ok truck was stumbling and dead pedal so I ordered a new apps sensor from Tim on DTR. Got the unit put it in yesterday it stumbled a little and throttlke was a little rough but worked way better then the other sensor then today the truck is at a dead pedal again.

Here is what I have done.
1. Check ECm voltage checks at 5 volts like manual states on apps plug
2. checked continiuty from the ground on the plug (black yellow) to the ground on battery it was 018 good enough
3. phoned tim and he gave me the test on the sensor it checked out from .39 at idle to 3.89 on #3 wire in the apps plug at WOT so its good he suggested running a wire form the apps plug ground to neg tried that no difference.
4. truck throws the 0121 apps unit issues or 0122 low apps voltage steady


where do I go next??????

HELP! Jason

 

Have you checked LP pressure lately?? Fuel filter???
Recheck all wiring connectors for corrosion, wirring damage, ect.

 

ECM I had same problem after chasing my tail around for a week I changed ECM and fixed problem.
Hope this helps, if you need wiring diag let me know.

 

fp is not a issue nor filters the codes do not lie and the truck idles perfect. This is a electrical gremlin or possibily a bad sensor, I have access to another 01 truck tommorrow that I may switch the Apps to see what happens

 

well everything checked out to say that the ecm is fine....

so I changed it anyway being I had a MAD ECM in the garage that was throwing a 0604 code (ecm software issue) all summer I pulled out to put in the stock ecm to solve that issue. Anyway long story short the truck rines fine again with no codes? Head scratcher ehh

Thanks for the help guys

Jason