4.21.1 Description

When all of the entry conditions have been satisfied, the input signals from the two knock sensors are checked against variable upper and lower threshold levels that are dependent on engine speed. If either sensor input is outside the threshold, then a failure will be flagged. If a failure is noted on two drive cycles the MIL will illuminate.

Fig 1: Knock Sensor (P0327, P0328, P0332, P0333)

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Fig 2: Knock Sensor Low Limit Threshold - P0327, P0332 (Naturally Aspirated)

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Fig 3: Knock Sensor High Limit Threshold - P0328, P0333 (Naturally Aspirated)

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Fig 4: Engine Load Entry Condition For Knock Sensor Diagnostic - P0327, P0328, P0332, P0333 (Naturally Aspirated)

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Fig 5: Knock Sensor Low Limit Threshold - P0327, P0332 (Supercharged)

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Fig 6: Knock Sensor High Limit Threshold - P0328, P0333 (Supercharged)

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Fig 7: Engine Load Entry Condition For Knock Sensor Diagnostic - P0327, P0328, P0332, P0333 (Supercharged)

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