Fuel pump relay check
- Make
- Alfa Romeo
- Model
- 159 Factory Service Manual
- Year
- 2005–2011
- Section
- Fuel tank and pipes › Fuel pump relay check
FUEL PUMP RELAY CHECK
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Insert the ignition key (panel on). Check that there is a whilstling noise in the next 2 seconds coming from the fuel pump indicating that it is activated and then the pump should be deactivated. The test can be considered over | Move on to Step 2 |
| 2 | With the diagnostic equipment in active diagnosis carry out the active diagnosis of the fuel pump relay checking that the result is positive Move on to Step 4 | Move on to Step 3 |
| 3 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine management control unit and the engine compartment junction unit. See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the fuel pump relay |
| 4 | Press the START/STOP button (panel off). Connect a pressure gauge to the injectors. Press the START/STOP button (panel on). Check that the fuel pressure rises (whilst the pump is working) between 5.7 and 6.3 bar, then slowly decreases and returns to the previous value. Move on to Step 7 | Move on to Step 5 |
| 5 | Press the START/STOP button (panel off). Remove the fuel pump relay T10 in the engine compartment junction unit. Press the START/STOP button (panel on). Check that the fuel pressure continues not to decrease | Replace the fuel pump relay |
| 6 | If faults are present, repair or, if necessary, replace the electrical wiring between the fuel pump and the engine compartment junction unit. See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the engine compartment junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 7 | Press the START/STOP button (panel off). Remove fuse F21 in the engine compartment junction unit and check that it has not blown. Move on to Step 12 | Move on to Step 8 |
| 8 | Fit a new F21 fuse. Disconnect the connector at the fuel pump See N040 FUEL PUMP AND LEVEL GAUGE and check that there are no short circuits | Restore or, if necessary, replace the electrical wiring |
| 9 | Check the electrical wiring between the fuel pump and the engine compartment junction unit See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT making sure there are no faults present | Restore or, if necessary, replace the electrical wiring |
| 10 | Press the START/STOP button (panel on). Check that the fuel pressure increases and that fuse F21 intervenes | The circuit between the engine compartment junction unit and the fuel pump has been overloaded: check the wiring |
| 11 | If faults are present, repair or if necessary replace the electrical wiring for the fuel pump. See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT Check, amongst other things, that the connectors do not show signs of corrosion or damage. The test can be considered over | Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| 12 | Press the START/STOP button (panel off). Remove the fuel pump relay T10 in the engine compartment junction unit. Press the START/STOP button (panel on). Check the power supply at the base of relay T10 is not faulty | Restore or, if necessary, replace the electrical wiring |
| 13 | Connect a cable and bridge with a 15 A fuse between the battery positive and Pin B of the pump See N040 FUEL PUMP AND LEVEL GAUGE Check that the fuel pressure increases and the pump is activated. Move on to Step 3 | Move on to Step 11 |
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