| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Check that the glow plugs operate correctly | Replace the faulty glow plugs Op. 5520C10 HEATER PLUGS - R+R |
| 2 | Turn the ignition key OFF.Disconnect the wiring harness connector from the glow plug control unitMeasure the voltage between Pin 3 (wiring side) of the control unit and Earth, ensuring it is greater than 11 V. See M015 PLUG PREHEATING CONTROL UNIT Move on to Step 11 | Move on to Step 3 |
| 3 | Remove fuse F59 (second from the left in the bottom row) from the engine compartment junction unit and check it has not blown. See B001 JUNCTION UNIT Move on to Step 9 | Move on to Step 4 |
| 4 | Fit a new fuse F59 and check it does not blow. | Repair or if necessary replace the electrical wiring between the junction unit in the engine compartment and the glow plug control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 5 | Reconnect the wiring harness connector to the glow plug control unitDisconnect the wiring harness connector from the first glow plug.Replace fuse F59.Turn the ignition key OFF.Carry out the following active diagnosis on the diagnostic tester: Glow plug preheating control unit relay control.Check that fuse F59 cuts inDisconnect each of the remaining glow plugs consecutively and repeat the check every time | Replace the glow plug Op. 5520C10 HEATER PLUGS - R+R that does not cause the fuse to blow. |
| 6 | Turn the ignition key OFF.Disconnect the wiring harness connector from the glow plug control unitConnect a shunt connection cable without a fuse between Pins 1 and 3 of the control unit wiring connector (wiring side). See M015 PLUG PREHEATING CONTROL UNIT Fit a new fuse F59 and check it does not blow. | Repair or if necessary replace the electrical wiring between the glow plug control unt and the individual glow plugs See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 7 | Disconnect the shunt connection.Connect a shunt connection cable with a fuse between Pins 2 and 3 of the control unit wiring connector (wiring side). See M015 PLUG PREHEATING CONTROL UNIT Fit a new fuse F59 and check it does not blow. | Repair or if necessary replace the electrical wiring between the glow plug control unt and the individual glow plugs See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 8 | Replace the glow plug preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R The test can be considered over | - |
| 9 | Measure the voltage between fuse F59 input contact and earth, checking it is greater than 11 V | Repair or if necessary replace the electrical wiring between the engine compartment junction unit and the battery See E1010 POWER SUPPLY |
| 10 | Repair or if necessary replace the electrical wiring between the junction unit in the engine compartment and the glow plug control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | - |
| 11 | Measure the voltage between Pins 3 and 7 of control unit wiring connector (wiring side), ensuring it is greater than 11 V. See M015 PLUG PREHEATING CONTROL UNIT | Restore the earth connection of the glow plug control unit or if necessary replace the electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 12 | Turn the ignition key ON.Measure the voltage between Pin 8 of the control unit wiring connector (wiring side) and Earth, ensuring it is greater than 11 V. See M015 PLUG PREHEATING CONTROL UNIT | Repair or if necessary replace the electrical wiring between the junction unit in the engine compartment and the glow plug control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 13 | Check that the preheating control unit management status parameter is active on the diagnostic tester.Move on to Step 15 | Move on to Step 14 |
| 14 | Repair or if necessary replace the electrical wiring between the engine compartment control unit and the glow plug control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
| 15 | Connect a shunt cable without a fuse across control unit Pin 9 (wiring side) and earth. See M015 PLUG PREHEATING CONTROL UNIT Check that the preheating control unit management status parameter is inactive on the diagnostic tester. | Move on to Step 14 |
| 16 | Disconnect the shunt connection.Carry out the following active diagnosis on the diagnostic tester: Glow plug preheating control unit relay control.Connect a (3 W) test lamp and a multimeter in parallel and measure the voltage between pins 6 of the control unit wiring connector and the battery positive, checking that it is greater than 11 V. See M015 PLUG PREHEATING CONTROL UNIT | Move on to Step 14 |
| 17 | Turn the ignition key OFF.Disconnect the wiring harness connector from engine control unit connector BMeasure the resistance between Pin 6 of control unit wiring connector (wiring side) and Earth, checking it is greater than 500 kOhms. See M015 PLUG PREHEATING CONTROL UNIT | Repair or if necessary replace the electrical wiring between the engine compartment control unit and the glow plug control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 18 | Disconnect the wiring harness connector from the glow plug. See A040 HEATER PLUGS Turn the ignition key ON.Measure the voltage between glow plug A wiring connector (wiring side) and Earth. Ensure it is less than 0.3 V. See M015 PLUG PREHEATING CONTROL UNIT | Repair or if necessary replace the electrical wiring between the glow plug control unt and all the glow plugs See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 19 | Turn the ignition key OFF.Measure the resistance between glow plug A and C wiring connector (wiring side) and Earth. Ensure it is greater than 500 kOhms. See A040 HEATER PLUGS | Repair or if necessary replace the electrical wiring between the glow plug control unt and all the glow plugs See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 20 | Connect a shunt connection cable with a fuse between Pins 1 and 2 of the control unit wiring connector (wiring side) and the battery positive.Measure the voltage between glow plug A, B, C and D glow plug wiring connector (wiring side) and Earth. Ensure it is greater than 11 V. See A040 HEATER PLUGS See M015 PLUG PREHEATING CONTROL UNIT | Repair or if necessary replace the electrical wiring between the glow plug control unt and all the glow plugs See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 21 | Replace the glow plug preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R | - |