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Thread: Testing MAF 3.9 V8 D1

  1. 18th December 2015, 04:15 PM #1
    SeanP
    SeanP is offline Master Supporter
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    Testing MAF 3.9 V8 D1

    Hey all,

    As the title suggests I'm after how to test my MAF for my 94 V8.

    CO trim is set to 1.1V. I believe my MAF is getting power, however the circuit which detects the airflow being the first and second wires from the left (red/black and green/blue) are showing a constant 8.9v. I think, that that should be around 1v, increasing with airflow, if I'm not wrong? I blew through the MAF while testing that circuit with no change to voltage.

    Car is running fairly rough and VERY rich at the moment. Having MAF plugged in or not makes no difference. If there is a difference it isn't noticeable by sound or ability for car to rev.

    Will a simple clean of the diodes fix this up? I don't have any contact cleaner, but I've been a naughty boy and used throttle body cleaner in the past.
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  2. 18th December 2015, 05:13 PM #2
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    sierrafery
    sierrafery is offline YarnMaster Silver Subscriber
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    Between the wires which are going into the ECM(blue/red - blue/green) the output range must be between 0.5/0.8v at idle growing to 4.5/4.7V at hard suction, 12V on the brown/orange wire... if you have above 5V there it means that there's an internal fault of the MAF's electronics and you need a new one, i doubt that cleaning it would help in this case
    Discovery Td5 (2000), manual, tuned
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  3. 18th December 2015, 05:49 PM #3
    SeanP
    SeanP is offline Master Supporter
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    Yep, certainly appears that way.

    I've got 1.1volts on CO trim, 12v on power, then 8.9v on the sensors, so I unfortunately think it has died. I recall only a few weeks ago it reading 1.x at idle so I feel that it's gone
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