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Topic: Cruise control (Read 383 times) previous topic - next topic

Cruise control

So since they original day of purchase the cruise control has always disconnected when starting to climb a hill during downshifting. Not the end of the world but a nuisance. During our past trip me and Jim (fourdayoff) were talking about it. We both think it is transmission related causing the disconnect. You can easily hit the resume button and it engages till next shift. Never a problem till we are operating in the mountains and needing to downshift. Always reconnects and works till next  shift/disconnect. Is this system connected to the ABS? All ideas are welcome short of selling coach.
Scott

Re: Cruise control

Reply #1 –
Are you referring to manually downshifting? 
Scott Powell
Doylestown, Ohio
2002 U320 3610 WTFS

Re: Cruise control

Reply #2 –
Auto downshifting do to increased load. Also does it manually downshift when loaded up. Fine at low power settings

Re: Cruise control

Reply #3 –
Any chance it is in the ECM programing? The used one you bought had to be reprogramed.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Cruise control

Reply #4 –
I have agree with craneman..  I know mine never drops out of cruise unintentionally...
Scott Powell
Doylestown, Ohio
2002 U320 3610 WTFS

Re: Cruise control

Reply #5 –
Transmission output speed sensor?

Output speed sensor

If you have VMSpc, can you look at error code logs that might have recorded something when this occurs?
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Cruise control

Reply #6 –
Mine won't stay in CC when the retarder is in action. Makes sense to me. 
2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: Cruise control

Reply #7 –
Quote from: Michelle –
Transmission output speed sensor?

Output speed sensor

If you have VMSpc, can you look at error code logs that might have recorded something when this occurs?

If that is the issue, it is very likely that the DIAGNOSTIC CODE is stored in the Allison ECU.  Retrieve it using the Allison shift pad.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Cruise control

Reply #8 –
Quote from: craneman –
Any chance it is in the ECM programing? The used one you bought had to be reprogramed.
Did it with my loaner ECM when I purchased, so doughtfull

Re: Cruise control

Reply #9 –
Quote from: Michelle –
Transmission output speed sensor?

Output speed sensor

If you have VMSpc, can you look at error code logs that might have recorded something when this occurs?
Im using the Bluefire. Does record codes but not showing any. Status unknow but will put my coach OBD scan tool and look tomorrow, but I was thinking earlier that installing my spare Allison speed sensor would be a easy troubleshooting aid?

Re: Cruise control

Reply #10 –
Quote from: Charlieboise –
Mine won't stay in CC when the retarder is in action. Makes sense to me. 
This is normal operation. Select zero on your joystick or just turn it off. There is a workaround patch to by pass the retarder from shutting off but Ive decided  keep it enabled. Some do this also to keep the brake lights from coming on with retarder.

Re: Cruise control

Reply #11 –
Quote from: wolfe10 –
If that is the issue, it is very likely that the DIAGNOSTIC CODE is stored in the Allison ECU.  Retrieve it using the Allison shift pad.
I will contact my Allison Tech/freind and see if he still has a reader for the 4060 trans. 👍👍 that may give a direction. BUT i really didnt think it had a trans input for the cruise control, but the speed sensor probably would? Possibly getting bumped during harder downshifts? Definitely will swap in my spare sensor. Will definitely check shift pad for codes next couple of days. Great Idea I had not thought of.
Scott

Re: Cruise control

Reply #12 –
Just to clarify:

Using your Allison shift pad will tell you if there is a diagnostic code (problem).

But, you will need an Allison-compatible computer to see how the ECU has been programmed.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Cruise control

Reply #13 –
Does the ABS have any input to the cruise control?

Re: Cruise control

Reply #14 –
Quote from: wolfe10 –
Just to clarify:

Using your Allison shift pad will tell you if there is a diagnostic code (problem).

But, you will need an Allison-compatible computer to see how the ECU has been programmed.
Yes and yes, but It probably isn't a programming issue because at lower power settings it almost always works. Never have issue with it 100 miles east of the continental divide. That ECM I installed after purchase is suppose to have the most current programming as of 2020, but who knows till we read what it is.

Re: Cruise control

Reply #15 –
Quote from: dsd –
Does the ABS have any input to the cruise control?

We didn't have it affect cruise control, but it/or the output speed sensor impacted torque converter lockup (and it didn't cause any trans codes)

Transmission seems to be hunting, 2003 U320, need help
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Cruise control

Reply #16 –
So I was actually watching the shift indicator and it would remain in 6L, 5L, 4L. I actually have never seen it out of lockup except for 1-3? after shift followed by lockup. Almost feels like another gear.
Only disconnects when pulling hard during downshift. Immediate use of recall restores cruise control. Repeats going into 4L. Will get codes and probably install new speed sensor I carry as a spare. I probably would have continued ignoring spite the heckling from Jim that his 295 never does that. That ain't right

Re: Cruise control

Reply #17 –
Torque converter should lock up mid to upper second gear and all higher gears under normal driving conditions.

So you should feel 1-2-2 lock up-3-4-5-6 with torque converter always locked in 3-6.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Cruise control

Reply #18 –
The only thing that takes my trans out of cruise is stepping on the brakes or putting on the retarder
or shutting it off with the switch. I believe that the brake light is what takes it out of cruise and if the
retarded doesn't turn on the brake lights it won't take it out of cruise.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport