Finding shorts with this?

[Kid Rock]

(07-13-2017 )Rawze Wrote:  

(07-13-2017 )Kid Rock Wrote:  Is there a good way to rule out the ecm? Maybe by testing for voltage at the particular pin that sends the signal for the circuit I'm testing?

most of the time when it is the fuel shutoff issue, it is the solenoid going bad. A short in the coil can also burn out the circuit in the ECM sometimes too.

Well thanks to your tip the other day i was able to make delivery and am now deadheading back home... if it was just the fuel solenoid i would probably keep running it but the code 0245 fan control circuit has turned the fan off. Replaced the fan solenoid, but no change. Had a spare fuel solenoid too, threw that on, no change either

Didnt know if there was a way to test the ecm pins before i start tearing down the wire harness... i did notice some light green film on a couple of ecm pins, tried a few different ways to gently cleam it off but didnt work.

Both of these circuits starting throwing codes (0245 & 0254 ) at the same time: and the jake brakes stop working too, lovely multiplex issue i guess