IAT Sensor
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 5,786
Likes: 6
From: Lafayette Colorado
Originally Posted by Heretic
Ohms Law, V=IR
All I have is a range of resistance values and corresponding temperature values for the sensor. I need some way to equate the resistance values to volts. Once I have that conversion, I can equate the volts coming from the sensor to temperature values.Keith
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Keith, if you have a good meter you can put a +5V reference on one side of the sensor and then heat or cool it to a known temperature and measure the voltage at the othe terminal. Do that for the points of reference you require and you can interpolate the points in between. Basically, you need to reverse engineer the temperature coefficient of the thermistor. Not an easy task, but doable with the right tools.
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Also, according to the diagnostics, when the car is completely cold, you can check the accuracy of the coolant and IAT sensors against each other. They should agree within 3 deg. F of each other.
