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confusing Coolant Temperature Sensor problem

 
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Old 12-02-2011, 12:59 PM
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confusing Coolant Temperature Sensor problem

this is on my 91 civic si hatch.

i have 2 coolan temperature sensors. one on the thermostat housing, and one on the side of the block right underneath the distributor.

the problems im having:
my fans are hard wired to run all the time, im get CEL for coolant temperature, and my car doesnt run very good when its cold, takes a while to start, idles bad, ect.

the sensor on the thermostat housing looks a litle messed with BUT the one on the left side of the block is not connected to anything, and there is no loose connector anywhere near it. so im going to need to run new wires to all of it.

so my question is, which sensors go to what? obviously i need them hooked up to the gauge, ecu, and fans.

unless the fans have its own temperature switch. i got all the fan wiring diagrams and it doesnt show location of the fan switch.

and help is appreciated
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Old 12-02-2011, 01:47 PM
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Re: confusing Coolant Temperature Sensor problem

The fan switch is normally a 2 wire sensor, located on the radiator or the thermostat.
The coolant temp sensor is normally a single wire or dual depending on style plug that is located under the dizzy.
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Old 12-05-2011, 02:13 PM
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Re: confusing Coolant Temperature Sensor problem

so my sensor under the dizzy would be for the ecu. makes sense for my idle problem and CEL.

and that would mean that my sensor on the thermostat housing is for fan switch AND gauge?

or is there another sensor somewhere.

someone on another forum said that the fan switch is another sensor right next to the oil filter but i dont info for that anywhere on alldata.

by the way it has a single cam ZC non-v swap
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Old 12-05-2011, 02:33 PM
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Re: confusing Coolant Temperature Sensor problem

Quote:
Originally Posted by Dwend View Post
The fan switch is normally a 2 wire sensor, located on the radiator or the thermostat.
The coolant temp sensor is normally a single wire or dual depending on style plug that is located under the dizzy.
^^^ This is Right
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Old 12-06-2011, 05:27 PM
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Re: confusing Coolant Temperature Sensor problem

so this is what im getting from this info.

my CTS on my thermostat is for the gauge and fans.
so i need to wire the fan motor properly to that CTS.

then the one under dizzy goes to the ECU and only to the ECU.

please let me know if this is wrong.

and some wiring diagrams would help alot if somebody could get some

thanks for all the help
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Old 07-13-2013, 01:54 PM
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Icon10 Re: confusing Coolant Temperature Sensor problem

I'm sure this thread is pretty much dead now since the last post was in 2011, but I'm really happy to have found it. I've had this problem off and on for a long time now. Sometimes my temperature gauge works fine. But, most of the time it quickly goes to red and stays there. It's been so annoying and has made me spend a lot of money unnecessarily due to replacing parts that probably weren't bad.

I took it to the Honda dealer once and they had no idea what the problem was, they were totally clueless and looked at my car like it was some sort of antique that should never have existed. (Plus on a side note, when they jacked my car up, not sure why the jacked it up in the first place, it slipped a little and the control arm on the passenger side slammed into my transmission and cracked it.

Anyway. Again, I'm really thankful to whoever started this forum, I'm going to get this fixed TODAY!
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Old 08-10-2013, 02:43 PM
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Re: confusing Coolant Temperature Sensor problem

Quote:
Originally Posted by jeffpeak View Post
I'm sure this thread is pretty much dead now since the last post was in 2011, but I'm really happy to have found it. I've had this problem off and on for a long time now. Sometimes my temperature gauge works fine. But, most of the time it quickly goes to red and stays there. It's been so annoying and has made me spend a lot of money unnecessarily due to replacing parts that probably weren't bad.

I took it to the Honda dealer once and they had no idea what the problem was, they were totally clueless and looked at my car like it was some sort of antique that should never have existed. (Plus on a side note, when they jacked my car up, not sure why the jacked it up in the first place, it slipped a little and the control arm on the passenger side slammed into my transmission and cracked it.

Anyway. Again, I'm really thankful to whoever started this forum, I'm going to get this fixed TODAY!

I fixed the gauge today, the problem was the ground wire that goes from the neg terminal on the battery to the bottom of the block. It had corroded away. After I fixed this gauge works find.. Solved a few other intermittent electrical issues too.
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