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Thread: Air flow constant 4.4 Nanocom TD5 = MAF fail?

  1. 23rd March 2015, 12:05 PM #1
    Jazzman
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    Air flow constant 4.4 Nanocom TD5 = MAF fail?

    Can someone please confirm an unchanging (idle, 3000rpm of while driving) air flow reading of 4.4 is either a failed MAF or MAF loom connection?
    It reads 4.3 with the MAF unplugged. I've also had a scenario where the car would not accelerate for about 5 second then it would take off.
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  2. 23rd March 2015, 02:54 PM #2
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    Rok_Dr
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    Yep. That's a dead signal and exactly the same problem I had a couple of years ago. The following thread gives some detail and pointers.

    TD5 MAF Stuffed?

    BTW you can also check the MAF using a multimeter, but make sure it can read high enough resistances as a lot of cheap ones can't go high enough.

    Cheers
    Steve
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  3. 23rd March 2015, 07:01 PM #3
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    sierrafery
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    Hi, just confirm that 4.4/4.3 reading is air flow(kg/h) or voltage?... anyway if it's air flow it's probably a dead MAF and there's a reading error cos it should be 0 with MAF unplugged but i've seen similar cases when the reading was not 0
    Discovery Td5 (2000), manual, tuned
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  4. 23rd March 2015, 08:14 PM #4
    Jazzman
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    Quote Originally Posted by sierrafery View Post
    Hi, just confirm that 4.4/4.3 reading is air flow(kg/h) or voltage?... anyway if it's air flow it's probably a dead MAF and there's a reading error cos it should be 0 with MAF unplugged but i've seen similar cases when the reading was not 0
    The reading is what Nanocom displays under airflow, either when in the "instruments" screen or under "TD5 inputs - Airflow"

    This was my thought as well as on another thread, possibly the one Rok_Dr has posted a link to, talked about reading 4.4 volts, gnd and variable output.
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