Truck gives me a message "reduced engine power" the other night.
The temperature gauge goes up too, which I've never seen on my truck. So I quickly connect my Xcal3 and start datalogging the cylinder head sensor and it's reading 235 F! I'm staring to crap my pants at this point when suddenly the temp sensor on the dash throttles to the hot end completely and the message center on the truck reads "reduced engine power". So I pull over and check under the hood. The engine is not overheating. I just installed e-fans about a month ago and I got to know what the rad hoses feel like as well as temperatures I measured throughout the motor with an infrared temp sensor. No boil over, top rad hose seems correct temperature. So a few minutes later I get in the truck and take off. Same thing happens a few minutes later and again nothing on the truck seems wrong.
So I'm thinking I might have a bad CHS, but I wanted to test it a bit first before buying another. They pretty cheap, but it doesn't look easy to get at. Does anyone know what the resistances of this sensor are at given temperatures and is the wiring more accessible somewhere else so I can measure the temperature of it while it is still in the head?
PS: When my truck went into this mode, the check engine light did not come on (and it works) and the A/C did work and I seemed to have normal power. I guess I wasn't in fail safe mode, but a warning mode.