| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Turn the ignition ON 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 See table X011 LEAKS IN FUEL FEED SYSTEM |
| 5 | Turn the ignition key OFF.Disconnect the wiring harness connector from the engine control unit See M010 ENGINE MANAGEMENT ECU Turn the ignition key ON.Measure the voltage between Pin 27 (wiring side) 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 Op. 1060G20 ENGINE RPM SENSOR - R.R. |
| 7 | Turn the ignition key OFF.Measure the voltage between Pin 27 (wiring side) of connector B control unit wiring side and Earth, checking it is less than 500 V. See M010 ENGINE MANAGEMENT ECU | Move on to Step 6 |
| 8 | Measure the resistance between Pins 12 and 27 (wiring side) of connector B 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 (wiring side) of connector B control unit wiring side, checking it is less than 200 Ohms. See M010 ENGINE MANAGEMENT ECU | 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 Op. 1060G20 ENGINE RPM SENSOR - R.R. |
| 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 voltageMeasure the voltage between sensor (wiring side) Pins 1 and 2 See K046 RPM SENSOR Start the engine and check the voltage is greater than 0.5 V | Change the rpm sensor Op. 1060G20 ENGINE RPM SENSOR - R.R. |
| 12 | Check that the sensor operates correctly: in particular, check for intermittent contacts, missing teeth, incorrect reference point, incorrect gap position, etc. See K046 RPM SENSOR | Restore correct operation, if necessary, replace the faulty components |
| 13 | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R | |