Mercedes OM617 diesel to AW4 Cherokee automatic trans
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Mercedes OM617 diesel to AW4 Cherokee automatic trans
Just got an AW4 transmission to make OM617 Mercedes diesel conversion some guys have been asking for. Got bellhousing to engine adapter back from shop today. The crankshaft adapter is the same as one we made for the wrangler automatic. Here is a progress so far.
Hope to test fit to engine this weekend.
Hope to test fit to engine this weekend.
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Thats really the only two things it needs to determine when to shift - how fast the engine's turning and how much throttle you're giving it...
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Looking good! I'm glad to see progress on this! Keep it up! I look forward to hearing from you when mine's done! (First one of course!) Yes, this is Dean, the guy that called you monday and lit a fire under your...
As far as the transmission control, I can look up the wiring schematics on Mitchell On-Demand at work on monday. I told you about the little box with toggle switches I built for our Jeepspeed a few years ago, but talking with my wife, she prefers to maintain the fully automatic feature as well. So, I will be looking that up for my project anyway. Having manual control over the torque converter lock up may prove to be handy even with the TCM though...
As far as the transmission control, I can look up the wiring schematics on Mitchell On-Demand at work on monday. I told you about the little box with toggle switches I built for our Jeepspeed a few years ago, but talking with my wife, she prefers to maintain the fully automatic feature as well. So, I will be looking that up for my project anyway. Having manual control over the torque converter lock up may prove to be handy even with the TCM though...
Last edited by Throttle Jockey; 05-05-2012 at 01:15 AM.
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So I did some research this morning, to keep the TCM happy all we need to do is mount the TPS. The TCM does not receive any signal from the CPS. The TCM has it's own speed signal coming from the transmission's output shaft. We couldn't ask for that to be much easier.
IIRC the 90 and earlier (ReNix) system uses the CPS for tach signal, because they have no VSS - the speedo is a mechanical drive off the tail housing of the tranny. The 91-96 ((HO) uses the VSS on the tranny tail housing, and I'm not sure what the 97-01 models use, but unless I'm mistaken they don't have a separate TCU - its functions are incorporated into the main ECU.
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I looked it up for my '88. I can check the latter years tomorrow, I didn't even think to check them. There is an output shaft speed sensor in the aw4 specifically for the tcm. It has nothing to do with the speedometer. I didn't remember it was in there, if I were to have guessed I would have thought it needed the cps.
Last edited by Throttle Jockey; 05-07-2012 at 10:24 PM.