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  #121  
Old 07-11-2018, 03:07 PM
J-Mech J-Mech is offline
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I agree with Jon. Call them whatever you like, they're both NTC thermistors. Gauge is under the left exhaust manifold and PCM is by the thermostat housing, IIRC?
That's correct.
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  #122  
Old 07-11-2018, 03:11 PM
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Low line pressure code should disable TCC.
I agree.... but, I don't see a drop in line pressure at any point. Seems to stay up there. Target matches actual. I don't see a drop when the TCC is in transition, or while it's applied. This thing uses all PWM solenoids. Unfortunately, you have to have a test pan, as the pressure taps are on the valve body.... and I don't have one. I *think* I've got a bad TCC solenoid. But, these valve bodies are known to have leak issues on the line pressure circuit..... may just need a valve body. Not sure yet....
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  #123  
Old 07-11-2018, 03:32 PM
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Shrewcub Shrewcub is offline
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I don't think I have had the pleasure, but I have replaced the sensor module/plate( also has all the wiring to the solenoids) that goes above the valve body on some of the German Chrysler transmissions (also used on Mercedes ). Who makes that trans?
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  #124  
Old 07-11-2018, 03:41 PM
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I don't think I have had the pleasure, but I have replaced the sensor module/plate( also has all the wiring to the solenoids) that goes above the valve body on some of the German Chrysler transmissions (also used on Mercedes ). Who makes that trans?
68RFE is a 6 speed Dodge (Chrysler). Looks just like a 48, but bigger and more electronics. This is the first one I've worked on, so I'm in unfamiliar territory.
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  #125  
Old 07-13-2018, 09:11 PM
V30crewcab V30crewcab is offline
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definitely has two different temp sensors on a 91 chevy.
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  #126  
Old 07-13-2018, 09:41 PM
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definitely has two different temp sensors on a 91 chevy.
Of course there is... sort of lol. If you call your parts house and ask for a temp sender you will get one part, "the one that controls the gauge" if you ask for the coolant temp sensor you will get the other. "The one that communicates with pcm to adjust timing and fuel injection"
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  #127  
Old 07-13-2018, 09:52 PM
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No "sort of" about it. There is a temp sensor for the PCM, and a separate sender for the gauge.

I checked the temp via the PCM, by the way. It was fine. Did not match the gauge. Incidentally, today I noticed the volt gauge was also reading high. Checked that against a DVOM. That gauge too is off/high. Thinking I may have a ground issue for the gauge cluster.

Think I found the issue with the Dodge tranny as well..... it was a real
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  #128  
Old 07-14-2018, 06:43 AM
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I always hated the 90's GM clusters. Always added aftermarket mechanical temp ,oil pressure, and battery. Just felt like I could never trust the stock ones for some reason

What was up with the Dodge?
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  #129  
Old 07-14-2018, 07:05 AM
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No "sort of" about it. There is a temp sensor for the PCM, and a separate sender for the gauge.

I checked the temp via the PCM, by the way. It was fine. Did not match the gauge. Incidentally, today I noticed the volt gauge was also reading high. Checked that against a DVOM. That gauge too is off/high. Thinking I may have a ground issue for the gauge cluster.

Think I found the issue with the Dodge tranny as well..... it was a real
I said sort of because V30 said there are 2 "sensors" I was just pointing out the reason why one should be called a sender and the other should be called a sensor. In 91 they are both pretty basic devices but was pointing out if you called parts store for a replacement and call out the sender, you will get the sender not the sensor. The debate happened earlier on in this convo when you assumed I didn't know the difference. Anyway.. No big deal. I know you "Jon" know the difference and have no doubt you know exactly how to test both.
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  #130  
Old 07-14-2018, 08:00 AM
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I always hated the 90's GM clusters. Always added aftermarket mechanical temp ,oil pressure, and battery. Just felt like I could never trust the stock ones for some reason

What was up with the Dodge?
GM is pretty dominant in my area. In the early 2000's, almost always had a Chevy in the shop for one reason or snother. Never had gauge issues. Now, the 2000'S GM's, those have gauge issues. Not the 90'S trucks.

Believe the Dodge trans may have a blown ring on the stator shaft. Took the valve body out and checked all the electronics. They checked out fine. Only 2 valves in the valve body, along with 5 accumulator pistons. Everything was good. Electronic options have been thoroughly checked, has to be an internal leak.
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