ALLISON 2000mh TRANNY PROBLEM, HELP!!!
I run a 02" Winny Journey pushed by Cummins ISB 275, Allison 2000MH tranny. A month ago my VP-44 injector pump started throwing a check engine light and code. I took it to a shop and it turned out th...
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For those more interested in Allison problems than spell checkers, here is what the problem was.
This "Allison" problem was actually a comedy of errors not directly related to the Allison. Here goes!
Took to W.W. Williams in Atlanta GA., and had computer diagnostics run, they determined that codes and initial testing indicated the VP44 injector pump was defective and the lift pump was inoperative, and data link to transmission was not communicating.
Apparently when the lift pump dies the V44 will continue to supply the engine by providing a suction on the the fuel line. In doing so it literally destroys itself in the process. If I had replaced the lift pump ($60) when the first code was thrown, I probably would have saved the V44 pump ($2500-4000). I have since installed a electric fuel pressure gauge on the output side of the fuel filter to warn me if lift pump fails. I also replaced cheap OEM lift pump with a Rapter after market lift pump. ($280) The Rapter maintains 15 PSI/ 10psi WOT to injector pump which relies on fuel for lubrication.
During the install of the V44 the tech pulled loose the data link cable which was then burned on the manifold, and the same tech apparently used a water hose to clean the pump area after install. Water got into a terminal resister on the end of the data link cable causing the trans light code.
This "Allison" problem was actually a comedy of errors not directly related to the Allison. Here goes!
Took to W.W. Williams in Atlanta GA., and had computer diagnostics run, they determined that codes and initial testing indicated the VP44 injector pump was defective and the lift pump was inoperative, and data link to transmission was not communicating.
Apparently when the lift pump dies the V44 will continue to supply the engine by providing a suction on the the fuel line. In doing so it literally destroys itself in the process. If I had replaced the lift pump ($60) when the first code was thrown, I probably would have saved the V44 pump ($2500-4000). I have since installed a electric fuel pressure gauge on the output side of the fuel filter to warn me if lift pump fails. I also replaced cheap OEM lift pump with a Rapter after market lift pump. ($280) The Rapter maintains 15 PSI/ 10psi WOT to injector pump which relies on fuel for lubrication.
During the install of the V44 the tech pulled loose the data link cable which was then burned on the manifold, and the same tech apparently used a water hose to clean the pump area after install. Water got into a terminal resister on the end of the data link cable causing the trans light code.
