Cbradio and mobile operation

defective TCON board

Check that there are no holes in the float. If the fuel is getting into the float, it will give a false reading. Another thing is to check the ground on the float sensor. If it's not connected tightly, it will create a false reading too.

A VSWR meter is your best bet. They are cheap for cb's . If the antenna is badly mismatched you will get an antenna warning lamp on. If the antenna has a tuning coil you will see usually continuity to ground from the whip. Use the vswr meter on the radio. Set to calibrate first, transmit on channel twenty while rotating the swr cal knob. set needle on orange triangle at top right of scale. Select VSWR mode and transmit. needle should move up slightly if antenna is tuned correctly. Try chaneel 1 and 40 with same procedure. You can tell if antenna is tuned more toward the high or low frequency by how high the needle is on the scale. The higher the reading the worse the match is. If there is always a high scale reading then try another antenna that you know works.Watch for flattened/damaged/water in between braid and jacket or corrosion on coax as this will change the coax impedance drastically

low on coolant - steam going across the sensor instead of coolant will give a false reading. bad temp gauge sensor or a bad gauge and also does it go straight to hot as soon as you start the car when it is cold like first thing in the morning or does it gradually start climbing and will it run hotter or cooler when ac is on or when stopped or going down the road. let me know and give more info hope this helped.

P0117-Engine Coolant Temperature Circuit Low

Possible Causes:

ECT sensor signal circuit is grounded in the wiring harness ECT sensor is damaged or the PCM has failed