B10 ENGINE DOES NOT START / UNDER NO CIRCUMSTANCES - Alfa - 147 - eLearn

3022565 - B10 ENGINE DOES NOT START / UNDER NO CIRCUMSTANCES

The engine does not start. When the key is turned, the instruments light up, the starter motor turns, but the engine will not start.

The MIL warning light should come on with the ignition on and go out once the engine has started;

The CODE warning light only comes on if there is a fault.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Turn the ignition on and check that the CODE is working properly Check that the inertia switch has not cut in; that there is fuel in the tank air intake circuit; correct operation of the flow modulating valve; correct operation of the exhaust pipes. that there are no leaks from the high- and low-pressure fuel pipes	Continue to Step 1	CODE warning light on	See table K52
			Operation of inertia switch	Restore correct operation
			No fuel	Put fuel in the tank
			Air cleaner dirty or partially blocked	Replace the filter element Op. 1048A14
			Incorrect operation of flow modulating valve	Continue to Step 1
			Exhaust blocked	Repair the exhaust pipes
			There are leaks	Eliminate the leaks
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Carry out active diagnosis of flow modulating solenoid	Continue to Step 2	Solenoid not working	Check the continuity of the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT and if necessary replace the solenoid
2	CHECK ON FLOW MODULATING VALVE ACTUATOR	All OK	Problems met	Operation
	Check operation of pneumatic actuator	Continue to Step 3	Actuator not working	Replace electropneumatically-controlled throttle body Op. 1060G52
3	CHECKING 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 errors in the control unit plausibility of all the parameters	Continue to Step 4	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
			unreliable parameters	Continue following the instructions for the diagnostic equipment
			Lack of dialogue with the control unit	Restore the connection between engine control unit and diagnostic connector
4	HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck that the diesel pressure parameter is correct. See Test 1060D Check high pressure fuel circuit	Continue to Step 15	Pressure not correct	Continue to Step 5
5	INJECTOR HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Check that the diesel leaks from the injector recirculation connections are small and about the same as one another. See Test 1060C Injector high pressure fuel circuit check	Continue to Step 6	Consistent leak from one injector	Replace the injector
6	CHECK ON RETURN LOW PRESSURE	All OK	Problems met	Operation
	Check that the pressure in the return pipe to the tank is less than 1 bar See Test 1060A Low return fuel pressure circuit check	Continue to Step 7	Pressure above maximum limit: return pipe to tank blocked	Repair the pipe; if necessary replace it
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the diesel pressure between filter and pressure pump is between 2 and 3 bar See Test 1060B Low fuel pressure supply circuit check	Continue to Step 13	Pressure below minimum limit or above maximum limit	Continue to Step 8
8	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Choke the return pipe below the valve, checking that the filter outlet pressure remains below 2 bar See Test 1060B Low fuel pressure supply circuit check	Continue to Step 9	Pressure rises to 5 bar: blocked pressure regulation valve on filter support	Replace the valve Op. 1044B16
9	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Continue to Step 10	Difference in pressure greater than 1 bar	Replace the fuel filter cartridge Op. 1044B20
10	CHECK DELIVERY LOW PRESSURE	All OK	Problems met	Operation
	Check that the supply pump pressure at the filter inlet is over 2.2 bar	Continue to Step 13	Pressure below 2.2 bar	Continue to Step 11
11	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Measure the difference in pressure between electric pump outlet and filter inlet and check that it is less than 0.3 bar	Continue to Step 12	Difference in pressure greater than 0.3 bar	Replace the pipe
12	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the pump's supply voltage is 12V and that the absorbed current is between 2 and 10 amp. See Test 1040AA Check supply voltage and absorption current	Continue to Step 13	Voltage < 12 V	Check electric wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Current > 10 Amp: pump defective	Replace the fuel pump assembly Op. 1040A70
			Current < 2 Amp.: pump blocked	Replace the fuel pump assembly Op. 1040A70 and clean the fuel tank
13	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Replace the DRV high-pressure regulating valve and check that the fault is no longer present.	End of diagnosis	Fault persists	Continue to Step 14
14	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Replace the pressure pump and check that the fault is no longer present	End of diagnosis	Fault persists	Contact Technical Service for further information on the problemSearch for the fault starting from another symptom'
15	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Replace the engine management control unit and check that the fault is no longer present	End of diagnosis	Fault persists	Contact Technical Service for further information on the problem