89 Comanche TCU upgrade

[Potterman42]

Yes Eagle I have checked the fuse a couple of times

 

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[ParadiseMJ]

I swapped a 94 AW4 into my 88 and thought (musta read it somewhere) that I needed the 94 TCU that came with it.  Wrong.  The TCU has to plug in to a same COLOR connector.  The break was 1990 to 1991. The 88 TPS input from the 94 TCU showed 0.0  I never got any input reading from the TPS with my voltmeter. So after poring over wiring diagrams I noticed that the 94 TCU used different pins that the 88-90.  Fast forward >> I scavenged a Renix cab forward harness AND a Renix TCU from the yard with the same color connector.  Did the trick.

 

To answer the original question and echo Cruiser...the wiring inside the 91+ TCU is d-I-f-f-e-r-e-n-t.  The pin out is different, the pins all fit, but it's whats inside that counts. There is no advantage to putting in a newer era TCU into a Renix.  If the power/comfort switch is a problem...jump the wires and put it in power mode all the time.   

 

Sorry if I'm rambling, I'm usually in bed by 10.

[Potterman42]

Thanks ParadiseMJ any and all input is greatly appreciated.

 

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[cruiser54]

Thanks ParadiseMJ any and all input is greatly appreciated.

 

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He's the one I learned it from!!

[HOrnbrod]

http://comancheclub.com/topic/41001-tcu-era-differences/?hl=converter&do=findComment&comment=414264

[ParadiseMJ]

...and I learned it by being too damn stubborn to give it up...and listening to the folks on this and other forums.