Check with the following in mind.
1. Reduce the pressure in the engine power system.
2. Using the diagnostic equipment, verify that the fuel pressure has dropped to zero and the fuel temperature has reached the outside temperature or is below 30°C (depending on which temperature is higher).
WARNING: Do not perform any operation on the fuel injection system without making sure that the fuel pressure has dropped to zero and its temperature has reached the outside temperature or below 30°C (depending on which temperature is higher). Failure to follow these requirements may result in an accident.
3. Remove the mudguard and crankcase protection (see Cylinder Compression Test).
4. Remove the glow plug relay.
5. Remove the decorative engine cover (see Removal and installation of a decorative casing of the engine).
NOTE: The decorative engine cover is mounted on three ball struts. The ball struts are not vertical, but tilted back at an angle of approximately 20°.
6. Separate electric sockets of fuel atomizers.
7. Remove the exhaust gas recirculation heat exchanger.
8. Remove the EGR valve.
9. Remove the glow plug power cable.
10. Remove glow plugs.
11. Install a compression tester in the glow plug hole.
12. Turn a cranked shaft of the engine a starter.
NOTE: Turn the crankshaft until the pressure on the compression gauge stops increasing.
13. Measure the compression in all cylinders of all cylinders, following the compression gauge manufacturer's instructions. Low compression in individual cylinders can result from loose valves in the seats, damaged cylinder head gaskets, broken or burnt piston rings. Low compression in all cylinders indicates worn piston rings.
NOTE: The ECM will receive an error message when the fuel pump relay is removed or the electrical components are disconnected. After checking the compression, clear this message from the RAM using the diagnostic equipment.
14. Install the parts in the reverse order of removal.
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