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On my 2012 Toyota Noah 2000cc, what is knock control CPU malfunction?

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On my 2012 Toyota Noah 2000cc, what is knock control CPU malfunction?

Vehicle: 2012 Toyota Noah 2000cc

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The CPU is Central processing unit, or in another term the ECM, The purpose of the knock sensor is to control a engine knock by retarding the timing, it fails 2 ways the engine knock is beyond its control or range, or the knock sensor power , ground supply failed

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