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#1
10-11-2006, 10:05 PM
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722.500 overdrive diagnosis question
in my 1990 300 sl w/a 722.5 automatic the 5th gear is not working. could someone tell me if there is a way i can determine if it is in the electronic control issue for the overdrive unit or an internal issue that would reqiuire a rebuilt tramsmission
thanks Last edited by ken garchow; 10-12-2006 at 02:59 AM. 
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#2
10-12-2006, 08:02 AM
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Computer controlled system..MB scanners should be able to generate code that would allow for correct diagnosis.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
10-14-2006, 11:36 AM
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thanks doc, is there any home remedy for this patient?
anything i can do say w/a test light and a power supply the see if the internal solinoid is working? i can pull the pan @ home also if that helps
not that i dont like shops, but doing it myself is part of the fun....
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#4
10-14-2006, 08:36 PM
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Check for fault codes, if not you are diagnosing a problem with you eyes closed.
If you have 5th gear at full throttle check for a disconnected vacuum line between the intake manifold and ignition control unit KZL/AKR.
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#5
10-15-2006, 11:32 PM
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thanks, ill have the codes puilled (nt)
nt
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