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Component Testing
The engine
knock sensor is affected by a number of factors, A few of these are: ignition timing, cylinder pressure, fuel octane, etc. The knock sensor generates an AC voltage whose amplitude increases with the increase of engine knock. The knock sensor can be tested with a digital voltmeter. The RMS voltage starts at about
20 mVac (at about
700 rpm) and increases to approximately
600 mVac (
5000 rpm). If the output falls outside of this range a DTC will be set.