LHS V6-3.5L VIN G (1998)
Knock Sensor: Testing and Inspection
Component Testing
The engine knock sensor is affected by a number of factors. A few of these are:
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ignition timing
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cylinder pressure
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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:
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The RMS voltage starts at about 20mVac (at about 700 rpm) and increases to approximately 600 Vac (5,000 rpm).
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If the output falls outside of this range a DTC will be set.