2018 GMC Terrian 1.6 turbo diesel- drivability issue

This car has drivability with iat codes and baro codes..

Owner has changed MAF sensor which contains the IAT but to no avail, Baro was changed but still there is high circuit.

Iat line was checked for open circuit and all the reference voltages are coming alright, yet sensor report iat high code and baro...

Help please, this is error codes images

Check ground wires clean them and the surface they mount to. And Check wires for green crusties and resistance with harness disconnected at both ends pcm, block ground point, etc. Same for power feed to those sensors. Since you have iat and ect sensor codes check for a common ground point either on engine block or pcm ground.

forumoto wrote: Iat line was checked for open circuit and all the reference voltages are coming alright, yet sensor report iat high code and baro...

Can you provide us with some voltage readings? KOEO, backprobed on all eight Multifunction Air Intake Sensor wires.

Hi, I will get the voltage reading to the forum soon, but here is more information as related to wiring diagram which i want to share with the public ... i know this might help to narrow down the issue as well

thanks for taking your time to study this information...

file is zipped


all the 5v reference is showing up , including the low reference

Any tsb’s our for this concern?

Tsb list does not contain any info related to none of the faults codes in my scan report

Got problem solved by closing the pins goes connect to the pin 1 and 3 of the B75C,

Now there is no more all those codes above, what I am now left with is the emission message on the label, whereas there is no fault codes present in the ecm, yet the IPC display Emission message. Any way out or should I flash the pcm .

Thanks

Problèm FIXED... a full reflash also took care of the emission messages which keep coming on the IPC

Nice catch with the spread pins.