18 · Diagnostics

X01 Excessive fuel consumption

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2002
Section: Consumption / leaks / wear › X01 Excessive fuel consumption

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Fault diagnosisX01 Excessive fuel consumption

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.

NOTA: The consumption data in the vehicle technical documentation has been defined during the course of homologation tests in accordance with directive 93/116/CE. 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.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Check the condition of the air filter Check the state of the spark plugs	OK	Move onto step 1
		Filter element dirty or damaged	Replace the filter element Op. 1048A14 End of diagnosis
		Filter element dirty or damaged	Replace the spark plugs Op. 5510D10 End of diagnosis
1	CHECK WITH DIAGNOSTIC EQUIPMENT Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the engine management control unit	OK	Move onto step 2
		An error is detected in the control unit	Continue following the instructions for the diagnostic equipment End of diagnosis
		Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL End of diagnosis
2	CHECK ON FUEL INJECTORS Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	OK	Move onto step 3
		Injector connections faulty	Restore the connection of the injectors with the control unit Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL End of diagnosis
		Injector connections faulty	Replace injectors Op. 1056B70 End of diagnosis
3	CHECK FUEL PRESSURE Check the fuel supply pressure Op. 0510C10	OK	Move onto step 4
3		Pressure not correct (too high a pressure is indicative of excessive consumption)	Replace the fuel pump assembly Op. 1040A70 End of diagnosis
4	AIR CIRCUIT CHECK Check the condition and seal of the air supply circuit	OK	Move onto step 5
4		Circuit component damaged	Replace the component End of diagnosis
5	CHECK ON CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
5		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev W10 Black smoke at exhaust Next › X05 Excessive oil consumption

Parts & tools for this job For 2000 Alfa Romeo 147

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