939005355 - 1040AC FUEL LEVEL GAUGE CHECK
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |||
|---|---|---|---|---|
| 1 | Check the fuel level signalled by the gauge in the panel and make a note of it.Connect to the pump connector See N040 FUEL PUMP AND LEVEL GAUGE between Pins A and C and check that the resistance reading is consistent with the reading in the panel, following the instructions in the table below.
| Move on to Step 8 |
| Level | Full | 3/4 | 1/2 | 1/4 | Reserve | Empty |
| Resistance (Ohm) | 20 | 77 | 152,5 | 225 | 259,5 | 300 |
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 2 | Lift up the pump from the tank, checking that the electrical connection and the pipes that go to the second level sensor are correctly connected | Restore the correct electrical and hydraulic connections |
| 3 | Operate the pump and ensure that the fuel level in the tank is less than 1/4 full | Second level sensor and pump system faulty: replace the fuel tank Op. 1040A14 FUEL TANK - R + R FOR REPLACEMENT |
| 4 | Extract the pump from the tank, taking care to disconnect the electrical connection and the pipes that go to the second level sensor.Place the pump on a horizontal surface and short circuit the connection that goes to the disconnected sensor.Check the consistency between the resistance measured at the pump and the height at which the base of the level float finds itself, referring to the table below | Move on to Step 6 |
| Height (mm) | 140÷146 | 92,2÷96,2 | 56,3÷60,3 | 0,4÷4,4 | 0 |
| Resistance (Ohm) | 9,3÷11 | 63,1÷65,1 | 97,2÷100 | 137,3÷140.9 | 139 |
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 5 | Second level sensor and pump system faulty: replace the fuel tank Op. 1040A14 FUEL TANK - R + R FOR REPLACEMENT The test can be considered over | |
| 6 | The level gauge may be fitted incorrectly.Refit the level gauge Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R and move on to Step 4.If the fault persists, replace the gauge | |
| 7 | Check that the reading is now consistent.The test can be considered over | Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| 8 | Carry out the active diagnosis of the fuel level gauge in the instrument panel, checking that the pointer can complete the entire stroke throughout the scale | Replace the instrument panel Op. 5560B10 CONTROL PANEL - R+R |
| 9 | Check that the wiring between Pin 1 of the gauge See N040 FUEL PUMP AND LEVEL GAUGE and Pin 4 of connector D of the Body Computer See M001 BODY COMPUTER does not have continuity or insulation faults | Restore or, if necessary, replace the wiring See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT |
| 10 | Check that the wiring between Pin A of the gauge See N040 FUEL PUMP AND LEVEL GAUGE and Pin 15 of connector D of the Body Computer See M001 BODY COMPUTER does not have continuity or insulation faults | Restore or, if necessary, replace the wiring See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT |
| 11 | Check that the connector for the guage See N040 FUEL PUMP AND LEVEL GAUGE does not show signs of oxidation, deformation or breaks in the pins |