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Excellent!

So it worked then?

That's exactly what I was going to do when I purchased a take off from someone with a supposedly bad PMU. I tested the takeoff and it was good so i just swapped out the entire PMU. I'm sure someone would sell you a bad PMU cheap, Seems a lot of people just eliminate CTIS, chances are slim all...

The Spicer CTIS troubleshooting PDF was a help. Don't know if it's in the sticky, but do a search for the link and download it. I tested the pins on the PCU and it indicated a bad solenoid. I see you have two A2's, swap the PCU from the good one if the pins test bad to check before you go...

Don, mine turned out to be the PCU, Pneumatic Control Unit. Under the shield to the right of the shift tower. I swapped that out with a take off someone sold me and presto, everything started working. I do have to have the head lights or park lights on on to see the dots working on this...

Not recommended to unplug or plug in the ECU under power my friend. (I'm guilty myself trying to figure this out, but read not to afterwards). Hopefully I'll get a chance to start substituting parts from my tractor sometime this weekend when the sun does it's job :)

Same problem here. Only time I get any of the dots to light up is when I hold the button down. I get no cycling whatsoever. Yours cycle at all? I've got a couple other A2's so I might start substituting parts this weekend. Let me know if you figure it out before I do.

Can't find anything about the CTIS no lights in the TM's, but did find this in one of the threads http://dana.com/wps/wcm/connect/25f359804b1f69fba8acfff859534476/DEXT-axts0015-0710_CTIS_TroubleshootingGuide_LR.pdf?MOD=AJPERES&CONVERT_TO=url&CACHEID=25f359804b1f69fba8acfff859534476

Borrowed the PPV from the 923, still nothing. No cycling, no lights. Did find Spicer CTIS troubleshooting PDF in another thread, I'm hoping the speed signal generator missing from this truck will turn out to be the culprit.

Nothing about zero lights but does about the overspeed warning being on. Guess I'll start the troubleshooting there. Good thing I have extra A2's around, I can substitute parts for troubleshooting on the fly when it warms up a little that is. :)

Have. Its been up to 150. Ppv is stuck.

I hope :)

All my other trucks start flashing without turning the lights on. This one is dead either way. No flashing lights, no cycling. Is it possible because my ppv valve is frozen that's why I get nothing. I get the backlight with the lights on but none of the little dots lit up, all my other trucks...

What would that have to do with it guys?

Finally got a chance to jump my wrecker which was towed home. Got it started and drove it down the driveway. None of the CTIS lights are coming on. Anyone encounter this problem before? Should I exchange a known good ECU as a start figuring it's most likely the ECU?