wolfe10 wrote:
So, tell us how far into the "exhaust brake cycle" you get when this failure occurs:
1. Does the Allison shift pad left window go from "6" to your exhaust brake pre-select gear (can be anything, but "2" and "4" are most common)?
2. Does the transmission start downshifting toward the pre-select gear?
If both of the above happen, my next move would be to temporarily wire a voltmeter or even test light to the exhaust brake solenoid to see if it is being activated.
The trans will go to 2nd when and if it activates and powering the exhaust brake solenoid with 12 volts works. The thing that seems to be the problem is why the brake works perfectly when the Allison computer is hooked up to the data port. Bad connection to the ECU?
There have been no codes since the TPS was replaced.
Thanks for your help!
Mike
