W203 Battery Alternator visit workshop message

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W203 Battery Alternator visit workshop message

Postby victor2k » Sun Jul 17, 2016 1:58 pm

Hello,
I need some help to diagnose a Mercedes W203 what show on MFD "Battery Alternator Visit Workshop".
The charging voltage is 14,5-14,7v at idle,the wiring was checked between alternator and Front SAM.
No faults related to charging system was stored.
Regards.
victor2k
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Re: W203 Battery Alternator visit workshop message

Postby STC » Sun Jul 17, 2016 7:17 pm

Victor

No faults stored, thats unusual, what scanner are you using and where are you looking ??
Some history please, has this had an alternator fitted recently ?

Have Engine Earth and Alternator B+ been Volt Dropped, with alternator fully loaded ?

Could you probe the 2 small alternator wires from Ign off, ign on,cranking and idling then post the file.

thanks
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Re: W203 Battery Alternator visit workshop message

Postby victor2k » Sun Jul 17, 2016 7:26 pm

Hello,
I used Star but the readed faults isn't related to the charging...some bulbs and other stuffs .
The alternator wasn't changed,I checked the wires and no abnormal voltage drop on B+
On MB forum I read about the changing of alternator...what I can check before replace it?
Thank you.
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Re: W203 Battery Alternator visit workshop message

Postby STC » Sun Jul 17, 2016 8:55 pm

Using STAR I am surprised you dont have a faultcode - tied in with a Message on the Cluster - never seen that before.
Actual Values in Cluster ????

Have seen shorted / broken wires, wrong alternators, faulty regulators, SAM but always a fault code.

Are you doing a Short Test or just looking in one control unit ?

Scope the Peak to Peak and Current from the alternator get some additional clarity.
You can buy the Regulator Seperately.

What is Star Guided telling you to do and look for ???
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