Injector operation check
- Make
- Alfa Romeo
- Model
- Brera and Spider Factory Service Manual
- Year
- 2005–2010
- Section
- Petrol injection system › Injector operation check
INJECTOR OPERATION CHECK
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Using the diagnostic equipment, check that the engine coolant temperature is in a range between 10 and 32 °C | Move on to Step 3 |
| 2 | Disconnect the injector connector and check that the resistance between Pins 1 and 2 is between 11 and 14 Ohm and make a note of the resistance reading. Repeat the test for each injector | Replace the injector Op. 1056F70 INJECTOR ONE R R WITH FUEL MANIFOLD PIPE REMOVED INCLUDES GASKET REPLACEMENT |
| 3 | Subtract the lower value measured from the higher one and check that the difference is more than 3 Ohm | Move on to Step 5 |
| 4 | Calculate the average of the resistance readings and replace the injector Op. 1056F70 INJECTOR ONE R R WITH FUEL MANIFOLD PIPE REMOVED INCLUDES GASKET REPLACEMENT whose resistance value is furthest away from the average figure. The test can be considered over | |
| 5 | Using the diagnostic equipment, check that the engine coolant temperature is less than 94 °C | Wait until the coolant temperature is lower than 94 °C |
| 6 | Check that the fuel tank is at least 1/4 full (reading on the gauge) and add fuel if necessary Press the START/STOP button (panel off). Connect a pressure gauge to the injectors. Press the START/STOP button (panel on). Check that the fuel pressure increases (whilst the pump is working) between 5.7 and 6.3 bar | Continue as instructed in the |
| 7 | Leave the pressure in the rail to stabilize and check that the variation in pressure is less than 0.4 bar from then over the next minute | Continue as instructed in the |
| 8 | Press the START/STOP button (panel off). Connect a 5 V current generator to the terminals of the connector for injector 1 Check that the fuel pressure increases (whilst the pump is working) and make a note of the figure reached. Activate the generator with a current between 0.5 and 2.5 A opening the connector and producing a fall in the rail pressure. Make a note of the new pressure reading. Repeat the test for each injector | |
| 9 | Calculate the falls in pressure for each injector and work out the average. Check that the difference in the fall in pressure is not more than 0.1 bar from the average for any of the injectors | Replace the injector Op. 1056F70 INJECTOR ONE R R WITH FUEL MANIFOLD PIPE REMOVED INCLUDES GASKET REPLACEMENT |
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