3308743 - X01 EXCESSIVE FUEL CONSUMPTION
The engine appears to be 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. |
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
| Check the condition of the air filterCheck the state of the spark plugs | Continue to Step 1 | Filter element dirty or damaged | Replace the filter element Op. 1048A14 | |
| Spark plugs dirty or damaged | Replace the spark plugs Op. 5510D10 | |||
| 1 | CHECKING WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Connect
diagnostic equipment (Examiner or other instruments) to the diagnostic
socket. Verify:
| Continue to Step 2 | An error is detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| Lack of dialogue with the control unit | Restore connection between the engine management control unit and the diagnostic connector ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT ). | |||
| 2 | CHECK ON FUEL 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 E5030 PETROL ENGINE ELECTRONIC MANAGEMENT ) | |
| Injectors faulty | Replace injectors Op. 1056B70 | |||
| 3 | CHECKING FUEL PRESSURE | All OK | Problems met | Operation |
| Check the fuel supply pressure Op. 0510C10 | Continue to Step 4 | Pressure not correct (too high a pressure is indicative of excessive consumption) | Replace the fuel pump assembly Op. 1040A70 | |
| 4 | CHECKING AIR CIRCUIT | All OK | Problems met | Operation |
Verify:
| Continue to Step 5 | Circuit component damaged | Replace component (See Assembly 1048A) | |
| 5 | CHECKING TIMING | All OK | Problems met | Operation |
| Check that the engine timing is correct | Continue to Step 6 | Timing not correct | Restore the correct timing Op. 1032B14 | |
| 6 | HECK ON 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' | |