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    #1

    Sensor question

    What's the importance of the sensor on the water neck coming off of the head on the front (radiator side) of the engine? I know JDM motors don't have it... and usdm motors have it... hence why you have to switch the neck with the pre-drilled and tapped hole from your old motor...

    Would the absence of this sensor using a USDM ECU and a JDM harness cause a CEL or any adverse effects?
    RIP Lifsatrip7

    ...
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    #2
    If you are talking about the H22 swap into our 4th gen series, you don't use the JDM harness. You use your USDM F22 wiring harness. The H22 harness has no play in an engine swap so you should be fine with teh USDM ECU and the JDM engine since you are using the USDM harness.
    Adam - Retired OG member from '03
    2010 Lexus IS-F : Starfire Pearl
    2009 Yamaha R1 Raven : Black on Black
    2002 Lexus IS300 : Crystal White Pearl / Black Leather



    .. i HAD more shaved on my accord than your girl does on her entire body..

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      #3
      Originally posted by rebels
      If you are talking about the H22 swap into our 4th gen series, you don't use the JDM harness. You use your USDM F22 wiring harness. The H22 harness has no play in an engine swap so you should be fine with teh USDM ECU and the JDM engine since you are using the USDM harness.
      It's not an H22...

      I knew someone would say something about the harness...

      I just need to know if anyone has tried not using that sensor...
      Last edited by ZigenBallZ; 06-19-2004, 08:45 PM.
      RIP Lifsatrip7

      ...

      Comment

        #4
        Originally posted by ZigenBallZ
        It's not an H22...

        I knew someone would say something about the harness...

        I just need to know if anyone has tried not using that sensor...

        Well if you cut the sensor off, or not use it, I think you will get a CEL because it's just like when you're wiring up an H22 or whatever and don't have something connected correctly, it throwss a code at you.

        I'm sure there's a way to go around it, but overall I think you will get teh CEL because it will detect the not used sensor.

        Who's lifeatrip in your sig? Just curious.
        Adam - Retired OG member from '03
        2010 Lexus IS-F : Starfire Pearl
        2009 Yamaha R1 Raven : Black on Black
        2002 Lexus IS300 : Crystal White Pearl / Black Leather



        .. i HAD more shaved on my accord than your girl does on her entire body..

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          #5
          nevermind... found the answer by searching...

          Turns out it's NOT a neccesary sensor...

          Just took a few tries to get the right combination of search words...
          Last edited by ZigenBallZ; 06-19-2004, 10:23 PM.
          RIP Lifsatrip7

          ...

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            #6
            So anyways...

            It's an F20A CB3 harness... the only difference between that harness and the usdm LX harness is that one plug...well and the IAB wiring...

            I think I had some loose connectors coupled with a bunk PT6...

            Gonna try and stick with the JDM harness...and if any issues arise from the lack of that sensor.. I'm blaming fizzbob and bustedlx... since they were the ones who said it wasn't needed in an old thread...
            RIP Lifsatrip7

            ...

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              #7
              i never swapped water necks, so i dont have that sensor connected. figured my ECU never needed it there in the first place (while the motor/ecu were in a lude) so i figured it wouldnt care if it wasnt hooked up now. never had any problems because of it.


              - 1993 Accord LX - White sedan (sold)
              - 1993 Accord EX - White sedan (wrecked)
              - 1991 Accord EX - White sedan (sold)
              - 1990 Accord EX - Grey sedan (sold)
              - 1993 Accord EX - White sedan (sold)
              - 1992 Accord EX - White coupe (sold)
              - 1993 Accord EX - Grey coupe (stolen)
              - 1993 Accord SE - Gold coupe (sold)
              Current cars:
              - 2005 Subaru Legacy GT Wagon - Daily driver
              - 2004 Chevrolet Express AWD - Camper conversion

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                #8
                The sensor in question is actually the "Underhood Temperature Sensor". It's what turns on your fans after you shut off the engine, if the engine is still too warm. It will not throw a code, but the fans will not come on under these circumstances.
                Visit us at http://www.valleyspecialists.com for all of your Honda and Acura service needs!

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                  #9
                  But does the P13 even have this function? Since swapping my fans have never come on after turning off the engine. I have a USDM P13 to.

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                    #10
                    I'm pretty certian that it is a redondant sensor. For example the first coolant temp sensor is set for 180 degrees to turn the fans on but if it doesn't because of some failure this sensor is set for 200 and then the fan kicks on. Know what I mean?

                    In any event if you don't use it nothing is affected. I haven't been running mine since I dropped my H22 in.
                    My unupdate website Speedworx-online.com, lol. <click here>.

                    Comment

                      #11
                      Originally posted by BustedLX
                      I'm pretty certian that it is a redondant sensor. For example the first coolant temp sensor is set for 180 degrees to turn the fans on but if it doesn't because of some failure this sensor is set for 200 and then the fan kicks on. Know what I mean?

                      In any event if you don't use it nothing is affected. I haven't been running mine since I dropped my H22 in.
                      Gotcha. I just find it odd the fans used to come on with the F22 but they don't with the H. Seems to me it should be the other way around.

                      Hell, what do I know

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                        #12
                        Interesting to see most of you got rid of yours. I kept mine and just switched necks w/ the f22.

                        mmmmmmmmmmmmmm....... DOHC

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