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97 E420 Transmission/ TCM?
6 months ago my indy replaced my trans with a MB rebuilt one. It was shifting hard which got better after driving more. After a couple of months, the trans failed and under warranty, he replaced it with another MB rebuilt trans. I though it was odd that a MB rebuilt would fail so soon, don't they test these trans out before they resell them? The 2nd trans was smoother than the 1st but 4 months latter it also fail (wouldn't shift from 2nd gear). I limped it over to me indy today, under the one year warranty and he mentioned that last time, MB said previously that the ECM (engine control module) may be causing the transmission to fail. Huh, is this possible? I am bracing myself for $$ repairs if it's the ECM. He's been my trustworthy indy for 5 years.
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) Last edited by edge; 09-09-2008 at 07:52 PM. |
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I am by no means an expert in this, but I did help a friend with the same sort of problem, and I learned quite a bit.
The electronic transmission is really dumb. It won't do anything without a command from the ETM. The ETM looks at a bunch of things before it will issue a shift command: speed, engine RPM, throttle position, engine load, phase of the moon, etc. In my friend's case the problem was the vehicle speed sensor (right front wheel) had failed , and was telling the ETM that the car was not moving, so (of course) there would be no command to shift. This will, apparently, not generate a fault code in the ETM. So my point is that it may not be the trans or the ETM, but one of the inputs that the ETM needs. If your indie doesn't know about this stuff, you need to take the car to a shop that does.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#3
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Thanks for your input but the check engine light is on and generating a fault code.
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) |
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Well, thanks for that bit of information.
Remember the engine control and transmission control are separate modules. I don't think you will get a CEL from the ETM, those codes come from the ECM and they are emissions-related. But the CEL may well be a problem related to the ETM's unwillingness to shift out of first gear.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#5
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Quote:
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) |
#6
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The ETM is my term for the "electronic transmission module," which is officially the "Transmission Control Module" (TCM).
I'm puzzled as to how oil would get into the ECM on a 140, but it sounds like it screwed things up enough to put the car in limp mode and stop the trans from shifting. You might ask your guy if he pulled the codes from the transmission, and if so, what were they. If he didn't do this, I would take the car somewhere that has the right test equipment.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#7
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This was a common problem on early 722.6's where fluid wicked up the harness and fried the ECM. Seal was redesigned a couple of times in 97/98 model years.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
#8
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My indy says the there were no fault codes on the trans. The fault code generated was that the ECM was having trouble communicating with the trans. He cleaned the contact and replaced the O ring. I drove the car and it seems fine. The shifts are a bit harsh but he said that the adaptive computer will make adjustments and smooth it out as I drive it more. He thinks the trans is good because there were not fault codes generated on it specifically. He wants me to drive it for a few days aand call him if there are any problems. He is insure whether the ECM is going bad. He is not charging me as the rebuilt trans comes with a one year warranty.
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) |
#9
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The trans control unit should have been replaced with the first repair as a 97 had the early VB and the rebuilt if done after 98 or 99 would have the new VB and require the new controller. The controller should be adapted by the tech installing it after being sure the previous adaptations are cleared.
Did your tech evaluate the adaptation data? If not why not?
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
#10
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Quote:
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) |
#11
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VB=Valve Body
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
#12
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Well I had to take my 97 E420 back to my indy to get the TCM clean out. Apparently it is oil fouled like it was last June. What is wrong with these Mercedes Benz transmission designs? Does this mean I have to periodically have the TCM cleaned out evry 3 months or so. WTF? He only charged me $40 and he said he spent an hour cleaning it out but what a PITA! Where is this TCM located, can I do this myself?
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) Last edited by edge; 09-09-2008 at 07:57 PM. |
#13
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Fairly rare problem and the only way it happens twice in the same car is that the issue wasn't resolved the first time. If you don't fix the problem you will do it again next year.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
#14
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There is an updated plug and seal set that need to be installed at the transmission end of the wiring harness. This (appears to have) fixed the problem on my S500.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#15
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How is it fixed, he replaces the O ring and it eventually seeps in again. What to do?
__________________
85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) |
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