X01 EXCESSIVE FUEL CONSUMPTION - Alfa - 156 - eLearn

3233208 - X01 EXCESSIVE FUEL CONSUMPTION

The engine appears to run 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 in accordance with the directive in force. 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 conditions: of the air filter of the fuel filter	Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
	Check the conditions: of the air filter of the fuel filter	Continue to Step 1	Fuel filter dirty	Replace the filter element Op. 1044B20
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Verify: that there are no faults in the engine management control unit the 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	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
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 (see Assembly 1076B)
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. 1040A70
			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	CHECKING 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'