As I understand it, he only wants to amplify the signal from the sensor because it is inadequate. Since it is the frequency of the signal, not the amplitude that the ECM is using, this should make no difference in the operation of the engine, and the emission testing would have the same results as it would with a sensor that had adequate output. So, perhaps technically cheating, but in reality, the engine is doing what it should and not producing any extra emissions, so not cheating by the spirit of the law.Sorry to bang on, but I'm still having a problem understanding the logic behind this. Correct me if/where I'm wrong :
1) If the ISS sensor output is only 1.5VAC at idle, it (or its connection) is faulty.
2) If you build a circuit which has output pulses whose negative-going excursions go at least abou 7V below the battery +ve voltage you can clear the error light.
3) The visual test will pass.
3) The inspector will then proceed to do the emissions test.
4) The test is done at more than one input shaft speed.
5) Your faulty ISS will be in use for the emissions test.
6a) The built circuit is also in use during that test. If the test is passed you have cheated the test.
OR
6b) The built circuit is not used for the emissions test. The error light will come back on. The test is failed.
6c) Cheating the test is illegal where you are.
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Bob