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Topic: Allison Transmission Fault Codes, Retarder not working (Read 5969 times) previous topic - next topic

Allison Transmission Fault Codes, Retarder not working

I have a 1997 Allinson 3060R transmission. I installed the joystick, joystick module, and y connector from FT. No brake relays in new harness to joystick. No light at retarder switch, pulled bulb and it is not blown. Transmission fluid changed by Cummins dealership in 2017 along with both filters. 54,000 miles on coach.

This is my first diesel pusher. I don't know if my retarder has ever worked during my ownership. Turning on the switch didn't ever make a difference in braking. I don't remember if the retarder switch "lit up" when I bought it. It would not give an oil level at transmission pad, took it to MOT for bulkhead work and they did some diagnostics on transmission without success last spring (2018) for not being able to do the oil level check from the transmission pad.

The motorhome drives and shifts well. I've gone 12,000 miles since July 2016. Been to Albuquerque, Pagosa Springs, etc. multiple times. Have just set up my toad and wanted the joystick because of all the mountain driving I do and will do upon retirement six months from now. Drove it to test joystick. Drove and shifted well, no apparent retard activation at 45 mph, gas off, all positions explored, retard switch on and off.

Fault code: d1-4523 "h solenoid circuit open" according to Barry Beam diagnostic sheet
Fault code: d2-3323 "sump temperature failed high"
No other fault codes.

My Allinson TCU is located streetside pass through storage bay, stern side of wall. Has three large connectors. This is a 1998 U270 36 footer, 325hp C8.3 Cummins built in February 1998. I live in McKinney north of Dallas. I have modest electrical diagnostic skills. Once rewired a 1951 Chevy, have added many accessories to cars, trailers, motorhomes,  repaired rodent damage on Miata, bass boat, scooter, have done some home wiring.

Looking to start simple, doable and then punt to professionals if necessary. I work full time and fight for time. Coach is currently next to house and up on safety stands to allow me to get underneath coach to check connections at transmission. I need a windshield replaced, so one thought is to take to Nach and let FT sort it out if necessary, or go into Dallas to the Allinson repair facility. Not too confident in the local dealerships. Nobody wakes up wanting to work on a motorhome at a commercial truck dealership.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #1 –
My retarder has quit working a couple of times, giving this relay a rap with a handle of a screw driver gets it back in business. Reminds me I need to replace it..... located in the mess of wires ahead of the Allison touchpad.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #2 –
Worth a try, I'll try to find it. Thanks, really appreciate the photo, that makes things a bit easier.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #3 –
Use a signal tracer connected to the xmision end.  You will be able to find the relay easily.  Just connect the xmitter at the xmision and use the wand to locate the relay.  There are a lot of tracers out there, and most of them have to do with tracing computer wiring around thru complex cable bundles.  The "screw driver trick" doesn't always work.  Have a great day  ----  Fritz

Re: Allison Transmission Fault Codes, Retarder not working

Reply #4 –
I don't have a signal tracer in my tool kit. Do you have a recommendation?

Re: Allison Transmission Fault Codes, Retarder not working

Reply #5 –
Quote from: Realmccoy –
It would not give an oil level at transmission pad,
Fault code: d1-4523 "h solenoid circuit open" according to Barry Beam diagnostic sheet
Fault code: d2-3323 "sump temperature failed high"

With these codes/symptoms you need to check your trans. communication cable connections. The one on the trans can get dirty causing false info. The ones on the ECM in the drivers side foot kick panel need to be checked. You could have a cable that is frayed or a mouse has ate the insulation can cause problems.  Once you check cables clear your codes then go for a drive and see if they return.  If they do consider going to  Stewart & Stevenson | Home in Longview to have them look at it. They are familiar with Foretravels as they are where most places in Nac. send there trans troubles to have them fixed.

Mike

Re: Allison Transmission Fault Codes, Retarder not working

Reply #6 –
Hey RealMccoy  ----  I have the TT100 tone tracer from "Test-Um Inc".  Go to  "www.Test-Um.com"  This is a nice sized unit to pack around with you.  I keep mine in the MH because that is where I use it most.  Have a great day  ----  Fritz

Re: Allison Transmission Fault Codes, Retarder not working

Reply #7 –
Quote from: fkjohns6083 –
Hey RealMccoy  ----  I have the TT100 tone tracer from "Test-Um Inc".  Go to  "www.Test-Um.com"  This is a nice sized unit to pack around with you.  I keep mine in the MH because that is where I use it most.  Have a great day  ----  Fritz

Fritz,

I totally agree.  My tone chaser is a Fluke Pro3000 brand but it accomplishes the same job.  I have found it invaluable both in the coach and in my previous stick and bricks abode. 

Richard

Re: Allison Transmission Fault Codes, Retarder not working

Reply #8 –
It's over the bridge now but I think you should have gotten the retarder working first then worry about the stick.We have had ours
to Alaska and back and thru mountains with just the rocker switch which works good for me.Think you need to find a shop to
diagnose and go from there,the joystick seems to have added to the confusion.Have you manually checked the fluid level with
the dipstick,don't assume the shop put the right amount in.Not sure when the cutoff was but some of the transmissions near
that year don't have the electronic dipstick yours may be one of those.If you can find a shop that works on fire trucks they may be
retarder knowlegible,when you say retarder to some of these shops they think you mean an exhaust brake.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #9 –
Hindsight is Foresight in a Foretravel. 

Re: Allison Transmission Fault Codes, Retarder not working

Reply #10 –
Not sure what that means with trying to fix your problem.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #11 –
You failed to mention if these are ACTIVE or INACTIVE CODES.  You said it wouldn't indicate an oil level on the keypad, does any part of the oil indication sequence display or does the sequence fail completely.  If you have no shorts or opens in the harness and the connections are clean, it sounds like a transmission ECU is in order.  If you have done the procedures in the trouble shooting chart and have not found the problem, a trip to Stewart and Stevenson is next.  I have used the one in Houston with great success and assume the one near you would be the same.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #12 –
Due to work schedule can't do anything until Monday.  Will start with connections, clear codes, and do test drive. Will post results of test drive. Borrowed tone tracer from work. I'm also studying the touch pad procedures to better understand them, especially the check fluid procedure.  Transmission fluid level has been checked on stick at operating temp. It is on mark and smells fine and looks new.  Thanks for the help.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #13 –
Stewart & Stevenson, Longview, replaced P3 carrier on the transmission in our 1997 U295 in August, 2016. They were courteous, effective, and familiar with working on a U295. If you don't find the solution locally, they may be able to help.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #14 –
Is this round electrical connector on my transmission the retarder electrical connection? And if it is, how does it come apart?

Appreciate info on Longview trans shop. That is now plan B.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #15 –
Should be able to pull that metal clip and wiggle loose.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #16 –
But, clean the area around it very well before removing-- you don't want dirt in there!

Re: Allison Transmission Fault Codes, Retarder not working

Reply #17 –
On to plan B. Have an appointment in two weeks.

Re: Allison Transmission Fault Codes, Retarder not working

Reply #18 –
Before doing anything else, contact John-- this is what he does for a living: Transmission Instruments

I do not know if he deals with retarder function, but shift pad and ECU's are HIS THING!

Re: Allison Transmission Fault Codes, Retarder not working

Reply #19 –
Update: Picking up motor home from Stewart Stevenson in Longview tomorrow afternoon. The connection plug for the retarder was bad and the temperature sensor in the transmission was bad, which also required replacement of an internal wiring harness. They have road tested the vehicle and no more error codes, can now check fluid levels from the selector, the retarder works including all joystick positions. After driving without a functioning retarder, I'm looking forward to driving the mountains this summer on my trip to the Conejos in Colorado where we will camp with my son and family. Then off to Portland. Last summer I really struggled in a few spots around Philmont and Red River NM to hold speed with just gearing.