B12 ENGINE STARTS WITH DIFFICULTY' / WHEN COLD - Alfa - 156 - eLearn

3233005 - 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 normally, 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 voltage is correct and that the battery is working properly Then, check: state of the spark plugs and leads condition of the air intake circuit	Continue to Step 1	Battery run down	Recharge or replace the battery
			Spark plugs dirty or damaged	Clean or replace the spark plugs Op. 5510D10
			Spark plug leads damaged	Replace the spark plug leads Op. 5510D14
			Air intake circuit component damaged	Replace component (see Assembly 1048A)
1	CHECK USING 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 the plausibility of all the parameters	Continue to Step 2	Error detected in the control unit	Proceed according to the instructions for the diagnostic equipment
		Continue to Step 2	Failed dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )
2	CYLINDER COMPRESSION CHECK	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, checking the seal of the injectors Op. 1056B70 and the cylinders (see ENGINE OVERHAUL, Subassembly 1004)
3	FUEL PRESSURE CHECK	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	INJECTORS CHECK	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out an active diagnosis for the injectors	Continue to Step 5	Injectors connectino faulty	Restore the injectors connection with the control unit,( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )
		Continue to Step 5	Injectors faulty	Replace injectors Op. 1056B70
5	CORRECT OPERATION CHECK	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'