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Topic: Snake eyes (Read 458 times) previous topic - next topic

Snake eyes

Had the Allison pad throw snakes the other day on us.

Engine on and off and it cleared up and the trans shifted fine.

Did it a few times long ago.

Does the pad retain that kind of info?
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Snake eyes

Reply #1 –
Bob,

Quite likely.  Really depends on what the problem was that caused the snake eyes.

Ignition on, engine off:
Push up and down arrows on shift pad once.
Push them again.  That will bring up diagnostic codes (if any).

Format will be d-1 followed by numbers.
If d-1 and - -, there are no stored codes.

If there is a d-1, push mode button to bring up d-2,3,4... until you see a d- number - -.

Let us know what you find.
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: Snake eyes

Reply #2 –
Snake eyes is non-communication between the ECU and the keypad. Normally it is caused by the power supply and sometimes just the large connectors on the side of the ECU needing to be reset. 
1994 U280, Build 4490
Deming, NM.

Re: Snake eyes

Reply #3 –
Yes, bad voltage can cause it.  Voltage spikes, loose gang connectors at ECM or at shift pad.......

And some will store a code. 
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: Snake eyes

Reply #4 –
Bob,

You may recall I went through this "Snake Eyes" exercise a year ago.  Back then, you made several references to your shift pad occasionally acting up.  I hope it has not progressed to the dreaded "D1 69 32" code, otherwise known as the Kiss of Death.  But if it has, at least the solution is well known.  My shift pad/ECU has performed flawlessly since being rebuilt.

No start, with Allison "snake eyes" (Problem Solved)
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Snake eyes

Reply #5 –
Guess I need to actually perform the service fix I posted
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Snake eyes

Reply #6 –
If you had it rebuilt by the guy in Texas then most likely it is a connector. When I put mine back in one of the ECU connectors was not fully engaged. They go in fairly snuggly and as I recall they click.
1994 U280, Build 4490
Deming, NM.

Re: Snake eyes

Reply #7 –
Quote from: Twig –
If you had it rebuilt by the guy in Texas then most likely it is a connector. When I put mine back in one of the ECU connectors was not fully engaged. They go in fairly snuggly and as I recall they click.

Unfortunately I have not touched the unit.  Thursday next week goes in for massaging
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Snake eyes

Reply #8 –
ahhhhh, ok. Keypad AND ecu, he rebuilds both together. You are lucky. I was in the middle of the Mojave desert by myself and it was a 7 day turn around.
1994 U280, Build 4490
Deming, NM.