Knock recognition control stop, checking: Notes

The following tests must be performed when a DTC is stored that relates to "knock recognition control limit reached".

KNOCK RECOGNITION CONTROL STOP CHART

Possible cause		Corrective action
DTC for all cylinders or DTC for all cylinders in one row	Poor fuel quality	Change fuel quality (see operating instructions)
	Knock sensor tightened to incorrect torque	Loosen knock sensors and tighten to 20 Nm
	Knock sensor faulty	Check knock sensors KNOCK SENSORS, CHECKING
	Corrosion at harness connector
	Engine accessories loose	Secure engine accessories
DTC for one Cylinder	Engine damage	Check compression pressure
DTC for one Cylinder	Engine accessories loose	Secure engine accessories

Also check ignition angle retardation of individual cylinders. See CHECK IGNITION ANGLE RETARDATION OF THE INDIVIDUAL CYLINDERS .