Coolant temp sensor

[goldnsx]

The EU version seems to have a different coolant temp sensor for the ECU. The US version doesn't fit in size AND Ohm values.

[Kaz-kzukNA1]

Hi, goldnsx.
There is no difference in the TW sensor (coolant temperature sensor used for EFI software) between different country spec so you either got the wrong parts or used the wrong parts no.

Not sure which one you are after so please refer to the following info.


https://lh3.googleusercontent.com/-waPWtrrf8cs/VnxTQwOVb4I/AAAAAAAAdLk/X5K2o_qkWSw/s800-Ic42/Sensor01.jpg

https://lh3.googleusercontent.com/-dM64X2Ely_s/VnxTN55SzaI/AAAAAAAAdLc/215VSCGDbz0/s800-Ic42/RadFanControlSensor02.jpg
There are 3 coolant temperature sensors on our NSX.

[Kaz-kzukNA1]

https://lh3.googleusercontent.com/-t2zUAZVhv-U/VnxTLYRqfmI/AAAAAAAAdLU/g5d2vobd5fU/s800-Ic42/RadFanControlSensor01.jpg
37760-PH7-003: Rad fan control sensor, BROWN one in your photo and mounted on the thermostat cover under the TH body.
Used for triggering the rad fan and fan speed control.




https://lh3.googleusercontent.com/-m-e4LCtNdA0/VnxTSrqegKI/AAAAAAAAdLs/pWrvFKW6vnM/s800-Ic42/TWsensor.jpg
37870-PJ7-003: TW sensor, BLACK one in your photo and at the base, you will see rubber sleeve. This is mounted on the cyl head and you can find it below the EGR valve.
Used for ECU EFI software.



https://lh3.googleusercontent.com/-9ZDDgOZ92Rc/VnxTHYWI0mI/AAAAAAAAdLE/7hcnyH1I_Ys/s800-Ic42/TempSender_001.jpg

https://lh3.googleusercontent.com/-L_mVeJg9Lic/VnxTJIvDynI/AAAAAAAAdLM/kUPs-yVWJNg/s800-Ic42/TempSender_002.jpg
37750-PH2-014: Thermo unit, temperature sender unit, BRASS colour, mounted on the water passage behind/side of the TH body.
This is the one for the temperature gauge on the dash.

Kaz

[goldnsx]

Hi Kaz

Thanks very much for the pictures. The service manual was not very clear here (or I was going the shortest way...). I've mistaken the rad fan control sensor for the TW sensor. I was reading higher values of resistance and thought it was bad. In the US they had a TW sensor going bad over time quite frequently. As my car was running a little bit rough at low revs during warm-up. So this was my first suspicion.

Thanks again and Merry Christmas!