Daniel Burgess1436215411 Posted November 11, 2012 Report Share Posted November 11, 2012 Hello  I have a g4 storm for my Subaru and ecu mounted in oem location  wanting to set up and oil temp sensor in the sump have had problems with 2 of the sensors I have been trying to use the way it is set up is  an volt 1 with pull up resistor wired into 5v then to pin on sensor 1st was a sensor sold with my link  the calibration table wasn't very close at all and as temperature changed it started to go way off again as I have have an autometer mechanical temp gauge plumed in right next to link sensor in my sump  the calibration table I used was supplied from the link dealer I got it from   I believe this sensor was damaged so replaced with  the second sensor is a vdo sensor 50-150C  323-18ohm  I tried this set up the same way and just the signal wire back to ecu as grounds through sump  and sensor is still out all over the place  the main reason I have the sensor is so I have set a cold temp rpm limit and then also shut it down when it gets to hot  Am I doing something wrong in set up ? does this sensor need the pull up resistor?   the wiring is also been added to over the original loom length so I can get the wiring across top of motor and down past uppipe and under the the rh side of sump Quote Link to comment Share on other sites More sharing options...
Scott Posted November 11, 2012 Report Share Posted November 11, 2012 Hi Daniel, What value pull-up resistor are you using? You can find the reference for wiring an NTC temp sensor in the PCLink help under PCLink Help > Wiring Information > Input Signal Wiring > Analog Inputs > Using voltage channels with NTC sensors. You do need the pull-up resistor if you are using the An Volt channel for a  temp sensor. You need to configure the An Volt channel to GP Temp (Ext Pullup) and then select the Cal table you want to use. You then need to enter the relevant information into the Calibration table. Cheers, Scott Quote Link to comment Share on other sites More sharing options...
Scott Posted November 12, 2012 Report Share Posted November 12, 2012 Hi Daniel, If my math is right your sensor should be reading 475.5 ohms at 0 degrees C. Given the numbers you have I would try the following. I would set the Cal table to start at 0 degrees, and have the table increment in steps of 10 degrees. This will give you zero to 150 degrees. Set the first cell to 476 and the last cell to 18. Select all the cells (use the shift button + arrows), right click and select interpolate horizontal. This will give you the range you require. Cheers, Scott Quote Link to comment Share on other sites More sharing options...
Daniel Burgess1436215411 Posted November 12, 2012 Author Report Share Posted November 12, 2012 is it possible this could be an earthing issue through the sump? its still about 20degrees out at running temp  I had the same problem with the sensor I got with my link Quote Link to comment Share on other sites More sharing options...
Scott Posted November 12, 2012 Report Share Posted November 12, 2012 Hi Daniel, This is a possibility. You could check this by running a GND wire to the body of the sensor from ECU sensor GND and seeing if this improves the situation. Cheers, Scott Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.