D001 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT) - Fiat - NUOVA 500 - eLearn

312000554 - D001 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT)

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

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	First, check: the condition of the air intake circuit Correct earth connection of the coils and the control unit motor to the engine block See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT Leads properly connected to battery	Move on to Step 1	1. Air intake circuit faulty2. Control unit motor earth connection on the engine block is defective3. Loose cables to the battery	1. Restore the correct seal on the air intake circuit2. Restore the correct earth connection3. 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 and check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step 2	1. Error detected in the control unit2. Parameter not consistent	1. Continue following the instructions on the diagnostic equipment2. Continue following the instructions on the diagnostic equipment
2	FUEL PRESSURE CHECK	All OK	Problems encountered	Operation
	Carry out a road test, reproducing the conditions in which the problem occurs.Check the fuel supply pressure by performing the See Test 1056BY FUEL SYSTEM SUPPLY PRESSURE CHECK	Move on to Step 3	1. Pressure not correct: obstructions in the fuel supply pipe2. Pressure not correct: tank not sufficiently ventilated3. Pressure not correct: petrol pump damaged	1. Remove the obstructions in the fuel pipe, replace it if necessary2. Restore the tank ventilation3. Replace the petrol pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
3	CANISTER SOLENOID VALVE CHECK	All OK	Problems encountered	Operation
	With the Examiner in active diagnosis, check that the solenoid canister is working properlyCheck continuity of wiring between engine control unit and solenoid canister See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 4	1. Defective solenoid canister2. Wiring broken	1. Replace the solenoid Op. 1080E28 ENABLEMENT SOLENOID FOR FLOW OF FUEL VAPOUR TO INLET - R+R 2. Restore correct wiring
4	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