The frequency will vary within a range of around 2000 Hertz at idle to near 10,000 Hertz at maximum engine load. The MAF sensor produces a frequency signal which can be monitored using a scan tool. A large quantity of air entering the engine indicates an acceleration or high load situation, while a small quantity of air indicates deceleration or idle. The PCM uses the mass air flow information to monitor engine operating conditions for fuel delivery calculations. The Mass Air Flow (MAF) sensor measures the amount of air which passes through it into the engine during a given time. I attached a flow chart for you to follow.įollow the steps and let me know what you find. So it seems the original MAF is working within specifications? So why is this code thrown? I tested the Hertz with my test bench set to 20 Hertz and the signal wire (yellow) had a fairly consistent 2.14 hertz at idle (engine warm) and when the engine revved it smoothly went to just above 14 hertz and then evenly went back down to 2.14 when the idle was slowly released. The power wire (red) had almost 13 volts, the ground (black) wire was grounded, and the signal wire had about 6 volts.ģ) With the engine running and the harness attached: Plus, I then tested it with my multi-meter, here are the results:ġ) With the harness disconnected and the engine/ignition off:Īll three wires (red, black and yellow) ohm-ed out as ground.Ģ) With the key in the ignition and it turned to run position without the engine on: So I removed the new plastic one and replaced it with the original aluminum one (that's clean as a whistle) and there was no change in the error code. Just test drove her again and got the error code:
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