P0118 code, but temp gauge works fine
08-02-2012, 03:24 AM
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P0118 code, but temp gauge works fine
I have a 1996 Civic that is repeatedly throwing code P0118 Engine Coolant Temperature (ECT) sensor circuit high input shortly after starting the car. But the temperature gauge works fine.
This started after I had the transmission (manual) changed so I suspect something did not get reconnected, but the mechanic cannot find anything.
This was also the first time using this mechanic (chain) since the one I went too since I was a teenager went out of business.
Any thoughts on exactly where to look when you get a P0118 but the gauge is still working fine?
Thanks
This started after I had the transmission (manual) changed so I suspect something did not get reconnected, but the mechanic cannot find anything.
This was also the first time using this mechanic (chain) since the one I went too since I was a teenager went out of business.
Any thoughts on exactly where to look when you get a P0118 but the gauge is still working fine?
Thanks
08-02-2012, 05:24 AM
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Technical Hero
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Re: P0118 code, but guage works fine
The gauge has nothing to do with it. This is the ECT and testing:
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/ect-o2-running-rich%3Dbad-mpg-2618622/
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/ect-o2-running-rich%3Dbad-mpg-2618622/
08-02-2012, 06:48 AM
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Re: P0118 code, but guage works fine
As Hero says, the temp gauge in the cluster uses a different temp sensor -- the 1-wire sending unit under the distributor.
The 2-wire temp sensor (ECT sensor) under the distributor is the one you need to focus on.
The 2-wire temp sensor (ECT sensor) under the distributor is the one you need to focus on.
08-05-2012, 09:18 AM
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Re: P0118 code, but guage works fine
Thank you both for your replies, today was the first day I had to look at it.
Following your instructions found the ECT under the distributor.
Anyways tested the ECT with OHM meter, 1699 cold, and in range of 200-400 when warmed up. So it is good.
Tested the voltage as indicated, red/wht >> grnd = 5v, red/wht >> grn/wht = 5v. From there the diagnostic page in the link says to substitute with a known good ECU, which I do not have.
Would there be anything else I can try other than going to a dealer?
P.S. I already changed the coolant and bled the system as a post somewhere had said dirty/low coolant could contribute to a PO118 code.
Following your instructions found the ECT under the distributor.
Anyways tested the ECT with OHM meter, 1699 cold, and in range of 200-400 when warmed up. So it is good.
Tested the voltage as indicated, red/wht >> grnd = 5v, red/wht >> grn/wht = 5v. From there the diagnostic page in the link says to substitute with a known good ECU, which I do not have.
Would there be anything else I can try other than going to a dealer?
P.S. I already changed the coolant and bled the system as a post somewhere had said dirty/low coolant could contribute to a PO118 code.
08-25-2012, 02:42 AM
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Re: P0118 code, but temp gauge works fine
this is the kids car and I hadn't gotten to try resetting the ECM yet, but the check engine light went back off on it's own now. Nothing changed that I am aware of other than the weather has gotten cooler and more seasonable.
So the light is off and I am just going to hope it stays off. If it comes back on I
will try resetting the ECM.
Thanks again for you help.
So the light is off and I am just going to hope it stays off. If it comes back on I
will try resetting the ECM.Thanks again for you help.
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