| STEP | CHECK TO BE PERFORMED | REMEDIAL ACTION IF THE CHECK IS NOT OK |
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| 1 | Turn the ignition key OFF.Disconnect the cable loom connector from engine management control unit connector AConnect a shunt cable with fuse between pin 28 (wiring side) of control unit connector A See M010 ENGINE MANAGEMENT ECU and the battery positiveand check that the fuel pump does not activate | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
| 2 | In the engine bay junction unit, remove relay T8 from the base (it is the first from the bottom in the right lower row).Measure the voltage between Pin 86 of the base unit and Earth, ensuring it is greater than 11 V. | If faults are found, restore the wiring between the engine management control unit and the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT otherwise replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 3 | Measure the voltage between Pins 85 and 86 of the base unit, ensuring it is greater than 11 V. | If faults are found, restore the wiring between the engine compartment junction unit and earth See E1020 EARTHS otherwise replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 4 | Disconnect the shunt connection cable and turn the ignition ON.Measure the voltage between Pin 30 of the base unit and Earth, ensuring it is greater than 11 V.Move on to Step 8 | Move on to Step 5 |
| 5 | Turn the ignition key OFF.In the engine compartment junction unitremove fuse F30 from the base unit (it is the second from the right in the second row from the bottom).Turn the ignition key ON.Measure the voltage between the fuse input contact and earth, checking it is less than 11 V | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 6 | Turn the ignition key OFF.Disconnect the cable loom connector from connector A of the engine compartment junction unitTurn the ignition key ON.Measure the voltage between pin 16 (wiring side) of control unit connector A See B001 JUNCTION UNIT and Earth, checking it is less than 11 V | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 7 | Turn the ignition key OFF.Restore the wiring between the under-dashboard junction unit and the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | |
| 8 | Connect the shunt connection lead without a fuse between Pins 30 and 87 of the base unit and check that the fuel pump does not come on | Replace the fuel pump relay |
| 9 | Disconnect the cable loom connector from the fuel pumpMeasure the voltage between pump Pin 4 See N040 FUEL PUMP AND LEVEL GAUGE and the Earth, checking it is greater than 11 V | If faults are found, renew the wiring between the engine compartment junction unit and the fuel pump See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT otherwise replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 10 | Check the wiring between the fuel pump and earth See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT and renew if necessary | Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |