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post #1 of 11 (permalink) Old 08-11-2012, 10:44 PM Thread Starter
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Exclamation Limp mode problems!!!!

Hi guys,
New here, but I read your posts a lot. Lots of good info here, but I can't find a solution to this problem yet. I've dealt with limp mode problems before on numerous Chrysler products but this one has me stumped. Current project is a 96 lhs. It's made it's rounds thru a few shops and no solutions yet. I messed with it for a few hours and I can get it out of limp mode sometimes and only for short periods. Here is what has been done so far:
Input and output sensors changed no difference
Shop supposedly replaced the shift solenoid pack, worked for a while
Shop checked and cleaned the pack again and said wasn't the problem.
Today I took out a quart and a half of fluid and got it to shift temporarily.
I pull the TCM relay and it works for a few miles then returns to limp mode.
The problem started after the rear brakes were changed. 2 days later got an abs light. 2 days after that I get limp mode. Engine runs smooth, ride is smooth, shift smooth when I can get it out of limp. Before it goes into limp, the traction off light comes on, the abs light comes on then 3 miles later, limp mode. I figure it's electrical but I can't find the connection. Please help! I love a challenge but this one is kicking my butt!
Can't remember the number, but the last code was a shift solenoid c.
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post #2 of 11 (permalink) Old 08-11-2012, 11:01 PM
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This sounds like a good candidate for diagnosis with a DRBIII, (Factory scan tool).

Does the speedo always register properly? Replacing the speed sensors is a good idea but, wiring issues can be diagnosed with live data on the trans. You might also try disabling the ABS module and see if it is affected.
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post #3 of 11 (permalink) Old 08-12-2012, 12:27 AM Thread Starter
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Speedo always smooth. Rpm gauge seems like it sticks compared to engine operation with is very smooth. How would I go about disabling the abs? I was tossing around the idea of a bad input sensor out of the box, but when I disconnected it, it threw an input sensor code so I figure that is working as well. Right now, I start the car and no lights are on. I drive a few feet and the abs and traction light off light up. Within 3 miles I'm in limp mode. The warmer the car is the sooner it jumps into limp mode.
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post #4 of 11 (permalink) Old 08-12-2012, 12:52 AM
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I'm too beat to dig out the manuals tonight. This car is in your shop now? or is this your own car?

I don't think I've seen this type of ABS/AT correlation but, something sticks in my mind about wiring damage and or perhaps the ABS and Trans controller are having issues communicating over the bus.

Could be something as simple as an ignition switch I guess but, you'd need some sort of scan tool to see what the codes are in both the ABS and TCM to help isolate the fault.
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post #5 of 11 (permalink) Old 08-12-2012, 09:08 AM Thread Starter
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Cars are my hobby. I got a reputation around here for finding stuff the shops can't. I love a challenge, but this is a real head scratcher. It's a buddies backup car and he is never going to let it go. His wife says he can keep it as long as we keep the fix cheap. I know the abs system and the gauge cluster is run by he body computer and I know it communicates with the tcm somehow for the traction control. Also I know the traction control and abs use the wheel sensors as inputs for the systems to work. As far as a scan tool, would a good OBDII work or is there something else out there that I need? Guess if I had a good wiring diagram I could start looking for a connection to the 2 issues.
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post #6 of 11 (permalink) Old 08-12-2012, 10:02 AM
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There are downloads available for the factory manuals 'round here. It should only take a moment's search to find one. The part that has me suspicious is the ABS / Trans connection. The transmission provides the output speed signal to the TCM and is bussed to the PCM, ABS etc. The TCM does not need info from the ABS to function properly. It does however need TPS, ECT from the PCM.

A scan tool would be highly beneficial in this saga. At least then you could figure out what code the trans is setting and go from there.
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post #7 of 11 (permalink) Old 08-12-2012, 10:19 AM Thread Starter
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The one code that keeps coming up is a code p0760 ( shift solinoid c). All other codes (input/ output codes, purge solinoid, and loss of bus signal to the tcm) were triggered after they were unplugged and the car started. Those codes were cleared so we could get a real code. P0760 came up again. I'm going to search around for the wiring diagram now. ECT? The engine coolant sensor? This ties in to the tcm somehow? Tps is ruled out do to smooth acceleration and no code.
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post #8 of 11 (permalink) Old 08-12-2012, 11:02 AM
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This fault code appears to be unrelated to the repairs done on the brakes. I'd start from scratch and start looking at the trans control wiring. Particularly the OD solenoid wiring, (Did you find a schematic)?
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post #9 of 11 (permalink) Old 08-12-2012, 12:21 PM
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me myself, would chase the wire loom from the trans up into the engine area, and ill bet you will find where they go into the main wire loom on the right side of the engine, your gonna find the problem, seems 94-97 had some problems with the connections on the main loom,, with the abs light popin on , then going into limp mode,, something is causing a short, bad ground etc,, worth a look
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post #10 of 11 (permalink) Old 08-12-2012, 12:58 PM Thread Starter
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Haven't found the schematic yet. Had one pinched wire on the tcm connector (white with red stripe) but it Ohmed out good. The thing is it works. For 3 miles it works. Then it goes limp. Shut the car off for 10 minutes restart and drive it 2 miles then limp. Eventually it will stay limp until the next mornIng when this whole process starts over. It's almost like the trans gets to a certain temp then goes limp. One time I was able to shift to neutral coast a quarter mile, shift back into drive and it popped out of limp and worked fine for another mile before it limped again. I know wiring shorts can be tricky to diagnosis but this becoming a repeatable pattern. It doesn't feel like a random short. I'm going to check for some more of the harder to see wires later anyway to rule them out. Also I read somewhere about a pressure sensor built into the shift solinoid? Could the trans being overfilled cause that specific component to go bad and cause this problem? Also, where exactly is this solinoid pack located? I'm assuming it is on top of the trans somewhere?
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post #11 of 11 (permalink) Old 08-12-2012, 03:01 PM
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Quote:
Originally Posted by DrDodge View Post
me myself, would chase the wire loom from the trans up into the engine area, and ill bet you will find where they go into the main wire loom on the right side of the engine, your gonna find the problem, seems 94-97 had some problems with the connections on the main loom,, with the abs light popin on , then going into limp mode,, something is causing a short, bad ground etc,, worth a look
Yes, I remember the recall involved a plastic channel be installed to prevent the wires from chafing.

Sort of like the wranglers that had so many issues with wires chafing around the back of the head where the bolt studs stick straight up.
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