Outer Limits 4x4 Board

Posted: **Tue Jun 09, 2009 5:39 pm**

hey
does anyone no how to test if my coolant temp sensor is working correctly.
i'm talkin bout the one that goes to the ecu.

EDIT:name change, formerly - coolant temp sensor

Posted: **Tue Jun 09, 2009 8:33 pm**

you need to find out weither it is a negative tempriture coefficent or a positive tempriture coeffficent (sorry bout the spelling) and the find out the resistanceses it should have cold and then heat it up and c if it changes in the right direction

Posted: **Tue Jun 09, 2009 8:35 pm**

i found the resistances just b4 i just don't understand the other bit

Posted: **Tue Jun 09, 2009 8:39 pm**

u need to find out weather the resistance goes higher our lower as the tempriture goes up

Posted: **Tue Jun 09, 2009 8:41 pm**

is this wat you mean.

Posted: **Tue Jun 09, 2009 9:48 pm**

Yep, that's exactly it....
You need a multimeter, an accurate thermometer, a sauce and some water...
Pop the saucepan on the stove, put about 5 cm of water in the saucepan, Connect one lead from the multimeter to the terminal on the CTS and the other either to the second terminal (if it has two) or the body of the sensor.

pop the thermometer in the water check the water temp against the resistance, turn the stove on and check the sensor throughout the temperature range given on the chart.

P.S. It's not very often that a sensor is faulty.

Good luck
Dan

Posted: **Wed Jun 10, 2009 8:20 am**

Make sure you suspend the sensor in the water, if it touches the actual container you will get surface transmisson and it will not be acurate. Just like testing a thermostat.

Layto....

Posted: **Wed Jun 10, 2009 7:05 pm**

i did it in the engine today and it was all very close to the correct numbers, as i have a accurate temp gauge in the car. but i found out that the fuel pressure regulator is leaking a fair bit through the vacuum hose so thats the problem.

so does anyone no where i can get a new one from. cause my sierra is runnin really rich atm.

Posted: **Wed Jun 10, 2009 8:51 pm**

If youre just after vaccuum hose, just take in a sample to Repco, Bursons, etc... they have it.

Posted: **Wed Jun 10, 2009 9:40 pm**

nah its leaking fuel through the regulator. i need a new regulator

Posted: **Wed Jun 10, 2009 11:21 pm**

Not sure if a place like Repco would have them then, best bet is genuine, or do a search online. Failing that, a wreckers.

Posted: **Thu Jun 11, 2009 5:22 pm**

looked around the wreckers and they didnt wanna sell parts off the engine and repco had nuttin, havnt had a look at genuine yet