Injector operation check
- Make
- Fiat
- Model
- Grande Punto Factory Service Manual
- Year
- 2005–2012
- Section
- Diesel injection system › Injector operation check
INJECTOR OPERATION CHECK
Proceed as follows on the injector presumed to be faulty.
| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
|---|---|---|
| 1 | Turn the ignition key OFF. Disconnect the wiring harness connector from engine control unit connector B Turn the ignition key ON. Check that the resistance between Earth and:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is less than 0.3 V | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 2 | Turn the ignition key OFF. Check that the resistance between Earth and:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is greater than 500 kOhms Move on to Step 6 | Move on to Step 3 |
| 3 | Disconnect the wiring harness connector from the injector. Check that the resistance between Earth and:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 4 | Check that the resistance between Earth and:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 5 | Replace the injector Op. 1060F10 FUEL INJECTORS - R.R. The test can be considered over | |
| 6 | Disconnect the wiring harness connector from the injector. Check that the resistance across:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is greater than 500 kOhms | Repair or if necessary replace the electrical wiring of the engine control unit |
| 7 | Check that the resistance across pin 1 of the injector and:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 8 | Check that the resistance across pin 2 of the injector and:
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU
See M010 ENGINE MANAGEMENT ECU is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 9 | Check that the resistance across pins 1 and 2 (wiring side) of the injector is between 0.3 and 0.7 Ohms | Replace the injector |
| 10 | Carry out a visual check on the condition of the injector and connector pipes to ensure it is OK | Replace the faulty component |
| 11 | Replace the engine management control unit |
Proceed as follows on the injector presumed to be faulty.
| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
|---|---|---|
| 1 | Turn the ignition key OFF. Disconnect the wiring harness connector from engine control unit connector B Turn the ignition key ON. Check that the resistance between Earth and: - Pins 16 and 47 (wiring side) of the control unit for injector 1 - Pins 17 and 49 (wiring side) of the control unit for injector 2 - Pins 31 and 48 (wiring side) of the control unit for injector 3 - Pins 1 and 46 (wiring side) of the control unit for injector 4 is less than 0.3 V | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 2 | Turn the ignition key OFF. Check that the resistance between Earth and: - Pins 16 and 47 (wiring side) of the control unit for injector 1 - Pins 17 and 49 (wiring side) of the control unit for injector 2 - Pins 31 and 48 (wiring side) of the control unit for injector 3 - Pins 1 and 46 (wiring side) of the control unit for injector 4 is greater than 500 kOhms Move on to Step 6 | Move on to Step 3 |
| 3 | Disconnect the wiring harness connector from the injector. Check that the resistance between Earth and: - Pin 16 (wiring side) of the control unit for injector 1 - Pin 17 (wiring side) of the control unit for injector 2 - Pin 31 (wiring side) of the control unit for injector 3 - Pin 1 (wiring side) of the control unit for injector 4 is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 4 | Check that the resistance between Earth and: - Pin 47 (wiring side) of the control unit for injector 1 - Pin 49 (wiring side) of the control unit for injector 2 - Pin 48 (wiring side) of the control unit for injector 3 - Pin 46 (wiring side) of the control unit for injector 4 is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 5 | Replace the injector Op. 1060F10 FUEL INJECTORS - R.R. The test can be considered over | |
| 6 | Check that the resistance across: - Pins 16 and 47 (wiring side) of the control unit for injector 1 - Pins 17 and 49 (wiring side) of the control unit for injector 2 - Pins 31 and 48 (wiring side) of the control unit for injector 3 - Pins 1 and 46 (wiring side) of the control unit for injector 4 is between 0.3 and 0.7 Ohms Move on to Step 11 | Move on to Step 7 |
| 7 | Check that the resistance across: - Pins 16 and 47 (wiring side) of the control unit for injector 1 - Pins 17 and 49 (wiring side) of the control unit for injector 2 - Pins 31 and 48 (wiring side) of the control unit for injector 3 - Pins 1 and 46 (wiring side) of the control unit for injector 4 is less than 0.3 Ohms. Move on to Step 10 | Move on to Step 8 |
| 8 | Disconnect the wiring harness connector from the injector. Check that the resistance across pin 2 (wiring side) of the injector and: - Pin 16 (wiring side) of the control unit for injector 1 - Pin 17 (wiring side) of the control unit for injector 2 - Pin 31 (wiring side) of the control unit for injector 3 - Pin 1 (wiring side) of the control unit for injector 4 is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 9 | Check that the resistance across pin 1 (wiring side) of the injector and: - Pin 47 (wiring side) of the control unit for injector 1 - Pin 49 (wiring side) of the control unit for injector 2 - Pin 48 (wiring side) of the control unit for injector 3 - Pin 46 (wiring side) of the control unit for injector 4 is less than 5 Ohms See M010 ENGINE MANAGEMENT ECU Move on to Step 5 | Repair or if necessary replace the electrical wiring between the engine control unit and the injector |
| 10 | Disconnect the wiring harness connector from the injector. Check that the resistance across: - Pins 16 and 47 (wiring side) of the control unit for injector 1 - Pins 17 and 49 (wiring side) of the control unit for injector 2 - Pins 31 and 48 (wiring side) of the control unit for injector 3 - Pins 1 and 46 (wiring side) of the control unit for injector 4 is greater than 500 Ohms. See M010 ENGINE MANAGEMENT ECU Move on to Step 5 | Restore the engine control unit wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT If necessary, replace it |
| 11 | Carry out a visual check on the condition of the injector and connector pipes to ensure it is OK | Replace the faulty component |
| 12 | Replace the engine management control unit |
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