		Test results
1	CHECK ON CONNECTIONS AT TURBOCHARGING SENSOR AND AT ENGINE MANAGEMENT CONTROL UNIT	All OK	Problems encountered	Operation
	Check for the presence of loose connections at the turbocharging sensor and at the engine management control unit	Go to Step 2	Presence of loose connections	Restore the correct connections.
2	WIRING INSULATION CHECK	All OK	Problems encountered	Operation
	Check that the wiring is correctly insulated.	Go to Step 3	Wiring insulation not correct	Restore correct insulation
3	TERMINALS CHECK	All OK	Problems encountered	Operation
	Check for the presence of oxidised terminals	Go to Step 4	Presence of oxidised terminals.	Restore the correct terminals.
4	TURBOCHARGING SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the turbocharging sensor is working properly See Test 1064BI FUEL SYSTEM RETURN PRESSURE CHECK	Go to Step 5	Turbocharging sensor not working properly	Replace the turbocharging sensor Op. 1056B44 AIR PRESSURE SENSOR - R + R
5	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 not working properly	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

ABOVE UPPER LIMIT

		Test results
1	CHECK ON CONNECTIONS AT TURBOCHARGING SENSOR AND AT ENGINE MANAGEMENT CONTROL UNIT	All OK	Problems encountered	Operation
	Check for the presence of loose connections at the turbocharging sensor and at the engine management control unit	Go to Step 2	Presence of loose connections	Restore the correct connections.
2	WIRING INSULATION CHECK	All OK	Problems encountered	Operation
	Check that the wiring is correctly insulated.	Go to Step 3	Wiring insulation not correct	Restore correct insulation
3	TERMINALS CHECK	All OK	Problems encountered	Operation
	Check for the presence of oxidised terminals	Go to Step 4	Presence of oxidised terminals.	Restore the correct terminals.
4	TURBOCHARGING SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the turbocharging sensor is working properly See Test 1064BI FUEL SYSTEM RETURN PRESSURE CHECK	Go to Step 5	Turbocharging sensor not working properly	Replace the turbocharging sensor Op. 1056B44 AIR PRESSURE SENSOR - R + R
5	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 not working properly	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

SIGNAL NOT VALID

		Test results
1	CHECK ON CONNECTIONS AT TURBOCHARGING SENSOR AND AT ENGINE MANAGEMENT CONTROL UNIT	All OK	Problems encountered	Operation
	Check for the presence of loose connections at the turbocharging sensor and at the engine management control unit	Go to Step 2	Presence of loose connections	Restore the correct connections.
2	WIRING INSULATION CHECK	All OK	Problems encountered	Operation
	Check that the wiring is correctly insulated.	Go to Step 3	Wiring insulation not correct	Restore correct insulation
3	TURBOCHARGING SENSOR OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the turbocharging sensor is working properly See Test 1064BI FUEL SYSTEM RETURN PRESSURE CHECK	Go to Step 4	Turbocharging sensor not working properly	Replace the turbocharging sensor Op. 1056B44 AIR PRESSURE SENSOR - R + R
4	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 not working properly	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R