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- La Crosse, WI
Big IF is if the pressure sensor is accurate.
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CTIS...soo close to working properly
- Thread starter aw113sgte
- Start date
Ronmar
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well you could unscrew the pressure sensor, connect a low pressure gauge and manually run a deflate with jumpers and see what pressure the relief holds the system at like I do on my manual system to monitor tire pressure…
- 1,062
- 1,551
- 113
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- Wilson County, Texas
Have you rebuilt your wheel valves? Biggest issue is the filters in them causing an imbalance due to being nasty. Also, kinked hoses. Balance is the key, especially with deflation. If you think this might be the issue, try just removing all your filters in the wheel valves to make sure flow is no restricted at all either way. But don't leave it that way.
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Yes I've rebuilt them all now. Fair amount of corrosion although it completely came off with a brass wire wheel, but all filters looked pristine. Did the soapy spray and no apparent leaks now.
- 692
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- La Crosse, WI
Tried tonight but there is a pressure spike that was blowing the hose off so I need to change the setup a little to take that spike. I did push on the relief valve to increase the pressure and the quick release started making a very loud whistle. Can't imagine that is correct.
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- Wilson County, Texas
I have had filters look perfect, but still restrict a lot of flow from oil residue. I couldn't tell you why... it forms a clear slime? If when you rebuilt them you didn't do the air filters, I'd really look at that from my experience.
Ronmar
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No that sounds about right. Should be just a loud honkish whoosh. The more you push on that relief, the higher the pressure in the manifold should be, which would lessen/slow the dump whoosh because the pressure would be closer to the tire pressure... as the dump port closes, it can make some different sounds(ever play a trumpet or bugle
)…- 692
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- La Crosse, WI
Found out that the sensor is reading correctly. So I took apart the relief valve put in a slightly larger o-ring that seals on the surface a little better it seems, and also burned off the adhesive on the adjuster screw and tightened it up a bit to add more spring pressure. Now I'm getting a reading of 8.5 PSI relief, I was only able to do one deflate but the computer didn't complain this time.
- 2,082
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- Portland, OR
Good to know it's that sensitive. Something I'll watch for in future diags. Haven't run into that problem yet with any of the PCU's I've encountered.
- 692
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- 93
- Location
- La Crosse, WI
It's states in the spicer manual troubleshooting this error, if the relief pressure is "within 1 PSI". Of course who knows what the true target is and also the allowable variance.
Ronmar
Well-known member
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Hadnt helped anyone with this issue either. Hope it works
- 1,511
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- TN
Sorry break into this discussion. You seem very knowledgeable on CTIS. I have humming noise coming from the diaphragm area of a front tire's CTIS hardware. The tire looses some air. Can I assume this is likely a faulty diaphragm?
Ronmar
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Or it just has some crap in it allowing tire air to leak past...
- 1,511
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Will report back on this.
- 692
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- La Crosse, WI
Mine is a 2007 and all 6 had a fair amount of corrosion, but they cleaned up really nicely. I was only having one with a leak down issue but I would rebuild all of them.
They are really pretty easy.
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Diaphragm was fine, but found a schrader valve inside the 90 degree elbow!
Ronmar
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- Port angeles wa
I have heard of people finding those. Would kind of tend to interfere with the deflate cycle on that tire I think
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Day 356, still no CTIS function......"No I have not checked them, sure their fine...."
These were not on my truck, but I believe these are spares that came from my M1082.
These were not on my truck, but I believe these are spares that came from my M1082.
Attachments
- 692
- 1,058
- 93
- Location
- La Crosse, WI
Just to update, since adjusting the pcu relief valve the system has been working perfectly for the last couple weeks.
- 1,511
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- Location
- TN
How does the Spicer PCU control the steers vs the rears? Multiposition solenoid? I can get the fronts to dump with pressurizing the deflate line with air, but not the rears.I have heard of people finding those. Would kind of tend to interfere with the deflate cycle on that tire I think