2427628 - X01 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 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.
When the engine fuel system selector is set at METHANE, the range is less than it should be
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Check the condition of the air filterCheck the state of the spark plugsContinue to Step 1Filter element dirty or damagedReplace the filter element ( Op.   1048A14  )
Spark plugs dirty or damagedReplace the spark plugs ( Op.   5510D10  )
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck that there are no faults in the engine management control unitContinue to Step 2An error is detected in the control unitContinue following the instructions for the diagnostic equipment
Lack of dialogue with the control unitRestore the connection between the engine management control unit and the diagnostic connector ( See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT )
2CHECK ON INJECTORSAll OKProblems metOperation
Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectorsContinue to Step 3Injector connections faultyRestore the connection of the injectors with the control unit, ( See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT )
Injectors faultyReplace the injector ( Op.   1056B70  )
3CHECK ON FUEL PRESSUREAll OKProblems metOperation
Check the fuel supply pressure ( Op.   0510C10  )Continue to Step 4Pressure not correct (too high a pressure is indicative of excessive consumption)Replace the fuel pump assembly ( Op.   1040A70  )
4CHECKING AIR CIRCUITAll OKProblems metOperation
Check the condition and seal of the air supply circuitContinue to Step 5Circuit component damagedReplace the component
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'