			Test results
1	COMPONENT CONCERNED	ELECTRICAL CONNECTIONS CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Connections on pressure sensor and engine management control unit	Check for loose electrical connections at the intake pressure sensor and at the engine management control unit.	Go to Step 2	Presence of loose electrical connections.	Restore the correct connections.
2	COMPONENT CONCERNED	WIRING CONTINUITY CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Intake pressure sensor wiring	Check for breaks in the wiring continuity	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	COMPONENT CONCERNED	WIRING INSULATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Intake pressure sensor wiring	Check the condition of the wiring insulation	Go to Step 4	Wiring insulation faulty.	Restore correct wiring insulation.
4	COMPONENT CONCERNED	EARTH CONNECTIONS CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Intake pressure sensor wiring	Check the condition of the earth connections.	Go to Step 5	Breaks in the wiring continuity.	Restore the correct earth connections.
5	COMPONENT CONCERNED	CHECK FOR SEEPAGE IN INTAKE MANIFOLD	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Intake manifold	Check for any seepage in the intake manifold	Go to Step 6	Seepage inside the intake manifold.	Restore correct operation
6	COMPONENT CONCERNED	CYLINDER COMPRESSION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Engine	Carry out cylinder compression test Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED	Go to Step 7	Cylinder compression insufficient.	Go to Step 10
7	COMPONENT CONCERNED	CHECK ON CYLINDER HEAD GASKET AND VALVE OIL SEALS	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Cylinder head	Check: - that the cylinder head is correctly tightened;	Go to Step 8	Cylinder head tightening not correct.	Restore the correct cylinder head tightening.
8	COMPONENT CONCERNED	CYLINDER HEAD GASKET CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Cylinder head gasket	Check the correct cylinder head tightening	Go to Step 9	Gasket damaged.	Replace the cylinder head gasket Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET
9	COMPONENT CONCERNED	VALVE OIL SEAL CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Valve oil seals	Check the correct sealing of the valve oil seals	Go to Step 10	Oil seal compromised.	Restore the correct oil seal.
10	COMPONENT CONCERNED	CAUSE OF INSUFFICIENT COMPRESSION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Valves	After having removed the cylinder head Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET check: - the valve seal; - cylinder/piston ring wear.	Go to Step 11	Valve seal insufficient.	Overhaul the cylinder head.
11	COMPONENT CONCERNED	CAUSE OF INSUFFICIENT COMPRESSION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Piston rings	After having removed the cylinder head Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET check: - cylinder/piston ring wear;	Go to Step 12	Cylinder/ring wear outside tolerances	Restore correct operating clearances.
12	COMPONENT CONCERNED	TIMING CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Engine	Check that the timing is correct	Go to Step 13	Timing not correct.	Restore the correct timing
13	COMPONENT CONCERNED	PRESSURE READING CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Pressure sensor	Check the pressure from the manifold pressure sensor by connecting the diagnostic equipment	End of diagnosis	Pressure value incorrect	Go to Step 14
14	COMPONENT CONCERNED	INTAKE PRESSURE SENSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Pressure sensor	Check that the intake pressure sensor is working correctly	End of diagnosis	Intake pressure sensor not working correctly.	Replace the intake pressure sensor Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.