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CTIS pressure settings increase - no programming, transducer, or module required.
- Thread starter GeneralDisorder
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7.83 MB file on MEGA
Thank you!7.83 MB file on MEGA
mega.nz
I’m hoping I understood all this correctly so here goes.
The usual issue, CTIS controller bricked with 5 solid lights, so it’s been unplugged for awhile. I just purchased a “NOS” unit from eBay Which I “think” is what I can use.
First unit is the original, second is the replacement. I’m not 100% on this but I believe the original is 2007, Mar 30 and the replacement is 2024, Mar 3.
It’s my understanding if I just plug the new unit in I would be good to go, with the old 55psi highway pressure, but if I cut a certain wire I would end up with 81 psi highway.
1998 1078.
Am I in the ballpark here or just wayyy out left field?
The usual issue, CTIS controller bricked with 5 solid lights, so it’s been unplugged for awhile. I just purchased a “NOS” unit from eBay Which I “think” is what I can use.
First unit is the original, second is the replacement. I’m not 100% on this but I believe the original is 2007, Mar 30 and the replacement is 2024, Mar 3.
It’s my understanding if I just plug the new unit in I would be good to go, with the old 55psi highway pressure, but if I cut a certain wire I would end up with 81 psi highway.
1998 1078.
Am I in the ballpark here or just wayyy out left field?
Ronmar
Well-known member
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It may not be cutting a wire but changing a wire(applied voltage) from one pin to another pin in the connector…
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- Texas Hill Country
You may want to review the schematics in post #98 and the programming in post #99—
I believe I need to apply power to pin Z on P110. I’m a bit confused on Pin M though. In one place it says pin M is not used, but in another place it says Pin M has power.
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Some posts are discussing using an older ECU unit which requires modification in newer trucks.
In post #98 the schematic for M1078A1 appears to show 24v optionally from H or Z, with M unused. What the schematic doesn't make clear is how or if the options access the different programs—
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- Croswell, MI
If you move the pin in cavity M in the wire harness connector to cavity Z, that will give you M1089 Wrecker programming with 81 psi Highway.
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You don't have to do that - just cut wire number 1911 and leave it as an open circuit. That will enable 81 psi mode (M1088/M1089).
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- Croswell, MI
So configuration 3 is the same as 0? Is that confirmed?
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That's how I have my truck wired. I can select 55 or 81 with a toggle switch. Works with all the controllers I've tried.
I went over that in post number 1 of this thread.
I went over that in post number 1 of this thread.
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- Croswell, MI
I see it meow. After 7 pages and all the reading, I lost track of the wires you did.
So meow, I'm left wondering..... what's the actual difference between 0 and 3? Is it the overspeed warnings, or are the modes other than Highway pressure settings different?
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Nothing that I can find. Looking in the software all the settings match 1088/1089. I just went with it. I was going to reroute to pin Z but my truck has no wire there so just because I'm lazy I checked the settings with it just cut and it was already set to what I wanted so I just left it that way. I've tested several modules and they all seem to be set that way.
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- 41
- 18
- Location
- Croswell, MI
That sucks. So we have confirmed that 2 of the 9 programs are identical to each other. Once I get my CTIS leaks fixed I'll have to change around the pins through all the programs and find out for sure what's up with each one. My A0 doesn't have the CAN, so it'll be running it through all the settings on each one.
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I'm guessing they copied the higher pressure map over to all the unused program slots so if there's some wiring malfunction and it loads a different profile it's less likely to be "too low" as that would be more dangerous than too high if you're heavily loaded. But I have not actually checked them all.