GM Style IAT Sensor

[Chambers]

So,

I have been battling with my GM style IAT sensor (photo attached), I'm curious. Does the .def file included with the DET3 software only work with the IAT sold on ecumasters.com?

When I have my sensor installed I see 4.980 volts, when I disconnect it I see 0.0 volts (go figure). The resistance tested out ok ~3.5K at 20deg C. I used a heat gun lightly and the voltage went up slightly to 4.950 volts. My only thought is its the wrong sensor. I have swapped it with another of the same type and got the same results.

Wiring is direct to the DET3 for testing, pin 12 for 5v, and pin 16 analog input 4.

Can anyone confirm my findings?

Thanks


***UPDATE***
Solved:

Using the attached image in the FIT manual, I ended up using a 4.7K resistor to reach a reasonable tolerance of the ambient temperature during testing (approximately 20.5 degC.), this resistor value may differ on other setups and with other wiring routes.

Ultimately I used the 5v reference from the factory ECU with the 4.7K resistor inline to the temp sensor, then using the "signal" wire from the factory harness I re-routed that to the DET3. I also utilized the factory "sensor ground" for the IAT. Also, a resistor was added for the factory IAT sensor circuit so the factory ECU would not fault out into limp mode.

The moral here is read to BOTH of the manuals and read them thoroughly haha!

[ihiryu]

Are you using GM TEMP or GM 110KP?

[Chambers]

I'm using GM Temp

[ihiryu]

That's what I'm using and it seems to be fine, faulty IAT?

[Chambers]

I swapped it out with a new unit, same result. I just got an order in for the ECUM IAT sensor, so I'm going to hook that sensor up and see if it reads correctly. The last thing I can try is swapping out my DET3 with another unit.

[Chambers]

I just put the ECUM IAT sensor in and I got the same results... Can you upload your .def file?

[ihiryu]

I just used the one in the software. I'm actually using the same one as yours. You sure it's not the wiring at all? I would try to move the analog input and see what it does.

[Chambers]

The wiring for the IAT is sound. I swapped out the DET3 with another unit and got the same results so it has to be something external, either the .def file or other wiring/other sensors.

I will try swapping the IAT with another input, if that works then the challenge will be in FI mode, as the inputs are not interchangeable...

[ihiryu]

[QUOTE=sheedy126;2058965]I was running speed density (no afm) but I did not have the table setup for the gm iat. I added a resistor I believe it was the 2.2k, between the factory temp sensor on the afm.
Then you just wire up to whatever extra input on the det3, other to ground on det3. The wires are not polar. After that's all hooked up you should be able to load the gm scale, then assign the correction for the input you're using in the table setup menu iirc.
It's been awhile since I looked at the software I believe I have a picture of the setup on my laptop


Sent from my LG-LS980 using Tapatalk[/QUOTE]


This is what I got from this fella over on SM in the piggyback forum (which is pretty dead). So he's using a resistor to trick the stock AFM, and for some reason he has the DET3 input to one side of the GM MAP sensor, and the other side to GROUND. Which is NOT how I have it.

[Chambers]

With some input from Zach I was able to figure out I was referencing the wrong setup procedure. I was able to get the sensor to read correctly by using a 4.7k resistor on the 5v supply. I tested a few other resistor values but the 4.7k was the closest to the ambient temperature when tested.

I'm now dealing with the next steps of going FI. I will update my setting in the first post!

[ihiryu]

Okay, so I'm confused.

So instead of using the 5v from the DET3, you took it from the stock ECU?

So Factory ECU -> 4.7 Resistor -> IAT (Pin 1)
DET3 Analog -> Factory wiring -> IAT (Pin 2)

[Chambers]

For testing I used the DET3 5V reference, once I had the correct resistor selected I double checked where the sensor would be installed utilizing the harness wiring and ECU 5V ref. It had a slight voltage drop from the extra length of wiring but was so close I felt it was good. The attached wiring diagram shows the layout, the resistors are the pill looking symbols.

[flubyux2]

Hey what pins are you guys connecting the external iat to on the det3 harness?

[ihiryu]

Pin 5?

[Alonzoszef]

I have the 6.1 chip. Can I install the factory IAT sensor in my up pipe to log intake air temps on my PL or does it need to stay in front of MAF to make chip work correct? If I can move it will it set a CEL if temps get high? Thanks

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