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  #1  
Old 04-29-2010, 04:28 PM
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Default engine temperature sensor

I recently had a scanner on my truck and it gave me an engine temp sensor fault. There are 2 of them... one goes to the computer, one goes to the temp gauge. does anyone know whick one is which? It's an '02 with a 4L
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  #2  
Old 04-29-2010, 04:32 PM
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Default Re: engine temperature sensor

What are the codes?
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  #3  
Old 04-29-2010, 04:48 PM
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Default Re: engine temperature sensor

It was my brother's scanner. It said engine temp sensor self test not working. I got surging idle and it stalls if it idles too long. The scanner says both banks are lean. If the temp sensor isn't working the computer may be making it run lean. There are 2 temp sensors side by side but I don't know which one to replace... way to much shit goin on under the hood to follow the wires
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  #4  
Old 04-29-2010, 05:06 PM
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Default Re: engine temperature sensor

Quote:
Originally Posted by tofr3b View Post
It was my brother's scanner. It said engine temp sensor self test not working. I got surging idle and it stalls if it idles too long. The scanner says both banks are lean. If the temp sensor isn't working the computer may be making it run lean. There are 2 temp sensors side by side but I don't know which one to replace... way to much shit goin on under the hood to follow the wires
Clean your MAF, that may help with the surging. I'll go look some stuff up and get back to you, what is the code though? Like P---- or what ever it is
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Quote:
Originally Posted by aaron_ariens View Post
I think Henry just shit himself
Quote:
Originally Posted by Radness View Post
Its kind of like that carnival game "Whack A Mole" but with guns! Haha
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  #5  
Old 04-29-2010, 05:11 PM
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Default Re: engine temperature sensor

Thanks for the tip. I'm not sure if ther was an actual code or not. My brother wa using the scanner and he just read off the eng. temp. self test not working
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  #6  
Old 04-29-2010, 05:13 PM
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Default Re: engine temperature sensor

That will register as a code. The other thing is you may not have driven the vehicle long enough for it to get all the proper parameters tested in the PCM
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Truck built in loving memory of Norm Howard
Outcast Racing
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Quote:
Originally Posted by aaron_ariens View Post
I think Henry just shit himself
Quote:
Originally Posted by Radness View Post
Its kind of like that carnival game "Whack A Mole" but with guns! Haha
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  #7  
Old 04-29-2010, 05:59 PM
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Default Re: engine temperature sensor

Replace the sensor. The difference is:

-Sending unit (goes the the gauge) has only one wire.
-Sensor (goes to the computer) has two or three wires.

Since the sensor gives the computer info on the air/fuel mixture, I would fix that before I did anything else. Cleaning the MAF is always a good idea though.
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  #8  
Old 04-30-2010, 04:58 AM
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Default Re: engine temperature sensor

Quote:
-Sending unit (goes the the gauge) has only one wire.
The gauge sending unit may have either one or two wires depending on year and engine. His 2002 4.0L has two wires to each ECT connector.

ECT (PCM sensor): Light green/red and gray/red
ECT (gauge sending unit): red/white and black/white
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  #9  
Old 01-10-2011, 08:06 AM
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Default Re: engine temperature sensor

I have a 2001 4.0L six with a P1116 engine coolant temp sensor self test out of range. The dash gauge reads in the middle. Is this due to faulty gauge?

Where is the gauge located?
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  #10  
Old 01-10-2011, 09:09 AM
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Default Re: engine temperature sensor

Quote:
Originally Posted by RobW View Post
I have a 2001 4.0L six with a P1116 engine coolant temp sensor self test out of range. The dash gauge reads in the middle. Is this due to faulty gauge?

Where is the gauge located?
The gauge and the PCM use two different independent sensors. The code is related to the PCM sensor and has nothing to do with the gauge.
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BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
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Keypad Entry, Lock LEDs, ABS switch, sway bar discos
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  #11  
Old 01-11-2011, 06:50 PM
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Default Re: engine temperature sensor

Quote:
Originally Posted by rwenzing View Post
The gauge and the PCM use two different independent sensors. The code is related to the PCM sensor and has nothing to do with the gauge.
Not sure that I understand. Are you saying that code P1116 is for a faulty PCM (powertrain control module)? The references that I find say that the engine temp sensor is failing it's self-test. Wouldn't this mean that the sensor should be replaced?

I appreciate your answer. I have purchased a replacement sensor, but if I need to look elsewhere, I'd rather take the sensor back than have blown that $20 and need to spend more time/money elsewhere. Thanks.
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  #12  
Old 01-11-2011, 06:53 PM
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Default Re: engine temperature sensor

just replace them both. its easier
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  #13  
Old 01-11-2011, 07:24 PM
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Default Re: engine temperature sensor

The Coolant Temperature Sender (usually black or brown) lights up the idiot light or the water temp gauge..
The CTS coolant temperature sensor send signals to the ECU (computer) is (usually Grey)
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