Testing is to be carried out with the HHT
The compression testing screen is located under the actuations menu.
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CDI Actuations
1 Idle speed control
2 Exhaust gas recirculation
3 Boost pressure control
4 Irregular running
5 Compression test
6 Suction fan
7 Element shutoff
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Compression test
To start off the measurement, the compression can be checked using the HHT.
As of a speed difference of > 7 revolutions it may
be a mechanical fault.
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If the speed differences are exceeded, a mechanical compression pressure test/cylinder leak test must be carried out on all cylinders to accurately locate the faults.
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HHT mask
Correct graphic for compression test
Shown on engine 611
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CDI Actuations
Cylinder
1 - 4000 rpm
3 - 4000 rpm
4 - 4000 rpm
2 - 4000 rpm
Engine speed
258 1 rpm
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HHT mask
Rejection pattern compression check
Shown on engine 611
Cyl.2 221 rpm (min.)
Cyl.4 228 rpm (max.)
Diff. 7 rpm
CDI Actuations
Cylinder
1 - 4000 rpm
3 - 4000 rpm
4 - 4000 rpm
2 - 4000 rpm
Engine speed
235 1 rpm
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