Merc A140 auto clutch system

[smik]

Hi all I have a problem with a Merc A140
No start issue .. no crank but will start if you short the starter then the next issue is cant get it into gear.
I have checked the two power supplys and the ground and also the k line at the acs module all check out fine. This was the check list from DAS
The problem is I cannot communicate with this module using any scan tool ive tried a second hand module with the same result . In saying that I get coms with the other modules.
Anyone else had this problem or any guidence

[Ashraf6119]

Hi

Have you checked all the Earth wires if they are nice and clean

[smik]

All earth are fine conducted a voltage drop test ,, pins back to battery ...

[the_riddler]

All earth are fine conducted a voltage drop test ,, pins back to battery ...

This wont help you but......
we have in the yard the exact same fault even with all other modules removed still no comms with this unit.
we have tried everything we can think of, thats why its outside..

but we will drag it in at some point for another bash, but not yet..

i will update this if we find the fault, can you kindly do the same..

[autotrans]

It is common on A class transmission e c u's to lose comms, the K line will not even power up on the bench, just wondered if the auto clutch use the same sort of e c u

[the_riddler]

It is common on A class transmission e c u's to lose comms, the K line will not even power up on the bench, just wondered if the auto clutch use the same sort of e c u

The controler on the semi-auto, only controls the hydralic clutch system.
the car is basicly a manual, all gears selected manually, the pump (with cotroller) is just your clucth pedal.
All the systems in these cars seem very nasty..

[Shusun]

anyone found solution to this?