Insite says turbo spinning when truck isn't running

[tree98]

(05-28-2020 )snailexpress Wrote:  

(05-28-2020 )tree98 Wrote:  I installed the new speed sensor and drove the truck for about 5 hours and the check engine light stayed on the entire time. Today I drove for about 30 minutes and all of the sudden the cel went off!! Drove for over 2 hours and light stayed off, I got back to the shop hooked up insite, turbo speed at 0 with engine off!! So it must have been the speed sensor. This is the second replacement sensor on this engine(75,000 mi.) I wonder if cummins got a bad run of them ?? This saga actually started here http://rawze.com/forums/showthread.php?tid=5249
I'm wondering if the factory routing of the sensor cable is to close to the turbo and it doesn't hold up long to the heat?? Although if that were the case we probably would have heard about it by now from other X15 owners/drivers. I don't know but either way I routed it further from the turbo housing this time.

I don't think the sensor is bad. I had similar problem with my 871. Mechanic was working on the front and top of the engine. After he finished engine set CEL and Insite said was bad turbo speed sensor. Zero RPM reading. We checked wiring first as it going thru area where mechanic was working, everything looks good. Next day I went to Cummins for new sensor but when I was back old sensor start working and was working rest of engine life. Have trip back to return this expensive sensor.

Geeez...... well I guess we'll see but I've been messing around with this thing, shaking wires, looking at plugs, etc. And nothing ever happened until I replaced the sensor again and ran it for a while.