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 Post subject: How to test if MAF sensor or connector is bad
PostPosted: Thu Feb 04, 2010 3:18 pm 
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I have a P0100 code showing up. Not sure if it's the MAF sensor or the connector, this happened after ORM and reconnecting the sensor ...... How can I test the MAF sensor to see if it's the culprit?

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Sun Feb 07, 2010 9:52 pm 
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Can someone smarter than me help me out with this?

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Sun Feb 07, 2010 11:53 pm 
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P0100-MAF SENSOR SIGNAL VOLTAGE TOO HIGH

My guess would be the MAF sensor was damaged while you had it unplugged... Can this be checked with a voltmeter?

I'm not smarter than you.... In fact, I don't have a freaking clue. But I thought I'd at least throw out a guess :SOMBRERO:

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Tue Feb 09, 2010 12:47 pm 
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Thans Stout ..... I appreciate the advice.

Can anyone suggest a good electrical parts cleaner that will dissolve oxidation on the connector terminals?

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2005 Jeep Liberty Sport CRD.
2005 Jeep Liberty Limited CRD - Totaled 3/19/2012 (Not at fault), towed to bone yard and sold at auction.
1997 Jeep Sahara, Hunter Green - 307,000m -
1983 MBenz 240D - garaged, midnight blue, showroom condition.


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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Tue Feb 09, 2010 12:55 pm 
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Check your FSM, there should be a MAF test sequence for the unit.

Your LAS should have a spray can of electric component cleaner, spray and pray. The best way is to remove the pins from the plug and give them a good cleaning with emery cloth, or a mixture of baking soda and water. After reassembly, use some dieletric grease on all connections, OR pack the plug and socket with grease and tape over to prevent further corrosion.

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It must be air in the fuel!


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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Tue Feb 09, 2010 2:16 pm 
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Thanks Rich,

Check your FSM, there should be a MAF test sequence for the unit, OK i'll have a look.

I am assuming that LAS = Local Autoparts Store?

You said that "The best way is to remove the pins from the plug" But the plug is super small and the pins are microscopic ..... how does one begin to do that.

I wonder if I couldn't just submerge it in a solution for a while, one that doesn't harm the plastic cover, what do you think?

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2005 Jeep Liberty Sport CRD.
2005 Jeep Liberty Limited CRD - Totaled 3/19/2012 (Not at fault), towed to bone yard and sold at auction.
1997 Jeep Sahara, Hunter Green - 307,000m -
1983 MBenz 240D - garaged, midnight blue, showroom condition.


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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Tue Feb 09, 2010 3:28 pm 
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I would try chlorine-free brake parts cleaner - it evaporates rapidly and should only cause minimal damage to the plastic as long as you don't overspray.

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Tue Feb 09, 2010 6:48 pm 
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The original post doesn't say whether you tried to clear the code with a code reader. It takes a few drive cycles for it to clear on its own...

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Tue Feb 09, 2010 7:35 pm 
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Goglio,

I had the codes cleared at AutoZone several times, and it returned everytime.

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2005 Jeep Liberty Limited CRD - Totaled 3/19/2012 (Not at fault), towed to bone yard and sold at auction.
1997 Jeep Sahara, Hunter Green - 307,000m -
1983 MBenz 240D - garaged, midnight blue, showroom condition.


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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Wed Feb 10, 2010 1:49 pm 
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Quote:
I had the codes cleared at AutoZone several times, and it returned everytime.


I've done the same thing; codes came back as I was backing out of parking lot. When I get around to it on a warmer day, I'm gonna try and clean the pins if possible, not sure how to make sure pin sockets are clean. Someone mentioned that we should've put som sort of dust cap or tape over connector to keep it clean and protect from corrosion. I just wanted to plug mine back up and clear codes to see if CEL was indicative of any other problems. Found out I might have GP#1 and #3 problem.

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Wed Feb 10, 2010 9:26 pm 
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racertracer wrote:
Thanks Rich,

I am assuming that LAS = Local Autoparts Store?

Yep, stolen from LBS (Local Bike Shop)

Quote:
You said that "The best way is to remove the pins from the plug" But the plug is super small and the pins are microscopic ..... how does one begin to do that.

I will check on my Jeep when my wife gets back from her parent's place. Subaru is dead, so we are down to one winter-able vehicle till insurance gets around to their job. Should be a matter of slipping the main lock out of the plug assy, using a probe to move the locking clips, and pulling the wires/pins out of the plug. Sadly there is nothing you can do for the male pins on the MAF itself, because they are fuzed in there. Best bet there is some electrical parts cleaner and some compressed air to dry it out.

DO NOT USE BRAKE CLEANER Most are quite corrosive to plastic, rubber, and silicone... which your MAF plug is made of.

Quote:
I wonder if I couldn't just submerge it in a solution for a while, one that doesn't harm the plastic cover, what do you think?


CAC has a very nice product for cleaning the MAF sensor, it is safe for the sensor, plastics, and all other bits in the assembly.

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It must be air in the fuel!


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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Wed Feb 10, 2010 9:48 pm 
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I heard of CRC cleaner but never heard of the one you mention.

Google came back with nothing.

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2005 Jeep Liberty Sport CRD.
2005 Jeep Liberty Limited CRD - Totaled 3/19/2012 (Not at fault), towed to bone yard and sold at auction.
1997 Jeep Sahara, Hunter Green - 307,000m -
1983 MBenz 240D - garaged, midnight blue, showroom condition.


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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Wed Feb 10, 2010 9:51 pm 
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racertracer wrote:
I heard of CRC cleaner but never heard of the one you mention.

Google came back with nothing.


http://www.crcindustries.com/auto/conte ... aspx?ID=79


05110 -- Mass Air Flow Sensor Cleaner, 11 Wt Oz

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 Post subject: Re: How to test if MAF sensor or connector is bad
PostPosted: Wed Feb 10, 2010 9:53 pm 
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Thanks

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2005 Jeep Liberty Limited CRD - Totaled 3/19/2012 (Not at fault), towed to bone yard and sold at auction.
1997 Jeep Sahara, Hunter Green - 307,000m -
1983 MBenz 240D - garaged, midnight blue, showroom condition.


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