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Thread: MAF resistance values

  1. 23rd June 2012, 06:23 PM #1
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    MAF resistance values

    Hi all,

    Doing some rainy day maintenance on the truck today and opened the airbox to check the filter (ughhh! - crap and insects but most frightening was the muddy tide mark all the way up to the filter seal). However! whilst it's apart i thought i would check the MAF sensor (first time i'd had it out). The housing was clean enough although the sensor wires themself had black scale on them so down to the auto shop for a can of MAF cleaner. Now i assume it's working okay'ish and so worth the $26 i just spent on the cleaner. I don't like not knowing so i decided to GOOGLE for the resistance values for the SIEMENS 5WK9607 MAF SENSOR but didn't ping any. Anyway here's what i measured....

    across Pin 3 and Pin 2 = approx 3 k Ohms

    across Pin 2 and Pin 1 = approx 2 K Ohms

    across Pin 3 + Pin 1 = 400 Ohms

    Does any member of the forum know what the values for a healthy MAF should be - is my MAF dead!!

    onebob
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  2. 24th June 2012, 06:31 AM #2
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    Last edited by OffTrack; 24th June 2012 at 06:39 AM. Reason: double post
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  3. 24th June 2012, 06:38 AM #3
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    mturri posted figures earlier in the year:

    http://www.aulro.com/afvb/1638565-post6.html

    I'd double check your readings because Matt suggests that pin 1-2 is usually 16.8K Ohm for good and bad MAFs. I suppose yours could be more comprehensively stuffed than the examples he tested.

    cheers
    Paul
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  4. 24th June 2012, 06:39 AM #4
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    Thanks Paul,
    have added to TGO
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
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    Home is where you park it..

    [IMG][/IMG]
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  5. 24th June 2012, 08:12 AM #5
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    Hi Offtrack, Thanks a million for pointing me to those figures and BTW a keyword search on the forum before i posted my query didn't find ANY relevant posts.

    Yes my readings are questionable cos i had to rely on an ancient hobby analogue multimeter because my FLUKE digital voltage tester only reads to 1k Ohm

    So today i off to JAYCAR today for one of their mid range Digital meters.

    more soon......

    onebob
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  6. 24th June 2012, 09:48 AM #6
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    Bob the only way I can ever find it is by searching with mturri as the poster, which is fine if you know the post exists and who posted it.
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  7. 24th June 2012, 01:00 PM #7
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    Okay just back from JAYCAR with new meter and here's my MAF resistances.....

    Pins 1-2 = 16.8 Kohm
    Pins 1-3 = 21 Mohm
    Pins 2-3 = 21 Mohm

    16 Kohm across pins 1 and 2 is said to be a constant irrespective of MAF condition, So looking at the Mohm values and if an example of a dead one is 6.25Mohm and new ones are 34 Mohm then mine is still 'serviceable' i guess - am I correct?

    onebob
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  8. 24th June 2012, 01:09 PM #8
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    OneBob,

    I think those values are actually pretty close ( within roughly 2M Ohm) to the second "used dodgy" MAF Matt gives figures for, and are significantly off (around 13M Ohm ) the new MAF readings. I'd definitely be treating your MAF as dodgy.

    A MAF that gives incorrect readings will just as surely degrade performance as one that is completely dead. I replaced one in my D2 that was reading mid-500's under full throttle and heavy load and the improvement was very obvious.

    cheers
    Paul
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  9. 24th June 2012, 06:00 PM #9
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    thanks Paul,

    yes! I gotta accept that the MAF is past it's prime - just like me

    I did use the CRC MAF Cleaner on it and it's staggeringly good - restoring the sensor wires and plate to as shiny as new but i expect that'll not effect the resistance measurements.

    How much is a new OEM MAF?

    Robert
    Last edited by onebob; 24th June 2012 at 06:05 PM. Reason: clarification
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  10. 25th June 2012, 06:01 AM #10
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    You are looking at £70-75 for a VDO/Siemens 5WK9607Z part. You can buy chinese copies off ebay for cheaper but it's not something I'd recommend.
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