B10 ENGINE DOES NOT START / UNDER NO CIRCUMSTANCES - Alfa - 156 - eLearn

3233003 - 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 to the Avv position, 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;If there is a fault in the reconfigurable matrix the CODE failure message comes on.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	First check that there is fuel in the tank and whether the inertia switch has intervened Then 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 I.E. AND CODE FAILURE WARNING LIGHTS	All OK	Problems met	Operation
	Place the key in the ON position and check that: the i.e. failure warning light comes on for about 4 seconds and then goes out. the CODE warning light comes on for less than a second and then goes out	Continue to Step 2	The i.e. warning light comes on and remains on	See table K50
			The CODE warning light comes on and remains on	See table K52
			Both the warning lights come on and remain on	See table K56
			The i.e. failure warning light does not come on	See table K53
			The CODE warning light does not come on	See table K55
2	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 faults in the engine management control unit the plausibility of all the parameters.	Continue to Step 3	An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment
		Continue to Step 3	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 ).
3	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 4	Pressure not correct: fuel filter faulty	Replace the fuel filter Op. 1044B10
			Pressure not correct: electric pump faulty	Replace the electric pump Op. 1040A74
			Pressure not correct: low pressure pipes faulty	Replace the low pressure pipes (see Assembly 1060F)
4	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 5	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)
5	CHECK 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'

The engine does not start. When the key is turned, the instruments light up, the starter motor turns to the Avv position, 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;If there is a fault in the reconfigurable matrix the CODE failure message comes on.

Results of the tests

PRELIMINARY CHECKS

All OK

Problems met

Operation

Turn the ignition on and check that the initial test on engine check and CODE warning lights is carried out

The engine check warning light should come on for about 1 second and then go out, while the CODE warning light should come on for about 4 seconds and then go out

Check

that the inertia switch has operated;
that there is fuel in the tank
air intake circuit;
correct operation of the flow modulating valve;
correct operation of the exhaust pipes.

Continue to Step 1

The code light remains on

See table K52 CODE FAILURE WARNING LIGHT ON

The engine check warning light does not carry out the initial test

See table K53 I.E. FAILURE WARNING LIGHT OFF

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

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 wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Solenoid not working

Replace the solenoid valve Op. 1060G56

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

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 faults in the engine management control unit
the plausibility of all the parameters.

Continue to Step 4

An error is detected in the control unit

Continue according to 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 the engine management control unit and the diagnostic connector.

HIGH PRESSURE CHECK

All OK

Problems met

Operation

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck as described in test 1060D that the diesel pressure parameter is correct.

Continue to Step 12

Pressure not correct

Continue to Step 5

LOW PRESSURE CHECK

All OK

Problems met

Operation

Check as described in test 1060A that the pressure in the return pipe to the tank is under 1 bar

Continue to Step 6

Pressure above maximum limit: return pipe to tank (front section) blocked)

Repair the pipe (front section), if necessary replace it Op. 1040B54 , end of diagnosis

Pressure above maximum limit: return pipe to tank (rear section) blocked

Repair the pipe (rear section), if necessary replace it Op. 1040B56

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