Originally posted by Fordowner:
thanks, I wrote some of my attempts to interpret below, is this correct? Hope these questions aren't to obvious, I've been reading and often see these terms but not really sure excatly what they mean.
Thanks

Originally posted by HITMANinMI:
P0118 Engine Coolant Temperature circuit High Input.

It means the signal is greater than the max., the max is 4.6 volts.

Causes
-open circuit in harness
Does this mean something like bad wiring but in the connectors or the PCM?

-sensor signal short to power
Does this mean bad wiring?

-damaged PCM
If it is this then that would require a new PCM? or just a reflash/remap? My mechanic said only Ford can do this. The one Ford dealer said they have to hook it up for 3 hours and then who knows - so I didn't want to do this.

-improper harness connector
Does this mean the plastic connection of the wires from the ECT sensor to the wire that runs to the PCM? I looked at it visually and it appears fine.

-damaged sensor
This would be a replacement of the ECT sensor, which for now I'm betting is not the cause as it is a new ECT sensor, though I understand new ones are sometimes bad.







First off where did you buy your sensor from? I use only Motorcraft parts, reason is they are made the exact same way the ones that came on the cars were made.

Secondly I highly doubt it is a damaged PCM, that was on the list so I just typed it up there. If your PCM was damaged you would have a truckload of problems.

I would first make sure your ECT is plugged in completey before doing anything else.

Do you have a multimeter by chance to test voltage?