Check that the fuel cut off has not been activated

Check the following, in order:

• presence of fuel in the tank;
• engine control unit correctly fastened to earth;
• battery correctly fastened to earth;
• positive battery terminal and all leads connected to it correctly fastened
• no impurities/water in the fuel tank
• no obstructions in the air intake circuit

1. Fuel cut off activated

2. No fuel

3. Fastening slack or oxidized

4. Presence of dirt in the fuel tank

5. Circuit obstructed

1. Restore correct operation by carrying out the

See Test

2. Add fuel to the tank

3. Restore correct fastenings

4. Introduce fuel into the tank, clean the tank and pipes and replace the filter element

5. Restore to correct operation.

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

1. Error detected in the control unit.

2. Impossible to activate a dialogue with the control unit

1. Continue following the instructions on the diagnostic equipment

2. Move on to Step 2

Check that the engine control unit is receiving the correct power supply

Check the continuity of the supply wiring

Check the continuity of the engine compartment control unit fuses

See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

1. Main relay defective

2. Control unit power supply wiring defective

3. Power supply fuses blown

1. Replace the relay

2. Restore correct wiring.

3. Replace the blown fuses after having ascertained the cause of the problem

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

1. The sudden onset of errors in the control unit is detected

2. Parameters off the scale.

3. Loss of dialogue between the control unit and the diagnostic equipment.

1. Continue following the instructions on the diagnostic equipment

2. Continue following the instructions on the diagnostic equipment

3. Restore the correct connections.

Check the continuity of the supply wiring

Check that the ignition coils are working by carrying out the

See Test 5510CI IGNITION COIL OPERATION CHECK

1. Power supply wiring to coils broken

2. Defective coils.

1. Restore correct wiring.

2. Replace coils

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

Check the continuity of the supply wiring

See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

Carry out a road test and check the fuel supply pressure in the conditions in which the problem occurs.

Check that the fuel lines are not blocked

Check that the fuel pump is working properly by carrying out the

See Test 1040AB SUBMERGED FUEL PUMP CHECK

1. Fuel pressure too low: pipes obstructed

2. Fuel pressure too low: pump defective.

1. Eliminate the constrictions, replace the pipes if necessary

2. Replace the fuel pump assembly

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

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.

Also check:

• Wiring on engine correctly fastened to earth;
• Battery correctly fastened to earth;
• Positive battery pole and all leads connected to it are correctly fastened
• Fuel Cut Off intervention
• Presence of fuel in the tank
• Air filter blocked
• Fuel filter blocked

1. Supply fastenings slack or oxidized

2. Earth fastenings slack or oxidized

3. Inertia switch operated

4. Lack of fuel in the tank

5. Air filter blocked

6. Fuel filter blocked

1. Restore correct fastenings

See E1010 POWER SUPPLY

2. Restore correct fastenings

See E1010 POWER SUPPLY

3. Carry out the

See Test

4. Refill with fuel

5. Replace the air filter

Op. 1048A10 AIR FILTER ASSEMBLY - R.R.

6. Replace the fuel filter

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

Check that the engine control unit is receiving the correct power supply

Check that the main relay is working correctly

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

1. Engine control unit power supply not correct

2. Main relay defective

1. Restore the control unit power supply

2. Replace main relay

Check the operation of the timing sensor, by carrying out the

See Test 1060GC TIMING SENSOR OPERATION CHECK

Check the wiring continuity

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

1. Sensor faulty

2. Wiring faulty

1. Replace timing sensor

Op. 1060G22 CAM ANGLE SENSOR - R.R

2. Restore correct wiring

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Check the operation of the rpm sensor, by carrying out the

See Test 1060GI ENGINE SPEED CHECK

Check the wiring continuity

1. Sensor faulty

2. Wiring faulty

3. Phonic wheel damaged

1. Replace the rpm sensor

Op. 1060G20 ENGINE RPM SENSOR - R.R.

2. Restore correct wiring

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

3. Replace the phonic wheel and reset the parameters in the control unit using the Examiner

Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another, carrying out the

See Test 1060OC INJECTOR SEAL TEST

Replace the injector

Op. 1060F10

Check that the high pressure diesel parameter is correct, carrying out the

See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK

Check using the

See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK

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

See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK

that the supply pump pressure at the filter inlet is correct.

Check that the pump power supply voltage is correct

Check that the pump demand is correct, carrying out the

See Test 1040AA

1. Voltage lower than 12 Volts

2. Pump demand value incorrect

1. Renew electrical wiring

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

2. 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

, if the previous checks have not achieved results, and check that the fault is no longer present