B16 ENGINE STARTS WITH DIFFICULTY' - Alfa - 156 - eLearn

3233007 - B16 ENGINE STARTS WITH DIFFICULTY'

The engine does not start, especially when cold, or it starts with difficulty and only after repeated attempts. When the key is turned the instruments light up, the starter motor turns, but the engine does not start

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: that there is no water, other fluid or dirt in the fuel tank the seal of the fuel pipes and connectors the condition of the air intake circuit	Continue to Step 1	Presence of dirt in the fuel tank	Clean the fuel tank Op. 1040A10
			Fuel pipes damaged	Renew or replace the pipes (see Assembly 1040B)
			Air intake circuit component damaged	Replace the component (see Assembly 1048A)
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	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 plausibility of all the parameters	Continue to Step 2	An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment
		Continue to Step 2	Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector ( See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT ).
2	FUEL PRE-HEATING CHECK	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other iinstruments) carry out the active diagnosis for the fuel pre-heating relay:	Continue to Step 3	Connections broken	Restore the connections between: the fuel pre-heating relay the fuel heater engine management control unit ( See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT )
			Fuel pre-heating not working	Replace the fuel heater Op. 1044D10
			Fuel pre-heating not working properly	Replace the thermal contact Op. 1044D20
3	HEATER PLUGS CHECK	All OK	Problems met	Operation
	Check the operation of the starting system (heater plugs): See Test 5520CA Check on operation of spark plugs	Continue to Step 4	Heater plugs not working	Replace the heater plugs Op. 5520C10
4	LOW PRESSURE CHECK	All OK	Problems met	Operation
	Check the fuel supply circuit, low pressure side: if necessary, use the diagnostic equipment (Examiner) to measure the pressure values	Continue to Step 5	Pressure not correct: fuel filter faulty	Replace the fuel filter Op. 1044B10
			Pressure not correct: electric pump faulty	Replace the electric pump Op. 1040A70
			Pressure not correct: low pressure pipes faulty	Replace the low pressure pipes (see Assembly 1060F)
5	HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Check the fuel supply circuit, high pressure side: for example, using the diagnostic equipment (Examiner) to measure the pressure values	Continue to Step 6	Pressure not correct: pressure pump faulty	Replace the pressure pump Op. 1060E10
			Pressure not correct: manifold faulty	Replace the manifold Op. 1060F30
			Pressure not correct: injectors faulty	Replace the injectors Op. 1060F10
			Pressure not correct: high pressure pipes faulty	Replace the high pressure pipes (see Asembly 1060F)
6	VALVE CLEARANCE CHECK	All OK	Problems met	Operation
	Check that the valve tappet clearance is correct Op. 1036H14 .	Continue to Step 7	Clearance not correct	Restore the correct valve clearance Op. 1036H18 .
7	CYLINDER COMPRESSION CHECK	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 8	Compression values not correct	Restore the correct cylinder compression, for example, checking the seal of the injectors Op. 1060F10 (see OVERHAULING ENGINE, Subassembly 1004)
8	CHECK CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present.	End of diagnosis	Fault persists	Search for the fault starting from another symptom'