Engine speed check
- Make
- Alfa Romeo
- Model
- Brera and Spider Factory Service Manual
- Year
- 2005–2010
- Section
- Diesel injection system › Engine speed check
ENGINE SPEED CHECK
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Press the START/STOP and check that the engine rpm does not exceed 60 rpm. | Move on to Step 3 |
| 2 | With the engine idling and warm, with all users off and the accelerator pedal not operated, the engine rpm must be in a range between 770 and 930 rpm. The test may be said to be completed | Move on to Step 3 |
| 3 | Check for the presence of error P0219 – Excessive speed recognition. Continue to Step 5 | Engine rpm is greater than 5400 rpm. Inform the customer that this high engine rpm speed may cause mechanical damage. Continue to Step 4 |
| 4 | Check that the intake system is not contaminated with oil. The test may be considered to be completed | Continue as indicated |
| 5 | Press the START/STOP button and turn off the engine. Disconnect the wiring harness connector from the engine control unit See M010 ENGINE MANAGEMENT ECU Turn the ignition key to the ON position. Measure the voltage between Pin 27 of connector B control unit wiring side and Earth, checking it is less than 0.3 V. See M010 ENGINE MANAGEMENT ECU Move on to Step 7 | Move on to Step 6 |
| 6 | If faults are present, repair or if necessary replace the electrical wiring between the engine control unit and the rpm sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Change the rpm sensor |
| 7 | Press the START/STOP button. Measure the voltage between Pin 27 of connector B control unit wiring side and Earth, checking it is greater than 500 V. | Move on to Step 6 |
| 8 | Measure the resistance between Pins 12 and 27 of control unit wiring side, checking it is in a range between 200 and 3000 Ohms. See M010 ENGINE MANAGEMENT ECU Move on to Step 11 | Move on to Step 9 |
| 9 | Measure the resistance between Pins 12 and 27 of connector B control unit wiring side, checking it is less than 200 Ohms. | Move on to Step 6 |
| 10 | If faults are present, repair or if necessary replace the engine control unit electrical wiring. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Change the rpm sensor |
| 11 | Reconnect the wiring harness connector to the control unit See M010 ENGINE MANAGEMENT ECU Disconnect the wiring harness connector from the rpm sensor. Set the multimeter to measure alternating current voltage Measure the voltage between sensor wiring side Pins 1 and 2 Start the engine and check the voltage is greater than 0.5 V | Change the rpm sensor |
| 12 | Check that the sensor operates correctly: in particular, check for intermittent contacts, missing teeth, incorrect reference point, incorrect gap position, etc. | Restore correct operation, if necessary, replace the faulty components |
| 13 | Replace the engine management control unit |
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