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CHT sensor question

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Discussion starter · #21 ·
Well there are some instances where the whole thermostatic relay system needs to be re-wired. it's about $50 parts at an auto parts store. but you should pull the relay and see if you can find someone to test it as i'm not sure how many ohms or amperages it's supposed to put out. the relay is RL-15 and it's gray, in the fuse box under the hood
 
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Discussion starter · #23 ·
Interesting! perhaps I should look into that.. even though my car doesn't really show signs of over heating I never really hear my fans kick on except for when I run the a/c XD

how did you come to this conclusion?
 
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#24 ·
yeh my fans just won't kick in at idle changed relays thermo and resistor pack and they are still not kicking in for me still no conclusion yet until i get a new harness
 
#25 ·
hey guys i have somewhat of the same problem right now with my 2000 se its got a zetec-e in it.

heres what its doing i was sitting at an intersection the other day and all of sudden it started to high idle and then choked and acted like it was gonna die and then went back to normal ran fine for a few mins and then started to high idle again then choked again then went back to normal again the second time around the multi function fail safe heating light came on i just figured it was the thermostat so i replaced but that didn't work i'm wondering if the CHT sensor could cause this problem or is it something else? please help i really don't want to replace this motor if i don't have to

thanks
 
Discussion starter · #26 ·
uhm.. not sure why the fail safe light would come on.. but that is related to engine oil.. check your level..
 
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#27 ·
the fail safe light has nothing to do with engine oil. it only indicates that the car has gone into limp mode. which is caused by overheating or by automatic transmssion problems(if equiped)
 
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#31 ·
are you checking for voltage in the plug from the car or output of the sensor???
 
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#32 ·
yeah i put the volt meter on the plug and i only see 1 volt. I checked the cluster while it was in test mode and it reports -40 which is sayings its not seeing a reading from the sensor. I replaced the sensor already with two diff ones to make sure its not them.
 
#34 ·
I had a pinch in the CHT wire, look for a line or anything else out of the ordinary on the harness side of the pigtail
 
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#35 ·
I dont know what pin # the cht sensor b+ line is at the pcm. but that would be a good place to look as well.
 
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Broke_Two_Foci
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