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tranny light after start
1994 U280 8.3 Cummins, 3060 Allison...sometimes .....after initial engine start of the day, the check transmission light flickers on and off accompanied by the lights on the shifter control, then after a bit light remains steady and "chicken...

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Re: tranny light after start
Reply #1
Using the shift pad, check for transmission DIAGNOSTIC CODES:

Ignition on, engine off

Push shift pad up and down arrows at the same time.

Yours is right at the cusp of having fluid level checked from this shift pad.  If you have this feature, you...

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Re: tranny light after start
Reply #2
...light remains steady and "chicken feet" appear in the shift control...
If the photo below looks similar to what you are calling "chicken feet", that may possibly be a early warning sign of...

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Re: tranny light after start
Reply #3
well as luck would have it, all acted normal when I tried just now...I did the simultaneous up n down arrows and:
 
D1 code 35, secondary code 0  0 "power interruption" 
D2.code   6  9,  secondary code  3  2 "SPI communications link fault in ECU"
...

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Re: tranny light after start
Reply #4
Using the shift pad, check for transmission DIAGNOSTIC CODES:

Ignition on, engine off

Push shift pad up and down arrows at the same time.

Yours is right at the cusp of having fluid level checked from...


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Re: tranny light after start
Reply #5
D2.code  6  9,  secondary code  3  2 "SPI communications link fault in ECU"

...read the codes fingers crossed its start battery voltage...
I wish you luck with your crossed fingers approach.

If...

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  • Twig
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Re: tranny light after start
Reply #6
A call to John at Transmission Intruments  wouldn't hurt. He will know what's wrong and what you should do.

Re: tranny light after start
Reply #7
'preciate all the info!

Re: tranny light after start
Reply #8
I wish you luck with your crossed fingers approach.

If positive thinking doesn't eliminate the problem, then you can expect it to get progressively worse.  Eventually, you will come out one...


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Re: tranny light after start
Reply #9
Just out of curiosity, is the transmission being lubed if the engine is already running and the Fault occurs, why won't it let you start the engine

Re: tranny light after start
Reply #10
Just out of curiosity, is the transmission being lubed if the engine is already running and the Fault occurs, why won't it let you start the engine
The "No Engine Start" scenario occurs when you...

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Re: tranny light after start
Reply #11
Yes, snake eyes can occur both before start up and while running.

It indicates a serious issue with transmission/transmission electronics.

That should throw a DIAGNOSTIC CODE that you can retrieve from the shift pad as has been discussed many...

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Re: tranny light after start
Reply #12
Well now you have, turn on the switch, start the engine, indications on control pad flash on and off along with transmission light then snake eyes, still haven't done the batteries they test ok but are 11 yr old red tops, I'm also headed...

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Re: tranny light after start
Reply #13
Yes threw the codes, thing is it's extremely intermittent and has never occurred while driving...have reviewed the codes

Re: tranny light after start
Reply #14
So, what are the the codes/what do the codes indicate is the problem?

Re: tranny light after start
Reply #15
In Reply #3, the OP reported two stored codes:

D1 code 35, secondary code 00 "power interruption" 
D2 code 69, secondary code 32 "SPI communications link fault in ECU"
D3  -    -

Re: tranny light after start
Reply #16
In Reply #3, the OP reported two stored codes:

D1 code 35, secondary code 00 "power interruption" 
D2 code 69, secondary code 32 "SPI communications link fault in ECU"
D3  -    -


ok folks,...

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Re: tranny light after start
Reply #17
What you can do before contacting John (above):

Check that all connections from chassis battery to dash (both positive and ground) are clean and tight.

Unplug and replug both shift pad and Allison ECU (under driver's side of dash).  If you have an...

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Re: tranny light after start
Reply #18
What you can do before contacting John (above):

Check that all connections from chassis battery to dash (both positive and ground) are clean and tight.

Unplug and replug both shift pad and Allison...


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Re: tranny light after start
Reply #19
Shouldn't be any relay under the dash clicking on and off with the ignition on.  The IGNITION RELAY/SOLENOID may be failing.

When this happens, do you loose other functions that only work with the ignition on?  Turn on the dash HVAC fan-- easy to...

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Re: tranny light after start
Reply #20
Shouldn't be any relay under the dash clicking on and off with the ignition on.  The IGNITION RELAY/SOLENOID may be failing.

When this happens, do you loose other functions that only work with the...


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Re: tranny light after start
Reply #21
When you raise the dash, there will be a label on the part that lifts.

It will show you which TWO fuses go to the Allison (one for memory and one for "run").

Outboard of the fuse boxes is the ground strip.  Check that all the nuts on it are tight.

...

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Re: tranny light after start
Reply #22
When you raise the dash, there will be a label on the part that lifts.

It will show you which TWO fuses go to the Allison (one for memory and one for "run").

Outboard of the fuse boxes as the ground...


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Re: tranny light after start
Reply #23
well, read all the posts, checked everything I possibly could, swapped out the shift pad with a friends, problem stayed in my coach, got the same codes, it would fault immediately on switching on the ignition, pointed a small space heater at the...

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Re: tranny light after start
Reply #24
...is there any trick to removing the ECU?...
Nothing tricky.  Unplug the connectors - remove the mounting screws.  Photos (link below) of what I sent in for rebuild.

No start, with Allison...

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