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Old 06-18-2012, 06:59 PM   #1
1989toyotasupraandpickup
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Join Date: Jun 2012
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Thumbs up Testing the 7mgte kvafm

"To properly test the 7mgte AFM, one needs an oscilloscope. I suppose thats why Toyota didn't publish the test procedures in the TSRM. I took my car to a local shop where they hooked up an oscilloscope and checked the wave pattern. Its supposed to be a constant square wave that gets higher frequency as the rpms go up. A bad AFM will show an erratic signal, sometimes just flatline or much lower frequency than normal. The test in the TSRM is just for air temperature". I have not tried this as i dont have an oscilloscope at the moment. hope this works for someone that has one.
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