Service & Repair Manual

28-33
Knock recognition control stop,
checking
The following tests must be performed when a
DTC is stored that relates to "knock recognition
control limit reached".
Possible cause Corrective action
DTC for all cylinders
Poor fuel quality
- Change fuel quality
(see operating instructions)
or
DTC for all cylinders in one
row
Knock sensor tightened to incorrect
torque
- Loosen knock sensors and tighten to 20
Nm
Knock sensor faulty
- Check knock sensors Page 28-41
Corrosion at harness connector
Engine accessories loose
- Secure engine accessories
DTC for one Cylinder
Engine damage
- Check compression pressure
Engine accessories loose
- Secure engine accessories
- Also check ignition angle retardation of the
individual cylinders Page 28-34 .
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