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?
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.
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.
Yes, bad voltage can cause it. Voltage spikes, loose gang connectors at ECM or at shift pad.......
And some will store a code.
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) (http://www.foreforums.com/index.php?topic=25783.0)
Guess I need to actually perform the service fix I posted
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
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.