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Old 10-15-2011, 08:15 PM   #1
rideAC1
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Default CEL P0118...how to fix?

Yes, I've searched this website and the internet for the answer but haven't been successful yet.

So I just got done putting my intake manifold back on my 2002 WRX after removing the TGV's and doing a couple other little things, and once it got started up it is throwing the P0118 coolant temp circuit high input CEL. I've searched all afternoon for a fix but nothing serious came up. I refilled my coolant after the intake mani and everything was put back on. Is it possible to have an air bubble in the coolant system to cause this code? I've checked the connection to the sensor which from searching I believe to be one of the 3 small connections just behind the water pump and alternator onto the block. I unplugged and plugged them back in and rechecked the code with my Accessport and the 0118 is still coming up. Also, my water temp gauge (oem) is flatlined...which I'm sure is related to the sensor or wire being disconnected.
Is the location I mentioned correct as to the location of this water temp sensor? Is there another connection to this sensor to check some place else?
I drove the car around for like 5 min to see if the coolant could be "stirred up" from getting it warmed up and moving, but no luck.
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Old 10-15-2011, 08:36 PM   #2
Wile
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Something similar happened to my Brother-in-law.

Can't remember what he did.

I'll call him.
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Old 10-15-2011, 09:44 PM   #3
toconn
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Have you reset the ECU again after any of these attempted fixes?
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Old 10-15-2011, 10:27 PM   #4
rideAC1
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Quote:
Originally Posted by toconn View Post
Have you reset the ECU again after any of these attempted fixes?
Yes. The CEL still occurs after a ECU reset.

The cooling fans run constantly too with this CEL.

No fun.
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Old 10-16-2011, 02:13 AM   #5
PlasticFoamMan
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http://www.rs25.com/forums/f72/t1368...input-ect.html

This may help. Sounds like it may have been disconnected or now a loose connection as you put everything back together (gc fwiw but I'm sure things haven't changed much).
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Old 10-16-2011, 09:18 AM   #6
CosmoTheCat
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Quote:
I believe to be one of the 3 small connections just behind the water pump and alternator onto the block.
I'm pretty sure it's not in the block, but rather in the coolant crossover pipe between the block and intake manifold. Look for a brown connector iirc.
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Old 10-16-2011, 04:23 PM   #7
rlloft84
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The p0118 is coolant temp. Sensor signal high. Sometimes its low coolant... in my experience it usually a sensor.
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Old 10-16-2011, 04:25 PM   #8
rlloft84
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..Sry..or connection
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Old 10-16-2011, 05:48 PM   #9
rideAC1
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Thanks everyone for the help. It was the connection of the wire harness to the sensor on the crossover pipe...I simply didn't connect it when I put the intake manifold back on. It's a super pain to get to and not noticeable to realize it was even disconnected; I had to take off the sensor, wires, and hoses that are between the water pump and the alternator in order to even attempt to see the coolant sensor...and it's a nice little spot to try and get your hand in there to put the triangular plug back on.
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Old 10-16-2011, 06:58 PM   #10
CosmoTheCat
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Yup, that's a bugger of a sensor to forget once you get it all put back together.
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