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Discussion Starter · #1 · (Edited)
Warning: If you're reading this, you're smarter than me. Internalize any of my observations/assumptions at the risk of becoming more stupid.

That said, I'm trying to figure out an aspect of the ecm without cracking it open. I rather prefer to understand what I'm doing rather than open a can of worms and not be able to button up my daily driver.

I'm trying to identify the "brown" wire cited in Heath's blog:

http://blog.heathdiesel.com/ Manual operation of the torque converter lock-up clutch in 1992-1995 trucks with the 4L80E.

A wiring diagram for the 1994 6.5L TD w/AT can be found at

http://arrc.epnet.com/autoapp/9102/chiltonimages/9102/91026E05.pdf

I found the electronic transmission "bus" and there's a single "BRN" wire depicted on C11. The odd thing is that there is ANOTHER wire on C11 - one colored LT BLU/WHT.

Questions:

1. Is the wire on C11 the one that controls the lockup of the torque converter that, when spliced and controlled through a two position, three poll switch, allows manual control.

2. Canadian Rigger's pictures on rigging a high idle showed the middle connector has a lower row labelled A1 through A12. The chilton diagram breaks down designators from A through F. What I'm trying to determine is whether a connector with C-designator connection points exists and if in fact the wire at C11 is the wire the Heath blog is referring to that controls the torque converter lockup.

3. Why does the wiring diagram show two wires going to the same poll - both brown and light blue/white?



 

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Chilton's shows a brown wire to C11 on the tranny plug to the ECM, not sure about the blu/white.
 
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