Electrical issue, MAF not working?

FAFO_DURAMAXLMM

MEMBER
2010 GMC SIERRA
6.6L
V8
TURBO
4WD
AUTOMATIC
264,211 MILES

At first my mass air flow wasn’t working. I have an onboard edge monitor and it’s not showing any reading from the mass air flow sensor. I have a Matko Maxlite it also shows no reading from the mass air flow.
It also shows no ECM equipped on the obd2

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

Are you able to get the scanner to power on? As far as the ECM and the MAF are concerned, I need you to check a couple of fuses. (see pic below).

The fuses are in the under-hood fuse box. The ECM battery fuse (fuse 11) and the engine fuse (fuses 3, 12, 17, 53). When you check them, note that fuse 11 should have power at all times. Check both sides of the fuse for power. Fuses 3, 12, 17 only get power when the powertrain relay is actuated. Fuse 53 gets it with the key on.

I hope that made sense. LOL Check those and let me know what you find. Also, here is a link explaining what I mean by checking power at the fuses:

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

Take care,

Joe

See pic below.

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Sunday, July 28th, 2024 AT 7:18 PM

FAFO_DURAMAXLMM

MEMBER
3 POSTS

Yes, the scanner does power up I checked all the fuses you said to and they are all working right I noticed that my truck won’t start with the key when you turn key to start it does nothing I changed my under hood fuse box and nothing different still saying eco not equipped.

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Wednesday, July 31st, 2024 AT 7:11 PM

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

I suspect you meant it still says ECM not equipped. At this point, we need to assume the ECM has failed. However, that isn't a cheap part to replace.

By chance, could you get your hands on a used ECM just so we could see if the "not equipped" indicator goes away?

Let me know that. Also, I'm going to ask the site owner if he has any suggestions.

Take care,

Joe

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Wednesday, July 31st, 2024 AT 8:16 PM

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

So, I see you are using an onboard edge monitor, can I ask if you connect a regular code reader are there any codes?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

You may had a bad edge monitor or it is not connected correctly. Also is there a check engine light on? If the MAF sensor has not working you will have codes.

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Friday, August 2nd, 2024 AT 12:08 PM

FAFO_DURAMAXLMM

MEMBER
3 POSTS

Yes, I am using an edge monitor, but I also have a Matco Maxlite that also reads VIN and all the other modules except the ECM and Glow plug module. It says they are not equipped and now not only does the ignition not spin it over it doesn’t turn cluster on. I’ve replaced the fuse block under hood and I’m going to try another ECM, so I’ll update when I do that.