KZ1

OKay, I did some troubleshooting over the weekend, here is my question.

Does the PFC output of water temp derive itself from the WTRT sensor? or are they independent, ie two different sensors.

THe manual says thermosensor shoudl eb about .29-.36 at 80C, but when my PFC reads 80C water temp the WTRT reades maybe .54. If they are independent which one dooes the PFC rely on. Furthermore, it seems that the temp readout lags behind the WTRT readings. For example, at .54 I was at 78C, and anotehr time I was at .54 at 80C, but then another time, .45 at 80C.

I put my hand on coolant hose from Thremostat housing, it seemed thermostate opened when PFC readout was 75C, which is not good.

THanks Guys, just want to make sure I buy the right sensor.

KZ1

well, I am now even more confused as to where the PFC gets its temp data.

I pulled the water thermosensor, and did the test with hot water. I got infinite resistence at all temps. I installed a new one, and voila, my cars runs at a great 85C in winter, it would never get above 75 before. SO teh water thermosensor was my problem. WHy didn;t the PFC give me an error on that sensor? how did it get a number at all? is it infact using that sensor to gauge or display the WTRT voltage? anyway, car is fixed, but seems a little confusing, I guess there is more to that aspect of the control system than meets the eye. obviously the PFC thought the car was running colder than it actually was, I didn't notice any bad running problems. Now that it is fixed my car runs much leaner, adn so much better. wohoo I can drive it care free again!!!!

cewrx7r1

iTrader: (2)

To test this out, you would have to disconnect both water temp sensors to see which one affects the PFC. The main sensor on the thermostat assembly is used by the ECU for engine control. The sensor near the oil sensor is used for the stock instrument cluster water temp gauge.

Try pulling the other and see what happens.