Code P0102, what is pin-out for the 3 wires coming out of the MAF Sensor?

CHAD KEN RUSHKA

MEMBER
2013 PONTIAC GRAND AM
3.4L
V6
2WD
AUTOMATIC
200,000 MILES

Correction - the vehicle is a 2003 Grand Am GT (V6). The car is throwing a P0102 check engine light, stating that the MAF has low voltage. The car has a tough time starting, hunts for idle, and the transmission is shifting really hard.

All my research says this points to a MAF sensor. Replaced the MAF, but problem still exists.

I am getting 5V on the yellow wire. The black wire appears to be GND, and the pink wire is showing nothing.

I would like to know if the pink wire on the MAF Harness is for the Signal Line, or is the yellow wire the signal line?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

The pink wire should have 12 volts please check the fuse PCM IGN #39. this guide can help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

The P0102 code in a 2003 Pontiac Grand Am refers to an issue with the Mass Air Flow (MAF) sensor. This code indicates that the MAF sensor is reporting a low voltage output compared to what is expected by the Engine Control Module (ECM). The MAF sensor measures the amount of air entering the engine to help the ECM calculate the correct air-fuel mixture for combustion.

here are the MAF sensor wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.

Images (Click to make bigger)