Check the following, in order:

- engine control unit correctly fastened to earth;

See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

- battery correctly fastened to earth;

- positive battery terminal and all leads connected to it correctly fastened

- correct connection of the engine control unit connector

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check:

- that there are no errors in the control unit;

- parameter plausibility

Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected and check:

- that there are no errors in the control unit;

- parameter plausibility

- Check the continuity of the supply wiring for the coils

- Check that the ignition coils are working, by carrying out the

See Test 5510CI IGNITION COIL OPERATION CHECK

Replace coils

Op. 5510D10 SPARK PLUGS - R+R

- Check the continuity of the power supply wiring

See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

Replace the engine management control unit

Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

Check that the air intake/vacuum circuit is working properly by carrying out the

See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK

Check the condition of the fuel supply circuit and make sure that it is working properly by carrying out the

See Test 1040OA Fuel supply circuit check

Also check:

· wiring on engine correctly fastened to earth;

· battery correctly fastened to earth;

· positive battery terminal and all leads connected to it correctly fastened

Restore the correct engine oil level

Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY

Restore correct fastenings

See E1010 POWER SUPPLY

Restore correct fastenings

See E1010 POWER SUPPLY

Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.

Check the value of the following parameters:

· Battery voltage

See Test 5530BB BATTERY VOLTAGE CHECK

· Engine rpm

Check that the DPF system is working properly, carrying out the

See Test 1080BE PARTICLE FILTER SATURATION CHECK

Check as described in the

See Test 1060OC INJECTOR SEAL TEST

that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another.

Replace the injector

Op. 1060F10 FUEL INJECTORS - R.R.

Check as described in the

See Test 1060OD Injector high pressure fuel circuit check

that the diesel pressure parameter is correct.

Check as described in the

See Test 1060OA Low pressure fuel return circuit check

that the pressure in the return pipe to the tank is less than 1 bar.

Check as described in the

See Test 1060OB Low pressure fuel supply circuit check

that the diesel pressure between the filter and the pressure pump is between 3.5 and 5 bar

Check using the

See Test

that the difference in pressure upstream and downstream of the filter is less than 1 bar

Replace the fuel filter

Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE

Check as described in the

See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKE

that the pump supply voltage is equal to 12V and that the current uptake is between 2 and 10 A

Renew electrical wiring

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Replace the fuel pump

Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R

Replace the fuel pump

Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R

and clean the fuel tank

Replace the engine management control unit

Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

and check that the fault is no longer present

Check the following, in order:

- engine control unit correctly fastened to earth;

- correct fastening to earth of the battery; - correct fastening of the positive battery pole and all the cables fastened to it

- correct connection of the engine control unit connector

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check:

- that there are no errors in the control unit;

- parameter plausibility

Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected and check:

- that there are no errors in the control unit;

- parameter plausibility

Check the continuity of the supply wiring for the coils

Check that the ignition coils are working, by carrying out

See Test 5510CI IGNITION COIL OPERATION CHECK

See Test 5510CE IGNITION CONTROL SIGNAL CHECK

Replace coils

Op. 5510C14 IGNITION COIL/S - R.R.

- Check the continuity of the power supply wiring

See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

Replace the engine management control unit

Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R