Perkins — The following monitored engine operating conditions

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

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Procedure

1. Engine Coolant Temperature
2. Engine Oil Pressure
3. Engine Speed
4. Intake Manifold Air Temperature
5. Engine Intake Throttle Valve Fault
6. Wastegate Regulator
7. Supply Voltage to Sensors
8. Fuel Pressure in Manifold (Rail)
9. NOx Reduction System
10. Engine Aftertreatment System

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.