[nviym]

hi im in need of some help and cant seem to find the answers. So i have this engine code P0236 that wont go away. I think i know exactly how to fix it but i dont know the correct order for the wiring of this connector. I’ve tried looking it up and no one on facebook seems to know either so here i am. Its the IAT female connector that i need the correct wiring order for. Any help would be greatly appreciated even a picture of the connector would help Thanks in advance 🙏🏿.

[ctrlz]

Looks like you have some non-stock rigging there.

This is from the repair manual.
For the 2.0 it describes "Turbocharger boost/intake air temperature sensor" located "top of intake manifold."
wire number and color:
1) blk/vio (which I assume is black with violet stripe)
2) wht/blu
3) gry/red
4) vio/blu

[nviym]

Thanks for the help again i switched the wires around and its giving me a P0238 code now and putting the car in limp mode with this message now

[ctrlz]

Forum was down, so I could not update my post.
The sensor is dual air temp/air pressure sensor.

Pins are +5V, low ref (gnd), air temp signal, and air pressure signal.

I have the exact pin numbers for the sensor and the corresponding pin where they hook up to the ECM.
Here's what I see in the repair manual:
Format is sensor pin #; wire color; another # (intermediate connector?); ECM pin #; function
1; blk/vio; 5; 30; low ref
2; wht/blu; 6; 47; temp sig
3; gry/red; 4; 14; 5 V ref
4; vio/blu; 3; 46; pressure sig

That P0238 is boost pressure high. I bet you have some of the pins/connectors wired wrong.

[nviym]

Originally Posted by ctrlz

Forum was down, so I could not update my post.
The sensor is dual air temp/air pressure sensor.

Pins are +5V, low ref (gnd), air temp signal, and air pressure signal.

I have the exact pin numbers for the sensor and the corresponding pin where they hook up to the ECM.
Here's what I see in the repair manual:
Format is sensor pin #; wire color; another # (intermediate connector?); ECM pin #; function
1; blk/vio; 5; 30; low ref
2; wht/blu; 6; 47; temp sig
3; gry/red; 4; 14; 5 V ref
4; vio/blu; 3; 46; pressure sig

That P0238 is boost pressure high. I bet you have some of the pins/connectors wired wrong.

i connected them in that order and i still keep getting the P0236 and P0238 codes and i tried wiring them the opposite way same order and im still getting the same results could it be the sensor is bad ?

[ctrlz]

Originally Posted by nviym

i connected them in that order and i still keep getting the P0236 and P0238 codes and i tried wiring them the opposite way same order and im still getting the same results could it be the sensor is bad ?

You could check continuity back to the ecm pins if possible.
Also you could check resistance across the two sensors. Looks like the temp side might be good.
What is exact part number for the sensor? These are typically about $30 from what I can see. Might be worth just trying a new one if you are sure wiring is correct.

[nviym]

Originally Posted by ctrlz

You could check continuity back to the ecm pins if possible.
Also you could check resistance across the two sensors. Looks like the temp side might be good.
What is exact part number for the sensor? These are typically about $30 from what I can see. Might be worth just trying a new one if you are sure wiring is correct.

The part number is PT3790 its an ACDelco connector off RockAuto for 25 bucks. Ill try a new sensor because i have one and if that doesnt work im just going to buy another connector.

[ctrlz]

Originally Posted by nviym

The part number is PT3790 its an ACDelco connector off RockAuto for 25 bucks. Ill try a new sensor because i have one and if that doesnt work im just going to buy another connector.

PT3790 is connector.
What is the part number on the sensor?

[nviym]

Originally Posted by ctrlz

PT3790 is connector.
What is the part number on the sensor?

This is all thats on the new sensor i got. Is there a pic that you can upload for the wire connections so i can see the correct order ?

[ctrlz]

That seems to be an aftermarket part number modeled after a Bosch sensor. Probably ac Delco has their own number too. Anyway the pin order starts with 1 on the side of the hole for the mounting bolt.
Looking at your picture pins are 1-2-3-4 starting at the bottom.

An example:
https://www.gmpartsdirect.com/oem-pa...ensor-55568175

[nviym]

Originally Posted by ctrlz

That seems to be an aftermarket part number modeled after a Bosch sensor. Probably ac Delco has their own number too. Anyway the pin order starts with 1 on the side of the hole for the mounting bolt.
Looking at your picture pins are 1-2-3-4 starting at the bottom.

An example:
https://www.gmpartsdirect.com/oem-pa...ensor-55568175

Thanks I do have them in the order you specified and Im still getting the same engine codes P0236 and P0238 and the car throws its self in the power reduce mode..

[GXP08jrf]

It looks like you did a wire-to-wire repair, are your splices soldered? These sensors can be sensitive to circuit resistance. If your splices aren't soldered, it might be enough for the diagnostics to detect an issue and throw a code.

[nviym]

Originally Posted by GXP08jrf

It looks like you did a wire-to-wire repair, are your splices soldered? These sensors can be sensitive to circuit resistance. If your splices aren't soldered, it might be enough for the diagnostics to detect an issue and throw a code.

Yes it was a wire to wire connection i can go back and solderthem together and see if that helps. Thank you

[ctrlz]

I would check continuity back to the ECM pins/connector.
If the car is running in reduced power mode, you could also hook up a scan tool and confirm you are getting intake air temp readings which make sense. Your problems all seem to be related to the pressure side of the sensor. If you are getting temp readings, chances are your ground (low ref), +5V, and temp signal wires are good. That leaves pressure signal wire as the main suspect.