 aclass is in a non repearable state as a power surge caused by jump starting it off a jag blew the super fuses and also the ecu that is situated in gear box as it is a semi auto 1.4. Can anybody advise on this please?????
 

star

Forum Supporter
Authorised Forum Supporter
Joined
Oct 6, 2004
Messages
5,875
Reaction score
1,324
Location
Reading
Your Mercedes
Smart + others :)
Is it a clutcless manual or an auto with tip as the ecu is not situated in the gearbox in a clutchless manual, the box is the same as a manual but its got a automatic clutch system located in the n/s wing. if an auto box, the tcu is in the sump.
 
Last edited:
OP
C

crompo

New Member
Joined
Aug 29, 2009
Messages
6
Reaction score
0
  • Thread Starter
  • Thread starter
  • #3
Thanks for that, he is looking into it tomorrow. He said i should buy a new ecu for the car and hopefully this will resolve the problem. Fuses (inc super fuses) were blown in a power surge when the aclass was jump started by a Jag. This didn't start it so the AA put a booster charger on it which powered the lights but would,nt start the engine. In the end the AA man shorted direct to altenater which started the engine but the car would not engage into gear!. The garage suggested i buy an ecu and hope this resolves the problem but he can't gaurentee it will! Can you advise me on where to purchase as ecu and at what cost would i expect to pay.
Many thanks
 

Alex Crow

Senior Member
Joined
Jul 9, 2009
Messages
10,677
Reaction score
40
Location
Super Suffolk
Your Mercedes
W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
if you could answer star's question mr crompo, or tell us your vin number (in the windscreen) we need to know more about your car to comment.

what provenance does the garage that advised the ecu have? they really need to be an MB specialist with the correct diagnostic equipment to comment.
 
OP
C

crompo

New Member
Joined
Aug 29, 2009
Messages
6
Reaction score
0
  • Thread Starter
  • Thread starter
  • #5
Sorry yes it is a semi-auto (clutchless manual) i will have to pop by the garage tomorrow for vin No. He is a local general garage who I have taken my cars to for years, he did say that a couple of specialist he has spoken to didn't want to know!!! (I am based in Leeds)
 
OP
C

crompo

New Member
Joined
Aug 29, 2009
Messages
6
Reaction score
0
  • Thread Starter
  • Thread starter
  • #6
Just got vin # from documents!! WDB1680312J161666
 

Alex Crow

Senior Member
Joined
Jul 9, 2009
Messages
10,677
Reaction score
40
Location
Super Suffolk
Your Mercedes
W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
right, your gearbox just has a couple of sensors on to see the shifting of gears - no ecu there at all.

the clutch unit is mounted in the n/s wheel arch and, i believe, has the control unit built in. they can stop working and need re-adapting. equally other faults can stop them working or they do fail, and yes possibly due to that jump start.

here is a picture. http://www.detali.ru/cat/oem_mb2.as...6503&VIN=*&CT=F&cat=66A&SID=29&SGR=030&SGN=02

can you confirm it starts ok (with good battery), it goes into gear ok (gear lever feels like normal), but does not move when you rev it? and are there any other new faults you are aware of?
 
Last edited:
OP
C

crompo

New Member
Joined
Aug 29, 2009
Messages
6
Reaction score
0
  • Thread Starter
  • Thread starter
  • #8
Hi there, yes it starts ok with good battery but the gear lever will not move into gear position.
 

star

Forum Supporter
Authorised Forum Supporter
Joined
Oct 6, 2004
Messages
5,875
Reaction score
1,324
Location
Reading
Your Mercedes
Smart + others :)
I would think carefully if your garage tells you that the ecu is in the gearbox, as the control/operating unit is under n/s wing. you really need to have the faults read.
 

Autofix

Active Senior Members
Joined
Feb 18, 2008
Messages
97
Reaction score
0
Location
Coin, malaga, Spain
Website
www.kaneautomotive.net
Your Mercedes
SL600
There is no way they tested power supplies and grounds to the ECU before condeming it, since they dont know where the ECU is. It needs more looking at before a decision is made to spend money on a control unit.
 
OP
C

crompo

New Member
Joined
Aug 29, 2009
Messages
6
Reaction score
0
  • Thread Starter
  • Thread starter
  • #12
Thanks for the tips, i took it to a mercedes dealer today to have diagnostic check etc fingers crossed it can be resolved. Will post results.
 

Avantgarde Automotive, Mercedes-Benz and SLR McLaren specialists. Service, repairs, diagnosis and motorsport preparation.
Unit 14 Hither Green Trading Estate, Clevedon, Somerset, BS21 6XU Tel: 01275 217270 Email:steve@avantgarde-automotive.co.uk
www.avantgarde-automotive.co.uk
Top Bottom