| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Fit the key in the ignition.With the engine off and all users off, the Target Turbo Pressure must be within a range between 0.9 and 1.2 bars.Under the same conditions, the Measured Turbo Pressure must be in a range between 0.9 and 1.2 bars and in any case must be approximately equal to external pressure | Move on to Step 6 |
| 2 | With the engine idling and accelerator pedal not operated, the Target Turbo Pressure must be within a range between 0.9 and 1.2 bars.Under the same conditions, the Measured Turbo Pressure must be within a range between 0.9 and 1.2 bars. | Move on to Step 6 |
| 3 | Under the same conditions, overboost valve closure should be in the range beween 70 and 80% | Continue with the test See Test 1064BB CHECK ON OPERATION OF SUPERCHARGING PRESSURE SOLENOID VALVE (PIERBURG) |
| 4 | With the accelerator pedal slightly operated and engine speed equal to 3000 rpm, the Target Turbo Pressure must be within a range between 10 and 23 bars.Under the same conditions, the Measured Turbo Pressure must be within a range between 10 and 23 bars. | Move on to Step 6 |
| 5 | With the accelertor pedal operated several times, overboost valve closure must be less than 70%: the reading should alter quickly.The test can be considered over | Continue with the test See Test 1064BB CHECK ON OPERATION OF SUPERCHARGING PRESSURE SOLENOID VALVE (PIERBURG) |
| 6 | Press the START/STOP button and turn off the engine. Disconnect the wiring harness connector from the fuel pressure sensor.Press the START/STOP button.Measure the voltage between regulator Pins 2 and 1 See N087 FUEL PRESSURE REGULATOR ON RAILEnsure that it is in a range between 4.8 and 5.2 V. | Move on to Step 8 |
| 7 | If faults are present, repair or if necessary replace the electrical wiring between the engine control unit and the sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 8 | Measure the voltage between sensor Pin 3 See K083 FUEL PRESSURE SENSOR and earth. Ensure that it is in a range between 4.9 and 6.0 V. | Move on to Step 7 |
| 9 | With the tester in Parameter mode, display the Measured Turbo Pressure Ensure it is in a range between 4.8 and 5.2 V | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 10 | Connect a shunt cable with a fuse between sensor Pin 3 See K083 FUEL PRESSURE SENSOR and the earth.Check that now the Measured Turbo Pressure is less than 0.3 V | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 11 | Replace the fuel pressure sensor Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R | |