		Test results
1	ELECTRICAL CONNECTIONS CHECK	All OK	Problems encountered	Operation
	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	WIRING CONTINUITY CHECK	All OK	Problems encountered	Operation
	Check for breaks in the wiring continuity See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	WIRING INSULATION CHECK	All OK	Problems encountered	Operation
	Check the condition of the wiring insulation	Go to Step 4	Wiring insulation faulty.	Restore correct wiring insulation.
4	EARTH CONNECTIONS CHECK	All OK	Problems encountered	Operation
	Check the condition of the earth connections.	Go to Step 5	Breaks in the wiring continuity.	Restore the correct earth connections.
5	CHECK FOR SEEPAGE IN INTAKE MANIFOLD	All OK	Problems encountered	Operation
	Check for any seepage in the intake manifold	Go to Step 6	Seepage inside the intake manifold.	Restore correct operation
6	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	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 8
7	CHECK ON CYLINDER HEAD GASKET AND VALVE OIL SEALS	All OK	Problems encountered	Operation
	Check: that the cylinder head is correctly tightened; the seal of the gasket; the seal of the valve oil seals.	Go to Step 8	1. Cylinder head tightening not correct. 2. Gasket damaged. 3. Oil seal compromised.	1. Restore the correct cylinder head tightening. 2. Replace the cylinder head gasket Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET 3. Restore the correct oil seal.
8	CAUSE OF INSUFFICIENT COMPRESSION CHECK	All OK	Problems encountered	Operation
	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 8	1. Valve seal insufficient. 2. Cylinder/ring wear outside tolerance.	1. Overhaul the cylinder head. 2. Restore correct operating clearances.
9	TIMING CHECK	All OK	Problems encountered	Operation
	Check that the timing is correct	Go to Step 9	Timing not correct.	Restore the correct timing
10	PRESSURE READING CHECK	All OK	Problems encountered	Operation
	Check the pressure from the manifold pressure sensor by connecting the diagnostic equipment	Go to Step 12	Pressure value incorrect	Go to Step 11
11	INTAKE PRESSURE SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the intake pressure sensor is working properly by carrying out the See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSOR	Go to Step 6	Intake pressure sensor not working properly.	Replace the intake pressure sensor Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
12	ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine management control unit is working properly.	End of diagnosis	Engine management control unit faulty.	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

SIGNAL NOT VALID

		Test results
1	ELECTRICAL CONNECTIONS CHECK	All OK	Problems encountered	Operation
	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	WIRING CONTINUITY CHECK	All OK	Problems encountered	Operation
	Check for breaks in the wiring continuity See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	CHECK FOR SEEPAGE IN INTAKE MANIFOLD	All OK	Problems encountered	Operation
	Check for any seepage in the intake manifold	Go to Step 4	Seepage inside the intake manifold.	Restore correct operation
4	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out cylinder compression test Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED	Go to Step 5	Cylinder compression insufficient.	Go to Step 6
5	CHECK ON CYLINDER HEAD GASKET AND VALVE OIL SEALS	All OK	Problems encountered	Operation
	Check: that the cylinder head is correctly tightened; the seal of the gasket; the seal of the valve oil seals.	Go to Step 6	1. Cylinder head tightening not correct. 2. Gasket damaged. 3. Oil seal compromised.	1. Restore the correct cylinder head tightening. 2. Replace the cylinder head gasket Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET 3. Restore the correct oil seal.
6	CAUSE OF INSUFFICIENT COMPRESSION CHECK	All OK	Problems encountered	Operation
	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 7	1. Valve seal insufficient. 2. Cylinder/ring wear outside tolerance.	1. Overhaul the cylinder head. 2. Restore correct operating clearances.
7	TIMING CHECK	All OK	Problems encountered	Operation
	Check that the timing is correct	Go to Step 8	Timing not correct.	Restore the correct timing
8	PRESSURE READING CHECK	All OK	Problems encountered	Operation
	Check the pressure from the manifold pressure sensor by connecting the diagnostic equipment	Go to Step 10	Pressure value incorrect	Go to Step 9
9	INTAKE PRESSURE SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the intake pressure sensor is working properly by carrying out the See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSOR	Go to Step 10	Intake pressure sensor not working properly.	Replace the intake pressure sensor Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
10	ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine management control unit is working properly.	End of diagnosis	Engine management control unit faulty.	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

ABOVE UPPER LIMIT

		Test results
1	ELECTRICAL CONNECTIONS CHECK	All OK	Problems encountered	Operation
	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	WIRING CONTINUITY CHECK	All OK	Problems encountered	Operation
	Check for breaks in the wiring continuity See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	WIRING INSULATION CHECK	All OK	Problems encountered	Operation
	Check the condition of the wiring insulation	Go to Step 4	Wiring insulation faulty.	Restore correct wiring insulation.
4	EARTH CONNECTIONS CHECK	All OK	Problems encountered	Operation
	Check the condition of the earth connections.	Go to Step 5	Breaks in the wiring continuity.	Restore the correct earth connections.
5	CHECK FOR SEEPAGE IN INTAKE MANIFOLD	All OK	Problems encountered	Operation
	Check for any seepage in the intake manifold	Go to Step 6	Seepage inside the intake manifold.	Restore correct operation
6	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	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 8
7	CHECK ON CYLINDER HEAD GASKET AND VALVE OIL SEALS	All OK	Problems encountered	Operation
	Check: that the cylinder head is correctly tightened; the seal of the gasket; the seal of the valve oil seals.	Go to Step 8	1. Cylinder head tightening not correct. 2. Gasket damaged. 3. Oil seal compromised.	1. Restore the correct cylinder head tightening. 2. Replace the cylinder head gasket Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET 3. Restore the correct oil seal.
8	CAUSE OF INSUFFICIENT COMPRESSION CHECK	All OK	Problems encountered	Operation
	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 9	1. Valve seal insufficient. 2. Cylinder/ring wear outside tolerance.	1. Overhaul the cylinder head. 2. Restore correct operating clearances.
9	TIMING CHECK	All OK	Problems encountered	Operation
	Check that the timing is correct	Go to Step 10	Timing not correct.	Restore the correct timing
10	PRESSURE READING CHECK	All OK	Problems encountered	Operation
	Check the pressure from the manifold pressure sensor by connecting the diagnostic equipment	Go to Step 12	Pressure value incorrect	Go to Step 11
11	INTAKE PRESSURE SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the intake pressure sensor is working properly by carrying out the See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSOR	Go to Step 12	Intake pressure sensor not working properly.	Replace the intake pressure sensor Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
12	ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine management control unit is working properly.	End of diagnosis	Engine management control unit faulty.	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

BELOW LOWER LIMIT

		Test results
1	ELECTRICAL CONNECTIONS CHECK	All OK	Problems encountered	Operation
	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	WIRING CONTINUITY CHECK	All OK	Problems encountered	Operation
	Check for breaks in the wiring continuity See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	WIRING INSULATION CHECK	All OK	Problems encountered	Operation
	Check the condition of the wiring insulation	Go to Step 4	Wiring insulation faulty.	Restore correct wiring insulation.
4	EARTH CONNECTIONS CHECK	All OK	Problems encountered	Operation
	Check the condition of the earth connections.	Go to Step 5	Breaks in the wiring continuity.	Restore the correct earth connections.
5	PRESSURE READING CHECK	All OK	Problems encountered	Operation
	Check the pressure from the manifold pressure sensor by connecting the diagnostic equipment	Go to Step 7	Pressure value incorrect	Go to Step 6
6	INTAKE PRESSURE SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the intake pressure sensor is working properly by carrying out the See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSOR	Go to Step 7	Intake pressure sensor not working properly.	Replace the intake pressure sensor Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
7	ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine management control unit is working properly.	End of diagnosis	Engine management control unit faulty.	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R