Cummins ISL400 runs and quits... questions
I'm currently stuck in a RV campground with a engine that won't run. I called and talked with the nearest Cummins service center and the tech on the phone says he thinks it's the lift pump. The pr...
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I had an issue with my 03 Dynasty right after getting it in 2007. Very similar situation with the exception that we were driving it and it shut down. Restarted and shut down again almost instantly.
After going through the wiring schematic I noticed that it was tripping a circuit breaker in the front run panel. I unhooked the three (or four, can't remember exactly) wires from the circuit breaker and ohmed each one out. Found one directly shorted to ground. Traced it and found it was connected to the front television lockout feature. The previous owner had at one time messed with the front television and apparently pinched a wire. I don't know how long it had been pinched but it decided to wear through and short to ground after we took ownership.
I left the wire disconnected because at the time I was diagnosing this on the side of the road. Once I got home I removed the television and found the problem and repaired it.
On a side note, the lift pump should not run as long as the Cummins tech told you. If you are priming the system such as after a fuel filter change and turn the key on it will run for a couple of minutes. I generally cycle this a couple of times to ensure the system is primed. Once fully primed and prior to starting it will only run about 30 seconds or so. I ended up changing my lift pump in 2007 due to leaking from the ULSD diesel but it was still working fine. PITA to change due to its location nestled right up next to the frame on the side of the engine.
On another note, DO NOT let them tow the coach with a front end or wheel lift style tow truck. Only let them tow it on a low boy trailer. The reasoning is that with a tag axle coach when the front end is raised it exerts a lot of leverage and pressure which ends up being transferred to the tag axle mounting locations at the frame. They will break away from the frame if not towed properly and by properly I mean on a lowboy trailer.
In 2009 (I think that is the year) Monaco added some gussetting to the vertical supports for the tag axle where they meet the frame but they still recommend not lifting the front end to tow. I borrowed a coach from my local dealer and made copies of the gussets and added them to my 2003 as a little extra ensurance but please insist on a lowboy trailer if you need to be towed.
Mike.
After going through the wiring schematic I noticed that it was tripping a circuit breaker in the front run panel. I unhooked the three (or four, can't remember exactly) wires from the circuit breaker and ohmed each one out. Found one directly shorted to ground. Traced it and found it was connected to the front television lockout feature. The previous owner had at one time messed with the front television and apparently pinched a wire. I don't know how long it had been pinched but it decided to wear through and short to ground after we took ownership.
I left the wire disconnected because at the time I was diagnosing this on the side of the road. Once I got home I removed the television and found the problem and repaired it.
On a side note, the lift pump should not run as long as the Cummins tech told you. If you are priming the system such as after a fuel filter change and turn the key on it will run for a couple of minutes. I generally cycle this a couple of times to ensure the system is primed. Once fully primed and prior to starting it will only run about 30 seconds or so. I ended up changing my lift pump in 2007 due to leaking from the ULSD diesel but it was still working fine. PITA to change due to its location nestled right up next to the frame on the side of the engine.
On another note, DO NOT let them tow the coach with a front end or wheel lift style tow truck. Only let them tow it on a low boy trailer. The reasoning is that with a tag axle coach when the front end is raised it exerts a lot of leverage and pressure which ends up being transferred to the tag axle mounting locations at the frame. They will break away from the frame if not towed properly and by properly I mean on a lowboy trailer.
In 2009 (I think that is the year) Monaco added some gussetting to the vertical supports for the tag axle where they meet the frame but they still recommend not lifting the front end to tow. I borrowed a coach from my local dealer and made copies of the gussets and added them to my 2003 as a little extra ensurance but please insist on a lowboy trailer if you need to be towed.
Mike.
