| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
|---|
| 1 | Turn the ignition key OFF.Reconnect any disconnected componentsTurn off all the electrical consumers.Turn the ignition key ON.In the under-dashboard junction unit baseinsert a new fuse F35 (second from the right in the upper row) and check it cuts in.Move on to Step 3 | A temporary current overload has occurred in the system behind fuse F35. move on to Step 2 |
| 2 | If faults are present, restore the correct operation of the under-dashboard control unit wiring.Replace it if necessary.The test can be considered over | Replace the junction unitOp. 5505A18 MULTI-FUNCTION CONTROL UNIT - R R |
| 3 | Turn the ignition key OFF.Disconnect the cable loom from the brake pedal switch.Turn the ignition key ON.Check that fuse F35 does not cut in | Move on to Step 6 |
| 4 | Connect a shunt cable with a fuse between sensor Pin 4 of the switch See I030 BRAKE PEDAL SWITCHand the battery positive See A001 BATTERYCheck the brake lights do not come on | Replace the brake pedal switch Op. 5550D10 BRAKE LIGHT SWITCH - R+R |
| 5 | If faults are present, restore the correct operation of the wiring between the engine control unit and the brake pedal switch See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENTReplace if necessary. The test is complete | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 6 | Turn the ignition key to the OFF position.Disconnect the cable loom connector from the temperature sensor and fuel heating resistanceTurn the ignition key ON.Check that fuse F35 cuts in. | Replace the fuel heater.Op. 1044D10 FUEL HEATER - R + R |
| 7 | Turn the ignition key OFF.Disconnect the cable loom connector from the air flow meter.Turn the ignition key ON.Check that fuse F35 cuts in | Replace the flow meter Op. 1060G10 AIR FLOW METER - R.R. |
| 8 | Check and restore the correct electrical connections between the engine compartment junction unit and components tested See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENTReplace the wiring if necessary | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |