MSefi.com read only forum (Jan.15,2018)

Just for full disclosure, these are the mods done for the sink-to-ground hall sensor (works great):

Replaced D1 & D2 with jumpers
Removed C12 and C30
Removed jumper from XG1 and XG2
Removed jumper from JP1
Connected XG1 to JP1-pin2
Connected +5v from proto pad to JP1-pin3

yup, sure do. 100C and 39C when shorted.

temp does fluctuate with the sensor attached - it's just way off. i've tried the gm sensors as well as a few other sensors i had laying around (after measuring/calibrating them in tunerstudio) with the same results.

i'm really confused at this point.

Hmmm. With both sensors unplugged, I get 100C for coolant and 39C for air. I pulled the leads from the relay block, so it's jut the cable connected to the relay with nothing else connected, and I still get 100C and 39C. JUST to be sure, I reflashed again and re-ran the thermistor calculation tool ...

Could you post exactly what values you've used for the calibration, including bias resistor values?

Sure. Bias resistors on the board are both marked 2491.

In tunerstudio, I'm using the standard GM sensor setup:

Bias resistor value: 2490
-40C 100700 ohms
30C 2238 ohms
99C 177 ohms

and I did ...

I forgot to add that I have verified that both CLT and IAT terminals also show voltage consistent with vref (4.93v), and I've checked continuity in the relay cable (as well as a visual of the ends under the shields).

Hi,

I'm banging my head against the wall trying to get my temp sensors working correctly.

I am working on a conversion using a 3.57 board/msii/2.89 with the relay board and cable from DIYAutoTune.. I was originally going to use my stock bosch sensor for CLT and a Pontiac Sunfire sensor for IAT, so ...