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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 11-23-2018
The Fuenti The Fuenti is offline
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Default slashes (snake eyes) on Allison keypad

Hello All,

I am in Roseville, CA at a campground with a problem with the transmission keypad.

During the trip, I encountered the problem where I would turn the ignition but the keypad showed 2 slash marks or snake eyes. After reading posts, I checked the connection on the keypad, snapped it tight, problem solved.

Next day, I had the same issue; however, did not work after securing the connection. After a little more reading, I got some electronic components cleaner, put a little on each pin, slid the connectors gently in and out a few times (so as to clean the pins), snapped the assembly and problem was solved for the next 2 days.

This morning, I encountered the same problem, except that nothing is working. I started the engine at the starter solenoid, the engine started, but I still show slashes on the keypad.

Any suggestions would be appreciated. In particular, the location of any fuses, boxes, computer, where the harness runs along the coach, etc.

Thanks!
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Grand Terrace, CA
1995 PT42 S60
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  #2  
Old 11-23-2018
The Fuenti The Fuenti is offline
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Default Update

Update so far...

I have located 2 Allison boxes where the generator fan is located. There's a small square black box and a silver rectangular box. Is one of these the computer?

I spoke with a transmission person who was on call who recommended:

1. Check the connections to the battery to ensure that there are no issues. He also stated to check the batteries to make sure that they are good.

2. Locate the computer (I'm assuming one of the two boxes is the computer). He said there are two harness connectors (black and white), and to disconnect the black connector. Pins 2 and 11 are power, and 9 and 18 are ground. He recommended checking for voltage to these pins using an ohms meter. Based on a cursory look at the connectors on both boxes, I fail to see a white connector.

Currently, there is a bit of rain, so I'm waiting for a break in the downpour before progressing with diagnostics.

My plan is to first clean connections and progress from there.

Again, any suggestions are welcomed!
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Jose & Rose
Grand Terrace, CA
1995 PT42 S60
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  #3  
Old 11-23-2018
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atckip atckip is offline
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Location: Brooks
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Default

This sounds simular to my Transmission trouble a while back. Mine would shift into neutral while traveling and occasionally not start from the front. Have you checked the keypad for a code? My ECU was bad, had it rebuilt by RV shifters and all has been well. Check out their website for troubleshooting ideas
http://www.rvshifters.com
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95 WB42 S-60
88 WB40 2010/14
Brooks, GA
Kip Cindy & Cody
678-523-7920
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  #4  
Old 11-23-2018
The Fuenti The Fuenti is offline
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Thank you for the reference, Kip.

I am not able to pull any codes. I followed the instructions for pressing the buttons, and even did so with the aforementioned technician on the phone, but it would not pull any codes. It keeps displaying the slashes.

My coach won't start from either the front or the back. Is the ECU the grey box that is attached to the black keypad?

Is there any way to bypass the ECU so that I can get the coach home? If not, it appears I will need to order a new keypad/ECU in order to get back on the road.

Unfortunately, all the Allison shops are closed due to the holiday (or they opted to not return calls). So in the interim, I'll try to clean a few connectors, otherwise, it appears that I'll be hanging out in Northern California a little longer than I anticipated.

Thanks for the link!
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Grand Terrace, CA
1995 PT42 S60
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  #5  
Old 11-23-2018
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jcs707 jcs707 is offline
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Sounds like you're in the right place ...

VIM (Vehicle Interface Module)
Drivers side, Bay 1, bottom left corner of blower fan.



ECU (Front View)
Drivers side, Bay 1, top right of blower fan.



ECU (Side View)

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Clint & Tammy Summers
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1995 WB 42 "The Magic Carpet" sold
1977 FC 31 RB "BUSTA BUS"
2000 LXI SS "Piper"
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Last edited by jcs707; 12-01-2018 at 10:34 AM.
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  #6  
Old 11-23-2018
The Fuenti The Fuenti is offline
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Default

Thank you. I’ll try and get in there tomorrow and clean the terminals.
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1995 PT42 S60
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  #7  
Old 11-23-2018
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atckip atckip is offline
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Mine was intermittent also. I tried looking for a loose or dirty connection and it would usually clear up. But I was just getting lucky. I had the 69-32 code so replacing the ECU fixed everything.
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95 WB42 S-60
88 WB40 2010/14
Brooks, GA
Kip Cindy & Cody
678-523-7920
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  #8  
Old 11-26-2018
The Fuenti The Fuenti is offline
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Default Waiting on Part

After disconnecting the black harness on the ECU and conducting some simple tests with my handy multimeter (following instructions provided by the Allison Transmission tech), it appears that the problem indeed lies with the ECU.

I sent pictures of the ECU with the pertinent identification numbers to the tech and should be getting my new part tomorrow (Tuesday) and be back on the road to Socal.

Fortunately, the ECU was quite accessible except for some corroded bolts and nuts that required some PB Blaster and grumblings to remove. Fortunately, a quick trip to the local hardware will facilitate the installation process tomorrow.

Thanks for the pictures Kip.
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1995 PT42 S60
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  #9  
Old 11-26-2018
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giderich giderich is offline
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Default TKT Allison Transmision link

If you have difficulty obtaining the part or need further help, Ted Keating at TKT has helped several WOG members with Allison troubles.

https://www.allisontransmissionpart.com/
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  #10  
Old 11-26-2018
CaptPegLeg CaptPegLeg is offline
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Ted is great!
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