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Originally Posted by Dbacks2k4
I know this was an extremely old thread - but the explanations and diagrams were super helpful in fighting the same "dark shift panel" issue on one of my '05 IC RE300 party buses with MD3060. Throwing code 23-12 "Primary Shift Selector or RSI Link Fault"
In my case I was fortunate enough to have a twin bus to test known good TCM/ECM and shift selector to help eliminate dead modules. Starting to look like a bad wire in "S" harness somewhere. I've got +5v on N and a fluctuating/dropping 2-5V on R. 0 ohm resistence on ground P. I can't find any wire or terminal damage so maybe just the connectors in my case.
Did any of you working this issue try replacing the harness altogether or just fix the individual wires? OnCommand hasn't been super helpful with part numbers... I think maybe its 456016001 but hard to tell based off description "Harness, Electrical Transmission" with no diagram or photos
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Twice so far I fixed the individual wires.
From what I have learned so far, there are three segments of the cable.
Segment #1) is the key pad and it short tail.
Segment #2) is the cable that connects to the push pad and goes back to the tranny.
Segment #3) goes from the tranny to the TCM.
I found it real easy to test segment #2) by simply shorting two wires on one end (pushpad) with a small paper clip.
If you use three paper clips you can test 6 wires at once.
At the transmission end, disconnect the plug, put your meter to ohms and check for continuity.
This is best done with an analog meter and not a digital but a digital will work just fine.
An analog meter is better for testing wires that are slightly corroded and would cause a condition recognized as a “high open”. Some current will flow but it will be weak and distorted. A digital meter cannot detect this as well as an analog. You could use a cheap harbor freight analog meter, this is not rocket science.
If you have good clean continuity from the tranny to the bush pad and find all is good, then test from the tranny to the TCM connector.
Please don’t forget to disconnect the TCM fuse and batteries so you don’t accidentally short something out.
Both my wires were rotted out at the connector itself. I simply cut it out and placed a jumper, no more connector. If I ever need granny removal, I will replace the connector then, not now.
If you need more info I would be happy to help best I can.