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my 1999 SVT had its Engine Coolant Temperature (ECT)sensor changed (the one that faces the fire wall with two wires, the one that sends the signal to the computer - the Collant Temperature Gauge sender with one wire seems to work fine).
So even though there is a new ECT sensor and the computer has been reset the code continues to come up. The wires look ok.
So far the other causes I've seen by searching the p0118 code is that the computer is bad in the car or the new sensor is bad. Any other ideas? I don't have a sensor to test the ECT sensor suppose I could ask the mechanic to double check.
The mechanic had said something about having Ford remap or reflash the computer. The Ford mechanic went round and round on that one.
Oh yea, the fan comes on within a minute after the car has been turned on and stays on at high speed.
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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
-sensor signal short to power
-damaged PCM
-improper harness connector
-damaged sensor
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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.
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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?
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No I don't have any of those meters. But after reading your post and thinking some more I went back out and started following the wires again. What I had not done before was unplug the harnesses (?) (there are a group of 3 harness pairs just before the PCM). I blew into them and pluged them back together. Didn't really look like any dirt in there and because they all had looked fairly clean and secure I never took them apart before.
Well I start the car and the fan doesn't go on within a minute. Fan doesn't go on and the gauge actually moves more slowly up to the middle area where it normally resides.
I took the negative off the battery, waited a minute and put it back on. And the check engine light after driving has been off, it has not come on after driving around, stopping and restarting.
So I think that has done it. Amazing the mechanic told me the PCM needed to be remapped or flashed because he changed out the Oxygen Sensors and the ECT and the codes didn't go away. He said the PCM got used to new parameters.
Ford Dealer as I said wanted to run for 3 hours and had a different opinion.
I found out the Oxygen Sensors were missing Fuse #13 the 20 amp fuse in the box. That solved that. And now if this fixes the ECT it seems like the obvious is ignored?
Mechanic swore the sensors were bad, it made sense because the person I bought the car from had put in a new engine when the old one seized and never tried to get the check engine light off, So I figured he had ruined the oxygen sensors and the coolant sensor if the engine overheated.
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Good job! Now, get a meter before the next problem crops up. 
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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