P1491 Radiator Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.
That is a fan relay error. Recommend replacing the relay, these jeeps are notorious for burning them up.
The Jeep 302 cubic inch engine 306 error code is a reference to a malfunctioning PCV valve. Replace your PCV valve and the error code should stop.
There are a few reasons for a Jeep error code 121. Some of the causes are a bad connection with the TPS, a corroded sensor, or a harness is rubbing a harness.
Trouble code P0605 means: Internal TCM Error
Code 12 just means that the battery has been recently disconnected
TYPE 43 is the dash type its not a error code of any kind
Trouble code P0302 means:Cylinder 2 misfire detected
Trouble code P0174 means:System too lean (Bank 2)
Error code 66 on a 1997 Jeep Cherokee means TCM to PCM failure. This code means that the transmission control model is not communicating with the powertrain control model.
Check the computer for error code 11. http://www.jedi.com/obiwan/jeep/dtc.html
Engine speed sensor circuit malfuntion
Trouble P1486 means: EVAP Leak Monitor found a pinched hose