HHT mask
Acceptance pattern irregular operation
Shown on engine 611
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CDI Actuations
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Cylinder
1 748 rpm
3 749 rpm
4 748 rpm
2 748 rpm
Engine speed
750 rpm
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HHT mask
Rejection pattern irregular operation
Shown on engine 611
Fault on cylinder 2
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CDI Actuations
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Cylinder
1 741 rpm
3 772 rpm
4 774 rpm
2 712 rpm
Engine speed
759 rpm
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Before starting this actuation, the cylinder-specific quantity injected for the smooth operation correction (see HHT, actual values, check idle position) are to be read out.
Irregular running
The irregular operation check must be conducted when the vehicle is at a standstill. If a cylinder with a limiting value (see HHT, actual values, check idle position, smooth operation correction) exhibits a
distinct drop in speed in comparison to the previous one, this points to a faulty injector in the cylinder concerned.