Engine does not start / under no circumstances

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Starting › Engine does not start / under no circumstances

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Fault diagnosisEngine does not start / under no circumstances

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 panel the CODE system failure will be present.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Turn the key to the ON position and check that the I.E and CODE lights come on for the start-up test The I.E light should come on for about 4 seconds and then switch off, while the CODE light should come on for about 1 second and the switch off. Check that the inertia switch has not cut in the state of the spark plugs and leads; that there are no obstructions in the catalytic converter; that there is no water in the fuel	Continue to Step 1	that the I.E light remains on	See table K50 I.E. FAILURE WARNING LIGHT ON
			Both lights remain on	See table K51 I.E. WARNING AND CODE WARNING LIGHT BOTH ON
			The code light remains on	See table K52 CODE FAILURE WARNING LIGHT ON
			The I.E light does not cary out the start-up test	See table K53 I.E. FAILURE WARNING LIGHT OFF
			The CODE light does not carry out the start-up test	See table K54 CODE WARNING LIGHT OFF (INITIAL TEST NOT CARRIED OUT)
			The warning lights do not do the initial test	See table K49 I.E. FAILURE WARNING LIGHT AND CODE WARNING LIGHT BOTH OFF
			Operation of inertia switch	Restore correct operation
			Spark plugs dirty or worn	Replace the spark plugs Op. 5510D10
			Spark plug leads damaged	Replace the cables Op. 5510D14
			Catalytic converter's obstructed	Replace the exhaust manifold Op. 1072C16
			Water in the carburettor	Clean the tank
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket check for errors in the control unit 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	unreliable parameters	Continue following the instructions for the diagnostic equipment
2	ACTIVE TESTING OF FUEL PUMP	All OK	Problems met	Operation
	Carry out active testing of fuel pump and check if it is working properly	Continue to Step 4	Pump not working	Continue to Step 3
3	CHECK PETROL PUMP ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check the petrol pump supply and earth See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 4	Connections not correct	Restore the connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 4	Pump faulty	Replace petrol pump () Op. 1040A70
4	DELIVERY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the fuel pressure is correct Op. 0510C10	Continue to Step 5	Pressure not correct	Eliminate any obstructions in the pipes If necessary, replace the pump assembly Op. 1040A70
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists: control unit faulty	Replace control unit Op. 1056B82 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 panel the CODE system failure will be present.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check, in order: that the i.e. warning light comes on for about 4 seconds and then goes out that the CODE warning light comes on for about 1 second and then goes out that the heater plug warning light comes on and goes out once heating is completed; that the inertia switch has not cut in; that the battery is discharged that the starter motor is working correctly; that the lubricating oil level is correct; Op. 0010T11 that there is no water in the diesel; that there are no fuel leaks; that there are no obstuctions in the catalyzer	Continue to Step 1	that the I.E light remains on	See table K50 I.E. FAILURE WARNING LIGHT ON
			Both lights remain on	See table K51 I.E. WARNING AND CODE WARNING LIGHT BOTH ON
			The code light remains on	See table K53 I.E. FAILURE WARNING LIGHT OFF
			The I.E light does not cary out the start-up test	See table K53 I.E. FAILURE WARNING LIGHT OFF
			The CODE light does not carry out the start-up test	See table K54 CODE WARNING LIGHT OFF (INITIAL TEST NOT CARRIED OUT)
			The warning lights do not do the initial test	See table K55 CODE FAILURE WARNING LIGHT OFF
			After 10 seconds the heater plug warning light flashes for about 30 seconds	See table K45 HEATER PLUGS WARNING LIGHT NOT WORKING
			Battery discharged	Recharge the battery Op. 5530B14
			Battery discharged and cannot be recharged	Replace the battery Op. 5530B10
			Starter motor faulty.	Replace the starter motor Op. 5520B10
			Oil level low	Restore the correct level Op. 0010T11
			Operation of inertia switch	Restore correct operation
			Fuel leak detected	stop the leak
			Catalyzer obstructed	Replace the catalyzer Op. 1080B62
			Water in diesel	Eliminate the water from the diesel
1.9 DIESEL Climatizzatore	Check, in order: that the i.e. warning light comes on for about 4 seconds and then goes out that the CODE warning light comes on for about 1 second and then goes out that the heater plug warning light comes on and goes out once heating is completed; that the inertia switch has not cut in; that the battery is discharged that the starter motor is working correctly; that the lubricating oil level is correct; Op. 0010T11 that there is no water in the diesel; that there are no fuel leaks; that there are no obstuctions in the catalyzer	Continue to Step 1	that the I.E light remains on	See table K50 I.E. FAILURE WARNING LIGHT ON
			Both lights remain on	See table K51 I.E. WARNING AND CODE WARNING LIGHT BOTH ON
			The code light remains on	See table K53 I.E. FAILURE WARNING LIGHT OFF
			The I.E light does not cary out the start-up test	See table K53 I.E. FAILURE WARNING LIGHT OFF
			The CODE light does not carry out the start-up test	See table K54 CODE WARNING LIGHT OFF (INITIAL TEST NOT CARRIED OUT)
			The warning lights do not do the initial test	See table K55 CODE FAILURE WARNING LIGHT OFF
			After 10 seconds the heater plug warning light flashes for about 30 seconds	See table K45 HEATER PLUGS WARNING LIGHT NOT WORKING
			Battery discharged	Recharge the battery Op. 5530B14
			Battery discharged and cannot be recharged	Replace the battery Op. 5530B10
			Starter motor faulty.	Replace the starter motor Op. 5520B12
			Oil level low	Restore the correct level Op. 0010T11
			Operation of inertia switch	Restore correct operation
			Fuel leak detected	stop the leak
			Catalyzer obstructed	Replace the catalyzer Op. 1080B62
			Water in diesel	Eliminate the water from the diesel
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket check for errors in the control unit 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	unreliable parameters	Continue following the instructions for the diagnostic equipment
2	CHECK ON SOLENOID OPERATION	All OK	Problems met	Operation
	Carry out active diagnosis of: flow increase solenoid flow decrease solenoid	Continue to Step 4	Element not working	Continue to Step 3
3	CHECK ON SOLENOID ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check supply and earth of malfunctioning device See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT	Continue to Step 4	Defective Component	Replace faulty component
		Continue to Step 4	Connections not correct	Restore the connections See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
4	CHECK ON PRESENCE OF AIR	All OK	Problems met	Operation
	Check that there is no air in the fuel injection system	Continue to Step 5	Air present	Bleed the air
5	DIESEL FILTER CHECK	All OK	Problems met	Operation
	Check that the diesel filter is not blocked	Continue to Step 6	Diesel filter blocked	Replace the filter Op. 1044B10
6	CHECK ON FUEL INJECTION PUMP TIMING	All OK	Problems met	Operation
	Check the timing of the fuel injection pump Op. 1060A20	Continue to Step 7	Fuel injection pump timing set incorrectly	Restore the correct timing Op. 1060A20
7	REPLACING FUEL INJECTION PUMP	All OK	Problems met	Operation
	Replace the fuel injection pump Op. 1060A10and check that the engine is working properly		The fault persists: control unit defective	Replace control unit Op. 1060D80 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 panel the CODE system failure will be present.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check, in order: that there is no CODE system failure that the inertia switch has not been operated	Continue to Step 1	CODE failure present	See table K52 CODE FAILURE WARNING LIGHT ON
		Continue to Step 1	Operation of inertia switch	Restore correct operation
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check the engine management control unit: for errors in the 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	unreliable parameters	Continue according to the instructions for the diagnostic equipment
2	ACTIVE TESTING OF FUEL PUMP	All OK	Problems met	Operation
	Carry out active testing of fuel pump and check if it is working properly	Continue to Step 4	Pump not working	Continue to Step 3
3	CHECK PETROL PUMP ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check the petrol pump supply and earth See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 4	Connections not correct	Restore the connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 4	Pump faulty	Replace petrol pump () Op. 1040A70
4	DELIVERY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the fuel pressure is correct Op. 0510C10	Continue to Step 5	Incorrect pressure: front pipes obstructed	Remove obstruction If necessary, replace the pipe
	Check that the fuel pressure is correct Op. 0510C10	Continue to Step 5	Incorrect pressure: faulty fuel pump assembly	Replace the pump assembly Op. 1040A70
5	IGNITION OPERATION CHECK	All OK	Problems met	Operation
	Check that the ignition is working properly at the coils by carrying out	End of diagnosis	No spark at more than one coil	Continue to Step 6
		End of diagnosis	No spark at all the coils	Continue to Step 7
6	COIL ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check the continuity of the main circuit of the coils which are not working See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 8	Connections not correct	Restore the connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
7	COIL ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check the continuity of the main circuit of the coils See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 9	Connections not correct	Restore the connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
8	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: coil defective	Replace the defective coils Op. 5510C10
9	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace engine management control unit Op. 1056B82

BIPOWER

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 panel the CODE system failure will be present.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	First check that there is petrol in the tank (since the engine operates on petrol and on methane it always starts up in petrol mode); Check whether the inertia switch has been operated Check, in order: Condition of the petrol pump fuse; That the methane engine management control unit relays are correctly fitted The state of the spark plugs and leads; The condition of the air intake circuit; Possible obstruction in the catalyzer That there is no water, other fluids or dirt in the fuel filter;	Continue to Step 1	Operation of inertia switch	Restore correct operation
			Petrol pump fuse broken	Replace the petrol pump fuse
			Relays not fitted correctly	Refit correctly
			Spark plugs dirty or damaged	Clean or replace the spark plugs
			Spark plug leads damaged	Replace the spark plug leads
			Air intake circuit component damaged	Replace the component
			Catalyzer obstructed	Replace the catalyzer
			Presence of dirt in the fuel filter	Clean the fuel tank
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the petrol and methane engine management control units: in errors ambient in errors ambient: That there are no faults in the petrol engine management control unit that there are no faults in the methane engine management control unit; in parameter mode: The plausibility of all the parameters and that the rpm sensor is working properly	Continue to Step 2	Error detected in the petrol engine management control unit	Continue following the instructions for the diagnostic equipment
			Error detected in the methane engine management control unit	Continue following the instructions for the diagnostic equipment
			Lack of dialogue between the methane and petrol control units	Restore the connection between the methane/Petrol engine management control units and the diagnostic connector
			No connection to earth for the petrol and methane management control units	Restore connection
			RPM sensor fault	Check the continuity/insulation of the wiring and replace the rpm sensor if necessary
2	PETROL INJECTORS CHECK	All OK	Problems met	Operation
	Using the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the petrol engine management control unit: in active diganosis ambient: the operation of the petrol injectors	Continue to Step 3	Petrol injectors connection faulty	Restore the connection between the injectors and the control unit
		Continue to Step 3	Petrol injectors faulty	Replace the petrol injectors
3	CHECK PETROL PUMP ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Using the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the petrol engine management control unit: in active diganosis ambient: the operation of the petrol pump relay	Continue to Step 4	Petrol pump relay faulty	Restore the connections between the fuel pump, relay, engien management control unit, inertia switch
		Continue to Step 4	Petrol pump defective	Replace the petrol pump assembly
4	COIL CHECK	All OK	Problems met	Operation
	Using the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the petrol engine management control unit: in active diganosis ambient: that the coils are working properly Check the operation of the coils	Continue to Step 5	Coils faulty	Replace the ignition coils
			Coil supply not correct	Restore correct supply
			Faulty wiring	Renew the wiring
			Petrol engine management control unit defective	Replace the engine management control unit
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Replace the engine management control unit

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