2000 T2000 Fan Clutch/Throttle position Problems

i have a 2000 kw t2000 that is having problems with the fan staying on and a ses code for the throttle position.

When I switch the fan from auto to manual the ses light goes away but it acts like it's barely picking up a signal from the throttle. It is not driveable and it's barely moveable when I switch the fan to manual. When it's on auto it drives fine but the ses light is on until you touch the accelerator pedal and sometimes the jakes stay on even after tapping the accelerator. It's like one part or electrical interference is causing all of these problems.

Any ideas?

 

Any ideas?

 

Sorry I forgot to mention, it's a 60 series 12.7 Detroit

 

Ok I'll check that out today

 

Well I checked out the ecm and harness wiring, everything seems to check out. The ecm is covered from oil because of an oil leak but it seems ok. Any other suggestions?