22 · Diagnostics

Excessive fuel consumption

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Consumption /leaks/ wear › Excessive fuel consumption

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Fault diagnosisExcessive fuel consumption

EXCESSIVE FUEL CONSUMPTION

1.9 JTD 16V

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

1.8 T.SPARK

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

1.9 JTD 16V

Warning: The consumption data in the vehicle technical documentation has been defined during the course of homologation tests.

1.8 T.SPARK

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.

1.9 JTD 16V

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.

1.8 T.SPARK

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. Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE.
		Continue to Step 1	Spark plugs dirty or damaged	Replace the spark plugs Op. Op. 5510D10 SPARK PLUGS - R+R
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 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 See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 3	Injectors faulty	Replace the injectors Op. 1056B70
3	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSURE	Continue to Step 4	Pressure not correct (too high a pressure is indicative of excessive consumption)	Replace the fuel pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R
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	End of diagnosis	Fault persists

1.9 JTD 16V

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the conditions: Of the air filter; Of the fuel filter. Check the exhaust circuit, paying special attention to any obstructions in the pipes	Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE.
			Fuel filter dirty	Replace the filter element Op. Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
			Exhausts obstructed	Replace the complete exhaust pipe Op. 1076B12
			Exhaust system obstructed	Replace the defective system component
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the engine conntrol node: For faults in error mode; For plausibility of all parameters in parameter mode;	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
2	HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Check the fuel supply circuit, high pressure side, by carrying out the See Test See Test 1060D ELECTRONIC DIESEL INJECTION CONTROL	Continue to Step 4	Pressure not correct: pressure regulator faulty	Replace the pressure regulator Op. Op. 1060E50 PRESSURE REGULATOR - R R
			Pressure not correct: injector manifold faulty	Replace the manifold Op. Op. 1060F30 FUEL DELIVERY MANIFOLD - R R
			Pressure not correct: injectors faulty	Replace the injectors Op. Op. 1060F10 FUEL INJECTORS
			Pressure not correct: pipe from pump to manifold faulty	Replace the pipe Op. Op. 1060F20 PRESSURE PUMP/MANIFOLD PIPE - R R
			Pressure not correct: pipe from manifold to injectors faulty	Replace the pipe Op. Op. 1060F36 LINES TO INJECTORS - R R
3	LOW PRESSURE CHECK	All OK	Problems met	Operation
	Check the fuel supply circuit, low pressure side supply See Test See Test 1060B LOW FUEL PRESSURE SUPPLY CIRCUIT CHECK and return See Test See Test 1060A LOW RETURN FUEL PRESSURE CIRCUIT CHECK	Continue to Step 4	Pressure not correct: fuel filter faulty	Replace the fuel filter Op. Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
			Pressure not correct: electric pump faulty	Replace the electric pump Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R
			Pressure not correct: return manifold faulty	Replace the manifold Op. Op. 1060F50 FUEL RETURN MANIFOLD - R R
			Pressure not correct: fuel return pipes faulty	Replace the pipes concerned
4	Continue as instructed by the tester	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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