Perkins — The engine operating conditions are monitored.

A Perkins service procedure — check it applies to your exact model before use.

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Procedure

1. Engine monitoring
2. Engine speed governing
3. Control of the injection pressure
4. Cold start strategy
5. Automatic air/fuel ratio control
6. Torque rise shaping
7. Injection timing control
8. System diagnostics
9. Aftertreatment low temperature regeneration

Source: manual:992774__24_1204e_e44t__4tta_mk_ml.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.