323000721 - D001 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT)

There is a (prolonged) drop in performance (flat spots) during acceleration

		Test results
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	First, check:- the condition of the air intake circuit- correct earth connection of the coils and the engine control unit to the engine block    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT - leads properly connected to battery	Move on to Step 1	Air intake circuit faulty	Restore the seal on the air intake circuit
			Engine control unit earth connection on the engine block is defective	Restore the correct earth connection
			Loose cables to the battery	Restore correct tightening
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check:- that there are no faults in the engine management control unit;- parameter plausibility	Move on to Step 2	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
			Parameter not consistent	Continue following the instructions on the diagnostic equipment
2	SHUT OFF BYPASS AIR SOLENOID VALVE CHECK	All OK	Problems encountered	Operation
	Check that the solenoid is working properly by carrying out the    See Test 1064BH CHECK ON OPERATION OF SUPERCHARGING AIR BY-PASS SOLENOID VALVE (SHUT OFF)	Move on to Step 3	Solenoid valve stuck open	Replace the by-pass solenoid valve    Op. 1048B58 TURBOCHARGER AIR BY-PASS VALVE - R.R.
			Wiring from engine control unit to solenoid valve defective	Restore correct wiring
			Signal from engine control unit not correct	Replace the engine control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
3	FUEL PRESSURE CHECK	All OK	Problems encountered	Operation
	Carry out a road test, reproducing the conditions in which the fault occurs.Check the fuel supply pressure by performing the    See Test 1056BY FUEL SYSTEM SUPPLY PRESSURE CHECKand the    See Test 1056BI FUEL SYSTEM RETURN PRESSURE CHECK	Move on to Step 4	Pressure not correct: obstructions in the fuel supply pipe	Remove the obstructions in the fuel pipe, replace it if necessary
			Pressure not correct: tank not sufficiently ventilated	Restore correct tank ventilation
			Pressure not correct: petrol pump damaged	Replace the petrol pump assembly    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
4	AIR/TEMPERATURE PRESSURE SENSOR CHECK	All OK	Problems encountered	Operation
	Check correct operation of the pressure sensor by carrying out the    See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSORCheck the continuity/insulation of the wiring between the sensor and the engine control unit	Move on to Step 5	Wiring between sensor and engine control unit with short circuit or open circuit	Restore correct wiring.
			Sensor defective	Replace the sensor    Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
5	TURBOCHARGING PRESSURE SENSOR CHECK	All OK	Problems encountered	Operation
	Check correct operation of the pressure sensor by carrying out the    See Test 1064BA TURBOCHARGING PRESSURE CHECKCheck the continuity/insulation of the wiring between the sensor and the engine control unit	Move on to Step 6	Wiring between sensor and engine control unit with short circuit or open circuit	Restore correct wiring.
			Sensor defective	Replace the pressure sensor    Op. 1056B44 AIR PRESSURE SENSOR - R + R
6	CANISTER SOLENOID CHECK	All OK	Problems encountered	Operation
	With the Examiner in active diagnosis, check that the canister solenoid is working properlyCheck continuity of wiring between engine control unit and canister solenoid    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 7	Defective canister solenoid	Replace canister solenoid    Op. 1080E28 ENABLEMENT SOLENOID FOR FLOW OF FUEL VAPOUR TO INLET - R+R
			Wiring interrupted	Restore correct wiring
7	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace the engine management control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R