![]() ![]() I will post what I find during the repair. I am going to concentrate CHT sensor, and will look at the thermostat will change the coolant. In any event I have been unable to put my finger on a ECT sensor. Even though the code reader gave me a temperature of the engine coolant temperature I also read that the CHT sensor calculates this parameter. That explains the engine laboring when it first occurred. I read somewhere that the control module disables 4 of the fuel injectors, alternating the 4 disabled injectors every 32 (I think it said) cycles in an attempt to keep the engine cool. I also noted that the AC kicked off, the cooling fan went to high speed the engine temp gage dropped to 0 which may all be the control units response to the false signal. I wouldn't think that 191 is overtemperature. what I saw was that when the CHT reached 191 degrees the overtemperature light came on. So I put it in the live data mode and ran the truck. I captured the operating parameters And ECT sensor temp was 181. Any device that can access the ECT PID can display that data. I acquired a code reader and it threw a code of P1289 which is pointing to the CHT sensor. My temp gauge sits around there ( midpoint or thereabouts to be considered as 'the 'normal range' ) when up to operating temp - which for me is 205 degrees F on my Scangauge. Thanks for reading this long post and any ideas would be appreciated. Any ides as to what is causing this to happen? I think one of the sensors is going bad but am afraid that if I continue to drive it I will be stranded if it ever goes into limp mode. Continued to drive and transmission temp reached 180 after about 8 miles or so transmission gage began to slowly climb to normal. Checked the digital readout and the transmission temp was 170. Started driving again and transmission gage was bottomed out. So I killed the engine after a few minutes (3 or 4) started the engine back fan on low speed. ![]() Stopped again and checked upper and lower hoses same as before and radiator was relatively cool to touch. After 4 or 5 miles noticed the AC quit working the and the over temperature light came on for the engine. Started driving again and the engine seemed to be struggling temp gage still not working. Pressed the ok button, stopped and checked the coolant level as ok upper and lower radiator hoses were warm but not too hot to hold. Press OK." A quick glance at gages showed the engine temperature gage bottomed out on cold side, Transmission temp gage in normal range. While driving on 4 lane, light traffic outside temp ~70 degrees a warning light came on saying something to the effect of "Warning excessive engine temperature. Have you checked the DTCs? The CHT is at the back of the PS cylinder head.I have a 2014 F150 4wd 5.0 L with elec 6 speed automatic and factory towing package. If the sensor failed and the PCM thinks the temperature has maximized, the gauge pins and the system goes into limp mode. They do fail and Ford recommends replacing it anytime it is removed. If it does not appear to be a real overheating issue then it is likely a sensor failure. Engine coolant temperature is derived from the CHT signal. I'm guessing its either the Cylinder Head Temp sensor or the Engine Coolant Temp sensor. It has to be a sensor, but which one i dont know. It was still giving me the Engine coolant overtemp and my gauge was still buried in the red. Let it sit over night about 12 hours, came back out and just turned the ignition to the on position. I even popped the coolant resevoir cap and it was fine. I limp it home (about a 1/4 mile) and shut it off. (I leave my truck running usually when i go in to the store quick, I love the keypad) Any how, I get it, my truck is in safe mode, screen reads Engine Coolant Overtemperature and temp gauge is buried in the red. I stopped at the store on my way home from work and came out to my radiator fan running full speed.
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