22 · Diagnostics

Excessive fuel consumption

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Consumption /leaks/ wear › Excessive fuel consumption

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Fault diagnosisExcessive fuel consumption

EXCESSIVE FUEL CONSUMPTION

The engine appears to running smoothly, but the fuel consumption is higher than previously recorded during the life of the vehicle.

The consumption data in the vehicle technical documentation has been defined during the course of homologation tests. These tests simulate an urban cycle and an 'average' extra-urban cycle and therefore may not be indicative as consumption depends very much on the style of driving.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the air filter Check the state of the spark plugs	Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
		Continue to Step 1	Filter element dirty or damaged	Replace the spark plugs Op. 5510D10
1	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	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 the connection between the engine management control unit and the diagnostic connector See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
2	CHECK ON INJECTORS	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	Continue to Step 3	Injector connections faulty	Restore the connection of the injectors with the control unit See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 3	Injector connections faulty	Replace the injectors Op. 1056B70
3	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10	Continue to Step 4	Pressure not correct (too high a pressure is indicative of excessive consumption)	Replace the fuel pump assembly Op. 1040A70
4	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check the condition and seal of the air supply circuit	Continue to Step 5	Circuit component damaged	Replace the component
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

The engine appears to running smoothly, but the fuel consumption is higher than previously recorded during the life of the vehicle.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the conditions: of the air filter of the fuel filter	Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
		Continue to Step 1	Fuel filter dirty	Replace the fuel filter Op. 1044B10
1	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	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 the connection between the engine management control unit and the diagnostic connector See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
2	EXHAUST PIPES CHECK	All OK	Problems met	Operation
	Check the exhaust circuit, paying special attention to any obstructions in the pipes	Continue to Step 3	Exhausts obstructed	Replace the component involved
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

BIPOWER

The engine appears to running smoothly, but the fuel consumption is higher than previously recorded during the life of the vehicle.

0	PRELIMINARY CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that there are no methane leaks from the system Check that the manual valves on the canisters are all open Check whether the self-adjustment parameters have been reset after a servicing operation	Continue to Step 1	Methane leak detected from a connector	Restore the correct seal
			One manual valve is closed	Open the manual valve
			Self-adjustment parameters have not been zeroed	Use the Examiner to reset the self-adjustment parameters
1	CHECK ON EFFICIENCY OF SOLENOID VALVE WIRING	All OK	Problems met	Operation
	Using the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the METHANE engine management control unit: in active diagnosis mode: that the solenoid valves on the canisters are working properly	Continue to Step 2	Solenoid valve wiring at the methane canister defective	Restore continuity
		Continue to Step 2	Solenoid valve supply interrupted	Restore power
2	CHECK ON SOLENOID OPERATION	All OK	Problems met	Operation
	Check that the methane cut out solenoid valves are working properly by carrying out Test See Test 1042AA Check on operation of methane cut out solenoid valve coil on canisterand See Test 1042AB Check on operation of methane cut out solenoid valve on canister	Continue to Step 3	Solenoid valve defective	Replace the solenoid valve
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis		Search for the fault starting from another symptom'

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