| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Turn the ignition key ON.With the engine switched off and all the consumers switched off, the battery voltage should be between 11 and 13.5 V. | Move on to Step 4 |
| 2 | Turn the ignition key to the STARTING position and check that the battery voltage is more than 8 V | Move on to Step 4 |
| 3 | With the engine idling and warmed up, with all the consumers switched off, the battery voltage should be between 12 and 15 V. The test is considered over | Move on to Step 4 |
| 4 | Start the engine and let it reach a speed of 3000 rpm. Measure the voltage between the positive battery pole and the earth, checking that it is between 13 and 14.8 V See A001 BATTERY | Replace the alternator. Op. 5530A10 ALTERNATOR - R+R |
| 5 | Position the ignition key on STOP. Measure the voltage between the battery positive terminal and Earth, checking it is greater than 11 V. See A001 BATTERY | Carry out See Test 5530BC BATTERY CHARGE CHECK |
| 6 | Turn the ignition ON and switch off all the consumers.Turn the ignition key OFF.Disconnect the wiring harness connector A from the engine control unit See M010 ENGINE MANAGEMENT ECU Turn the ignition key ON and earth Pin 72 of control unit wiring connector A several times. See M010 ENGINE MANAGEMENT ECU Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between pins 1 and 5 of the control unit connector A and earth, checking that it is greater than 11 V. See M010 ENGINE MANAGEMENT ECU Move on to Step 12 | Move on to Step 7 |
| 7 | Turn the ignition key OFF.In the engine compartment junction unit, remove relay T9 from the base unit (in the middle of the lower row) See B001 JUNCTION UNIT Connect a shunt cable with a fuse to Pins 30 and 87 of the base unit.Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between pins 1 and 5 of the control unit connector A and earth, checking that it is greater than 11 V. See M010 ENGINE MANAGEMENT ECU Move on to Step 18 | Move on to Step 8 |
| 8 | Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between pins 30 and 86 of the base unit and earth, checking that it is greater than 11 V.Move on to Step 18 | Move on to Step 9 |
| 9 | In the engine bay junction unit, remove fuse F17 from the base block (fourth from the right in the lower row). See B001 JUNCTION UNIT Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between the fuse input contact and earth, checking that it is greater than 11 V.Move on to Step 11 | Move on to Step 10 |
| 10 | If faults are present, repair or if necessary replace the electrical wiring between the engine compartment junction unit and the battery See E1010 POWER SUPPLY The test can be considered over | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 11 | Replace the engine compartment junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. The test can be considered over | |
| 12 | Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between pins 28 of the control unit connector A and earth, checking that it is less than 11 V. See M010 ENGINE MANAGEMENT ECU | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 13 | Turn the ignition key OFF.In the engine bay junction unit, remove fuse F16 from the base block (third from the right in the lower row). See B001 JUNCTION UNIT Turn the ignition key ON.Connect a (21 W) test bulb and a multimeter in parallel and measure the voltage between the fuse input contact and earth, checking that it is less than 11 V.Move on to Step 15 | Move on to Step 14 |
| 14 | If faults are present, repair or, if necessary, replace the electrical wiring between the engine compartment junction unit and the engine control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 15 | Turn the ignition key OFF.In the engine bay junction unit, remove relay T10 from the base unit (it is the second from left in the bottom row). See B001 JUNCTION UNIT Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between pins 30 of the base unit and earth, checking that it is greater than 11 V. | Move on to Step 10 |
| 16 | Reinsert fuse F16 in the engine compartment junction unit base See B001 JUNCTION UNIT Connect a bridge with a fuse to Pins 30 and 87 of the base unit of relay T10.Connect a (21 W) test lamp and a multimeter in parallel and measure the voltage between pins 11 of the junction unit and earth, checking that it is greater than 11 V. See B001 JUNCTION UNIT | Replace the engine compartment junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 17 | Replace relay T10 Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. The test may be considered completed | |
| 18 | Measure the resistance between Pin 85 of the base unit and Earth, ensuring it is greater than 500 kOhm | Move on to Step 10 |
| 19 | Measure the resistance between Pin 85 of the base unit and Pin 72 of control unit connector A to ensure it is less than 5 Ohms See M010 ENGINE MANAGEMENT ECU Move on to Step 11 | Move on to Step 14 |