posting this question here in this forum, because perhaps it will get more hits and replies here, being it's a W140 car, new to forum this is my 2nd post:
recently rescued an ailing 1994 S600 coupe with V12. complete car except for owners manual, right side distributor cover, and battery. no fuel pressure, but it would start and run on ether starting fluid. towed to friends garage. changed both fuel pumps, filter, battery, hit key varoom it started right up. front brake calipers were locked from sitting. changed those along with brake hoses and pads, fixed that too.
it will need rear brake lines, and the hydraulic lines in front left inner fenderwell.
I'm 57, been working on cars and as mechanic for 40 years now. built a ton of engines from bare block up, all American V8's, and a few V6's. body off restos, transmissions, rear axles, paint jobs, total suspension rebuilds, alignments, exhaust, interior, glass, you name it. built cars from bare frame up since I was in my 20's.
but I never owned a Mercedes, or worked on them much. there was an old '73 V8 OHC 4 door at the lot I worked at, in 1984. it always intrigued me, should have bought it. it was only $1500 back then, and ran like a top, but was getting rusty...
anyway, I'd like to get a handheld scanner for this '94. I have no intentions to reprogram any modules online, or use a laptop. IMHO, when it gets to the point you're connecting a laptop to your car, it's no longer a car. it's become an aircraft or space shuttle and too complex. want to keep it as simple as possible. I just want to see datastream info, isolate the bad sensor or part or wiring, and replace it, if need be.
as of now I don't even know if the sensors are working properly or communicating with the ECM's. I have an OBDII scanner, I can adapt it to the underhood 38 pin plug, but have been told my scanner will not recognize the language. haven't tried it yet, the adapter is on its way.
I do have access to the latest $15,000 Snap-On box black box scanner, but the shop does not have the Mercedes 38 pin cable adapter. we will try my adapter when it arrives (I've ordered it).. but I still want my own handheld scanner to use at home on the car, and keep in the trunk.
what vintage or new handheld scan tool, will display/erase codes, and give datastream information on the engine/transmission primarily ? if it did other modules too, great, but not a necessity. I'd disable any superfluous systems before I'd spent a lot of time diagnosing or repairing them. I just want to get it running good, and step on the V12, and have some fun. when you're banging on 60, time becomes a factor, cuz at that age, you're running out of time. any help from you guys would be great and really appreciated.
thanks much, looking forward to any and all replies, no matter how rudely awakening they may be....I'm expecting a "no" answer.
Back in the day, there were a few handheld tools, chief among them the Mercedes Handheld Tester (HHT). It was discontinued by Mercedes, and emulation software written for Windows, called HHTWin, replaced it. It is the portion of the software that is still used to diagnose W140s by Mercedes. It requires a laptop and a multiplexer unit. I've not seen an actual HHT for sale. There is one YouTube video I've seen of one in use. HHTWin is pretty much an exact duplicate of the old HHT.
There were also a couple of aftermarket handheld units sold that did W140s, but they are long out of production and very scarce. They were marketed by Tresco and Baum tools. I have one of the ones made by Tresco, and I looked for a couple of years before I found it. I bought it as I thought it might be more convenient to take on trips. It's adequate, but HHTWin is far better. Support for the old scanners is non-existent, and there is at least one late model function it doesn't cover. The one I have is handheld in name only, and is pretty big and bulky. A small laptop and multiplexer is easier to use, covers all functions, and really isn't much bigger. I take it with me in a small computer bag.
I don't know of any aftermarket scanner that covers all W140 functions, particularly early cars. Late W140s have OBDII, but only for the engine and emissions items. You can use a blink code reader, but that won't give you live readouts like HHTWin.
One last word, stay away from Carsoft. Multiple reports say it doesn't work at all.