Here are the 2 codes I am still throwing in my 94 Auto Z28 LT1.

59 - Transmission Fluid Temp sensor circuit high - low temp

81 - QDM or shift B solenoid fault

The trans is new/rebuild and I spent the day replacing the shift solenoids and that still did not fix the problem of either of these codes.

Any ideas what else to check/replace for these codes?

Thanks!

 

What is your actual fluid temp, on a data scan? Is the "B" solenoid being commanded? What are the actual driving symptoms your having?
This sounds like a wiring or computer issue. The Quad Driver Module is a part of the computer.

Frank
CPT

 

Well thats the issue is I have a scanner but it isn't the type where I can read the sensors. I can just get codes. I figured I would replace the shift solenoids but still nothing. Same codes still.

As far as driving issues honestly I really do not feel any issues driving it. I know it is sluggish off the line but it also has a 2400 stall in it. I know ever so often at around 35-40mph cruising it will studder or feel like a miss so that could be the tranny but just figured it might be a tune up issue.

 

If you have replaced the PMS and the solenoid and still have the codes you may have a PCM or wirig issue

 

The Quad Driver Modules were only used through 1993. Beginning in 1994, they are no longer used. Use Shoebox's LT1-specific code list:

http://shbox.com/1/Dtcs.htm

There's a tab at the bottom of the page for tranny codes.

 

Oh ok,

So it still shows my 2-3 shift solenoid circuit and I replaced both solenoids so what else could be causing that problem? and the other code still shows to be the tranny fluid temp sensor circuit high ( low temp indicated).

Thanks for the heads up on the codes being different now I have to track down the problem. Seems that the only thing left is the wiring but not sure where to even begin there. I could still replace the pressure manifold sensor but would that effect either of the codes given?

I still can not track down my code 53 (system high voltage) which it seems to come and go sometimes as well. Maybe that could be causing an issue?

Thanks!

 

wiring or suttin in valve body hung up had it happen in a 95 k1500....

 

Yeah, I hate wiring but I do not see if being the tranny as it's new/rebuilt. I know it can happen but I have alot more wiring that had to be done on this car so that could be the issue.

Where do the tranny wires go from the plug on the tranny? I know they go up to the PCM but where do they go from there? Would the wires run through the C200 connecting wires?

Thanks

 

Shoebox has a complete harness assembly with labels on his website. Its for a 95, but its basically the same as your 94.

http://shbox.com/1/harness.htm

He also had the complete PCM wiring diagrams, which will be similar as well.

http://shbox.com/1/4th_gen_tech2.html#1995_pcm_wiring

 

Thanks.

I have looked at those 2 diagrams but I am wondering if the wires from the PCM then go through the c200 connector at any point and time. I had to rewire that entire connection and might have crossed the wires or such and have yet to find a diagram for that c200 connector under the dash in the drivers side kick panel.

I appreciate your help

 

Shoebox also has the harness connector pinouts, but I don't see one for C200. There is also a tab for the 4L60E connector, but the link to the pin diagram is dead.

http://shbox.com/1/harness_connector_faces.htm