Check glow plug operation
- Make
- Fiat
- Model
- Grande Punto Factory Service Manual
- Year
- 2005–2012
- Section
- Engine starting › Check glow plug operation
CHECK GLOW PLUG OPERATION
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Check that the glow plugs operate correctly | Replace the faulty glow plugs |
| 2 | Turn the ignition key OFF. Disconnect the wiring harness connector from the glow plug control unit Measure 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 6 | Move on to Step 3 |
| 3 | In the engine bay junction unit, remove relay F59 from the base unit (it is the second from left in the bottom row). Measure the voltage between the fuse input contact and earth, checking it is less than 11 V | Repair or if necessary replace the electrical wiring between the junction unit in the engine compartment and the glow plug control unit. |
| 4 | In the engine compartment junction unit, remove fuse F27 (fourth from the top in the left row) Measure the voltage between the fuse input contact and earth, checking it is less than 11 V | Repair or if necessary replace the electrical wiring between the engine compartment junction unit and the battery |
| 5 | Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. The test may be considered completed | |
| 6 | Measure the voltage between Pins 1 and 3 (wiring side) of the control unit, ensuring it is greater than 11 V. | Restore the earth connection of the glow plug control unit or if necessary replace the electrical wiring |
| 7 | Turn the ignition key ON. Measure the voltage between Pin 1 (wiring side) of the control unit and earth, checking that it is less than 0.3 V | Repair or if necessary replace the electrical wiring between the junction unit in the engine compartment and the glow plug control unit. |
| 8 | Select the following control unit at the diagnostic equipment: Diesel electronic injection control unit EDC16C39 CF4/EOBD CAN (EP engine 1.9). Carry out the active diagnosis for the preheating relay, checking that the result is positive. Move on to Step 10 | Move on to Step 9 |
| 9 | If faults are present, repair or if necessary replace the electrical wiring between the glow plug preheating and the engine control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the engine management control unit |
| 10 | Connect a shunt cable without a fuse across control unit Pin 1 (wiring side) and earth. See M015 PLUG PREHEATING CONTROL UNIT Carry out active diagnosis of the preheating relay to check whether it is successful or not | Move on to Step 9 |
| 11 | Turn the ignition key OFF. Disconnect the shunt connection. Disconnect the wiring harness connector from engine control unit connector A See M010 ENGINE MANAGEMENT ECU Turn the ignition key ON. Measure the voltage between Pin 2 (wiring side) of the control unit and earth, checking that it is less than 0.3 V | Repair or if necessary replace the electrical wiring between the engine compartment control unit and the glow plug control unit. |
| 12 | Turn the ignition key OFF. Measure the resistance between Pin 2 (wiring side) of the control unit and earth, checking that it is more than 500 kOhm | Repair or if necessary replace the electrical wiring between the engine compartment control unit and the glow plug control unit. |
| 13 | Measure the resistance between Pin 2 (wiring side) of the control unit and Pin 93 (wiring side) of control unit connector A to ensure it is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine compartment control unit and the glow plug control unit. |
| 14 | Disconnect the wiring harness connector from the first two glow plugs A and B. Turn the ignition key ON. Measure the voltage between Pins 1 and 2 (wiring side) of the control unit and Earth, ensuring it is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the glow plug control unt and the glow plugs |
| 15 | Turn the ignition key OFF. Measure the resistance between Pins 1 and 2 (wiring side) of the control unit and glow plugs A and B (wiring side), ensuring it is less than 5 Ohms. | Repair or if necessary replace the electrical wiring between the glow plug control unt and the glow plugs |
| 16 | Replace the glow plug control unti and ensure the fault disappears. Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R The test can be considered over | Move on to Step 17 |
| 17 | Repair the original glow plug control unit. Disconnect the wiring harness connector from the other two glow plugs C and D. Turn the ignition key ON. Measure the voltage between Pins 3 and 4 (wiring side) of the control unit and Earth, ensuring it is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the glow plug control unt and the glow plugs |
| 18 | Turn the ignition key OFF. Measure the resistance between Pins 3 and 4 (wiring side) of the control unit and glow plugs C and D (wiring side), ensuring it is less than 5 Ohms. | Repair or if necessary replace the electrical wiring between the glow plug control unt and the glow plugs |
| 19 | Replace the engine management control unit |
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Check that the glow plugs operate correctly | Replace the faulty glow plugs |
| 2 | Turn the ignition key OFF. Disconnect the wiring harness connector from the glow plug control unit Measure 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. 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. |
| 5 | Reconnect the wiring harness connector to the glow plug control unit Disconnect 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 in Disconnect 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 unit Connect 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 |
| 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 |
| 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 |
| 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. | Restore the earth connection of the glow plug control unit or if necessary replace the electrical wiring |
| 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. | Repair or if necessary replace the electrical wiring between the junction unit in the engine compartment and the glow plug control unit. |
| 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 |
| 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. | Move on to Step 14 |
| 17 | Turn the ignition key OFF. Disconnect the wiring harness connector from engine control unit connector B Measure the resistance between Pin 6 of control unit wiring connector (wiring side) and Earth, checking it is greater than 500 kOhms. | Repair or if necessary replace the electrical wiring between the engine compartment control unit and the glow plug control unit. |
| 18 | Disconnect the wiring harness connector from the glow plug. 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. | Repair or if necessary replace the electrical wiring between the glow plug control unt and all the glow plugs |
| 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. | Repair or if necessary replace the electrical wiring between the glow plug control unt and all the glow plugs |
| 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. | Repair or if necessary replace the electrical wiring between the glow plug control unt and all the glow plugs |
| 21 | Replace the glow plug preheating control unit |
Parts & tools for this job For 2005 Fiat Grande Punto
- PARTGlow plugsSearch: Fiat Grande Punto 2005 glow plugs
- TOOLGlow plug socketSearch: glow plug socket
- TOOLDiesel compression testerSearch: diesel compression tester
Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.