22 · Diagnostics

Excessive fuel consumption

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: Consumption / leaks / wear › Excessive fuel consumption

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Fault diagnosisExcessive fuel consumption

EXCESSIVE FUEL CONSUMPTION

2.4 JTD 10V

The engine seems to be running smoothly, but the fuel consumption is higher than ever before.

The fuel consumption figures in the technical documentation have been defined during the couse of homologation tests in accordance with directive 93/116/CE.

These tests simulate an urban cycle and an average non-urban cycle and therefore may not be representative as fuel consumption depends a great deal on driving styles.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following conditions: condition of the air filter; the fuel filter. Check the exhaust circuit paying particular attention to any obstructions in the pipes	Move on to Step	1. Filter element dirty or damaged	1. Replace the filter element See in Op. 1048A14 air cleaner filtering element - replace.
			2. Fuel filter dirty	2. Replace the filter element See in Op. 1044B10 fuel filter assembly - r + r or replace
			3. Outlets obstructed	3. Replace the complete exhaust pipe See in Op. 1076B12 exhaust pipe assembly - r+r emission control versions
			4. Exhaust silencers obstructed	4. Replace the silencers
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the engine management node:in errors ambient that there are no faults; in parameters ambient the plausibility of all the parameters.	Move on to Step	Error detected in the control unit	Continue following the instructions for the diagnostic equipment
2	HIGH PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the fuel supply circuit, high pressure side:	Move on to Step	1. Pressure not correct: pressure regulator faulty	1. Replace the pressure regulator See in Op. 1060E50 PRESSURE REGULATOR on pressure pump - R.R.
			2. Pressure not correct: injector manifold faulty	2. Replace the manifold See in Op. 1060F30 SINGLE FUEL MANIFOLD PIPE - R.R.
			3. Pressure not correct: injectors faulty	3. Replace the injectors See in Op. 1060F10 INJECTORS - R.R.
			4. Pressure not correct: pipe from pump to manifold faulty	4. Replace the pipe
			5. Pressure not correct: pipe from manifold to injector faulty	5. Replace the pipe
3	LOW PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the fuel supply circuit, low pressure side:	Move on to Step	1. Pressure not correct: fuel filter faulty	1. Replace the fuel filter See in Op. 1048A10 COMPLETE AIR FILTER -R.R.
			2. Pressure not correct: electric pump faulty	2. Replace the electric pump See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
			3. Pressure not correct: return manifold faulty	3. Replace the manifold See in Op. 1060F50 FUEL RETURN MANIFOLD PIPE - R and R
			4. Pressure not correct: fuel return pipe faulty	4. Replace the pipes concerned
4	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

2.0 TB, 2.4 20V, 3.0 V6

The engine seems to be running smoothly, but the fuel consumption is higher than ever before.

The fuel consumption figures in the technical documentation have been defined during the couse of homologation tests in accordance with directive 93/116/CE.

These tests simulate an urban cycle and an average non-urban cycle and therefore may not be representative as fuel consumption depends a great deal on driving styles.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following conditions: condition of the air filter; Check the exhaust circuit paying particular attention to any obstructions in the pipes	Move on to Step	1. Filter element dirty or damaged	1. Replace the filter element See in Op. 1048A14 air cleaner filtering element - replace.
			2. Outlets obstructed	2. Replace the complete exhaust pipe See in Op. 1076B12 exhaust pipe assembly - r+r emission control versions
			3. Exhaust silencers obstructed	3. Replace the silencers
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the engine management node:in errors ambient that there are no faults; in parameters ambient the plausibility of all the parameters.	Move on to Step	Error detected in the control unit	Continue following the instructions for the diagnostic equipment
2	FUEL PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fuel supply pressure corresponds to the recommended figure See in Op. 0510C10 FUEL SYSTEM - Check DELIVERY PRESSURE	Move on to Step	Pressure not correct: pressure regulator faulty	Replace the fuel pump assembly See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
3	INJECTOR SEAL CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Disconnect the injector ramp from the manifold, disconnect the electrical connections for the injectors, activate the fuel pump in active diagnosis and check that the injectors do not drip at the recommended operating pressure	Move on to Step	One or more injectors leaking	Replace the injector(s) See in Op. 1056B70 INJECTOR (one) - R.R. with fuel manifold pipe removed - Includes seal replacement
4	TIMING CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the valve gear timing is correct	Move on to Step	Timing not correct	Restore the correct timing See in Op. 1032B14 TOOTHED timing BELT - R.R. for timing adjustment or replacement on versions with air conditioning
5	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

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Parts & tools for this job For 2002 Lancia Thesis

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