Flat Ohm Test on MAF Sensor on 2005 GMC Sierra


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Flat Ohm Test on MAF Sensor on 2005 GMC Sierra

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Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes

forest813
New User

Dec 17, 2013, 7:52 PM

Post #1 of 4 (1833 views)

Flat Ohm Test on MAF Sensor on 2005 GMC Sierra	Sign In

I have 4 codes recently read on my 2005 Sierra. They are P0101, P0171, P0174 and P0446.
Dealing with P0101 - I tested for power to the sensor which gave me a reading of 10-11 volts. I did an ohm test on the MAF as the motor was idling and brought the RPM up gradually to 2500 and than decelerated the same. I got a constant reading of 11 ohms without any fluctuations. Does that indicate a bad MAF sensor?
Motor size is 5.3 L with 120,000 KLm

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 17, 2013, 8:07 PM

Post #2 of 4 (1826 views)

Re: Flat Ohm Test on MAF Sensor on 2005 GMC Sierra	Sign In

You have lean codes along with a MAF code, I would take a hard look at the intake snorkel for any leaks or hoses disconnected

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

forest813
New User

Dec 18, 2013, 5:57 AM

Post #3 of 4 (1803 views)

Re: Flat Ohm Test on MAF Sensor on 2005 GMC Sierra	Sign In

Do I spray carb cleaner on those areas to check for leaks?

Discretesignals
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Dec 18, 2013, 5:58 AM

Post #4 of 4 (1802 views)

Re: Flat Ohm Test on MAF Sensor on 2005 GMC Sierra	Sign In

Not trying to be an a hole, but ohm testing a MAF is wrong, especially when you have power running through it. The digital MAF sensor on a GM generates a voltage frequency, you need something such as an lab scope to measure the frequency with.

Some multimeters can take frequency measurements too, but you may not be able to do a performance snap throttle test and and see the air gulp if the sample rate is too low.

Check out this video:

http://www.youtube.com/watch?v=h5KAHv47viw

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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