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How do I take apart the pump seals? I've se n the ones with a hex and those can be spun off. With the circular top fitting I can't figure out how to get it off. It spins but doesn't unthread

Hand pump is not pushing any fluid out return port, return line is sending fluid to pump. There was significant restriction blowing into the return port. It appears on the bottom of the direction selector there is a very small orifice fluid has to pass through. I removed this and replaced the...

Let off the throttle and the light went off. Since these motors are so pricey I decided to get a reader, bought a surplus ICE test kit. After fighting with scratched DVDs and old computer hardware I got : 102-07 "Boost Pressure Sensor Not Responding" A quick search indicated a boost pressure...

I can talk to engine ecm, transmission tcu, Spicer CTIS. Wabco ABS seems to be a little different? Using Dearborn 3+ and can seem to connect over J1708 but wabco software doesn't really show much data, most fields are blank. J1939 doesn't seem to work at all. This is through the port to the...

It's 3/8 NPSM (national pipe straight male).

Good deal, just found one of these I'll be playing around with shortly.

I thought there were 2 types of black controller, one that could be accessed with the diagnostic port and one that couldn't?

Thanks Ronmar, after I took it off I realized it was on the other side...brain fart. Rebuilt the wheel valve and it was a bit crusty and the stainless orifice looked like it had been overtightened as the hex was a little rounded and had burrs. Just refilled the tire and it didn't push any out...

Z and H have power now (was originally Z, M, and H

I'm betting there is just enough of a restriction (most likely wheel valve filter) to keep the valve open. There was some oil in the system so I wouldn't be surprised if those filters lowered their flow a little.

This issue only occured at the increase of pressure to 80+psi with CTIS. At 50ish it wasn't doing it. When in stable state (not bleeding out qrv) all tires hold pressure (after rebuild on 2 that were leaking). Seems like a wheel valve(or two) aren't closing well (aire flow out it pretty fast...

Please clarify your question. There are 3 1911 wires in my truck, I had to cut them check since they are all connected. I have the "first gen" of the black controller, that I got off eBay.

I have an MTV and disconnected M wire only. Now goes to 82 psi hwy(using a very cheap pressure gauge). Problem is, now when I turn off the truck the quick release valves open on the front axle and the rear most axle. My front right tire goes down to 50 psi and my rear right tire goes down to 55...

Checked the sensor, had some gunk, also inspected all orings in the PCU. Reassembled everything and same error. Did check the relief valve while functioning and it appears to be correct as pushing or pulling on the plunger resulted in less dump valve air release. One time the controller...

Unfortunately without sensor specifications I'm guessing on proper sensor voltage. Heck the 0-150 sensor is .5-4.5V for the recommended versions. Being that my sensor does inflate the tires to 55psi on highway that makes me think it may be okay but it's possible low pressure readings are not...

Wonder if the CTIS unit I bought is programmed for a different relief pressure? Anyone know what that additional sticker means? This was for an lmtv and I have a MTV so there are 3 dump valves vs 2....wonder if there is a programming difference causing the issue.

Was looking at my 2007 A1R MTV today requarding this and it doesn't have that same brace... almost looks like the housing could come off just by moving the trans aux cooler lines. Not sure if it has the updated sleeve bearing or not.

For sure on proper input. I tapped the wires so reference voltage was being supplied by the controller.

Do you know if that sensor is gauge pressure or atmospheric? I get .553V with no pressure in the system, truck off. If atmospheric I should have .739V for my elevation. If gauge, that means there could be pressure on the sensor, faulty sensor, or we don't have the correct scale for the sensor...

Awesome, that give me a few things to check out. No I didn't remove the sensor but knowing that data I can bench test it. I know I have some very small leaks on the wheel valves I haven't rebuilt but they are very slow (tiny bubbles slowly forming).