Volvo guy

[martin leaf]

hi 

I was wondering if anyone could help on my situation. As far as I'm aware the sensors im using are correct for a link. Ive calibrated my iat sensor and oil pressure to the specs of the sensors correctly as far as I can tell (see attached photos) sorry the iat one is so shit.. But there clearly not working correctly as iat is reading -40 and oil pressure basically 150psi (not started the engine yet) Im confident the wirings correct and when disconnected it reads 0. Ive tried a heat gun on the iat sensor but it made no difference, So I think its either the sensors aren't correct or more likely a calibration error but I cant work out what ive done wrong if I have. I did notice that u can type in decimal places into the table when typing it in, but it just seems to either round up or down when it goes into the table, so does it mean that it doesn't have to be that accurate and its just rounding it up or down, or is it registering it and just not showing it in the table for simplicity and space? If anyone could look at my pictures and tell me what im doing wrong id really appreciate it, as im scratching my head alot at the minute.   

I obviously had to convert bar from the sensor specs to kpa on the oil pressure as theres no bar option for the cali table, but i also changed it to psi and inputted them in psi to see if that changed anything and I got exactly the same readings.

My tps, map and ect are all working/reading correctly btw 

Thanks a lot   

cheers 

[Adamw]

Your IAT cal is out by a factor of 1000.  i.e. those sensors have a resistance of 3457ohms at 20deg C, not 3.457.   But you dont even need to do a custom cal, just set it to Link NTC1-8 & IAT1-8 as it matches that curve.  

The pressure sensor appears to be an absolute pressure sensor so it not really suitable for oil pressure, but if you want to make it work, try something like below (the reason absolute is not ideal is it will only work when barometric pressure is ~100kpa and the oil pressure reading will change with barometric pressure or altitude):

 

[martin leaf]

Your a star mate! That's sorted the iat. I tried the cali 4 for the oil pressure as u showed, dropped it a bit but still reading 1036kpa. I tried it at 100kpa just to see and it dropped it a lot but still not zero. 

So id say I need a different as u suggested, have u any recommendations on a sensor?   

Also while I'm here and u seem like the man to ask. Its a monsoon so only has 2 an temps which I've used for iat and ect, id like to have oil temp aswell, is there a way I can do that, like use a general purpose temp (with pull up) and assign that as oil temp?  

Thanks alot for taking the time to look through and answer my question, much appreciated.  

Cheers 

[Adamw]

Can you attach your tune, cant tell much from photos.  

[martin leaf]

setup link map.pclr

[Adamw]

Your AN V4 input is showing about 4.7V on its pin which is higher than that sensor should output even at max pressure, so you likely have it wired wrong.  

[martin leaf]

Ok ill have a look cheers