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#1
01-23-2007, 11:22 AM
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1992 500E - Transmission overload protection switch failure (or reaction valve / pin?
On my new toy, a 1992 500E (124-036) I’m getting a “code 8” on the “distributor ignition” computer, which translates into “transmission overload protection switch does not close”. I understand the function of this system (to retard engine timing during full throttle upshifts) but I am trying to diagnose the cause of the switch malfunction, as well as understand how the switch itself works.
A shop with a good history on MBZ transmissions apparently rebuilt the transmission two years ago; I don’t know if this problem is new, or if it has existed since the transmission was rebuilt – thus my concern whether it may be something internal vs. the switch itself. In the transmission diagrams, there is a pin and a “reaction valve” behind the switch - my concern is if either of these parts could be defective. My questions: Is the switch itself a common failure point? Can the switch be tested (and how)? Is the reaction valve or pin a possible failure point? Thanks in advance for your help…
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Current rolling stock: 2001 E55 183,000+ Newest member of the fleet. 2002 E320 83,000 - The "cream-puff"! 1992 500E 217,000+ 1995 E300D 412,000+ 1998 E300D 155,000+ 2001 E320 227,000+ 2001 E320 Wagon, 177,000+ Prior MBZ’s: 1952 220 Cab A 1966 300SE 1971 280SE 1973 350SLC (euro) 1980 450SLC 1980 450SLC (#2) 1978 450SLC 5.0 1984 300D ~243,000 & fondly remembered 1993 500E - sorely missed.  1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years. Last edited by RunningTooHot; 01-23-2007 at 11:36 AM. 
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