hi.do i have to take the alternator off to replace the coolant temp sensor/sender on my 2001 5.4 harleyf150 w/o sc

 

No. Here's a little different set up, but the sensor is in the same place - between the the two sets of blue wires in the picture, and adjacent to the #1 cyl fuel injector.

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hmm mine was on the drivers side, but you dont have to take anything off.

 

hi ,i found the sensor on the drivers side behind the alternator.i have the 5.4 v8.many thanks for your advice.darren

 

Your '01 truck has no coolant temp sensor. It was deleted in '99. That's the Cylinder Head Temp (CHT) sensor. What's the symptom you're trying to fix?

 

hi mate .found it behind alternator on drivers side.thanks darren

 

hi steve ,bare with me as im no mechanic.i have codes that say both banks are lean.i had checks done for vac leaks ,iv changed pvc.a friend of mine put it on dianostics and wasnt happy with the temp readings .they were fluctuating from -40 then to 200c then back down to 30 c and so on.so he said that maybe the sensor is telling the fuel injection the wrong info this is the reason for changing it.im in the uk do you call it a temp sender.thanks darren

 

The cylinder head temperature sender does the same thing as a coolent temperature sensor. The cylinder head temperature sensor is a dry sensor and it infers a coolent temperature to the computer which in turn operates the gauge on the dash. So if you are getting wild swings in the inferred temperature you could have a bad sensor or possibly you may have to check the wiring and connectors if the sensor does not help. There should be two wires on the sensor the grey wire with the red tracer goes through a second connector and then is grounded. the other wire should be yellow with a light green tracer and goes through two connectors and ends at pin 66 at the computer connection behind the battery area. You should be able to easily trace these wires If you use an ohm meter the grey/red should be close to 0 ohms as it is the ground. Hope this helps some.

 

d4
Yes, it's A temperature sensor - it's just not a COOLANT temp sensor. I'd suspect a wiring fault first. CHT sensors don't go bad very often.

chuck
The CHT doesn't really do the same thing as the ECT - if it did, Ford wouldn't have bothered changing.

Here's the ECT transform:


Here's the CHT (it's for a switching EEC, so just compare the cold end values):
.

Those captions explain a lot more about what the CHT is used for.