B12 ENGINE STARTS WITH DIFFICULTY' / WHEN COLD - Alfa - 166 - eLearn

3308585 - B12 ENGINE STARTS WITH DIFFICULTY' / WHEN COLD

When the outside temperature is low, the engine does not start 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 the battery voltage is correct and that it is working properly Then check: the state of the spark plugs and leads the condition of the air intake circuit	Continue to Step 1	Battery discharged	Charge or replace the battery
			Spark plugs dirty or damaged	Clean or replace the spark plugs Op. 5510D10
			Spark plug leads damaged	Replace spark plug leads Op. 5510D14
			Air intake circuit component damaged	Replace component (See Assembly 1048A)
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Verify: that there are no faults in the engine management control unit the plausibility of all the parameters	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	Lack of dialogue with the control unit	Restore connection between the engine management control unit and the diagnostic connector ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT ).
2	CHECKING CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10 .	Continue to Step 3	Compression values not correct	Restore the correct cylinder compression, for example, by checking the seal of the injectors Op. 1056B70 and cylinders (see OVERHAULING ENGINE, Subassembly 1004)
3	CHECKING FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10 .	Continue to Step 4	Pressure not correct	Replace the fuel pump assembly Op. 1040A70
4	CHECK ON FUEL INJECTORS	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other iinstruments) carry out the active diagnosis of the iinjectors.	Continue to Step 5	Injector connections faulty	Restore injector connections with control unit, ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )
		Continue to Step 5	Injectors faulty	Replace the injectors Op. 1056B70
5	HECK ON 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'