Connect using the Examiner in the engine control unit and

Check the value of the following parameters:

• Battery voltage
• Accelerator pedal
• Accelerator position 1 AD/C
• Accelerator position 2 AD/C

1. Battery voltage low

2. Accelerator pedal potentiometers defective

1. Recharge/replace battery

2. Replace the accelerator pedal

Op. 1068A14

Check that the motorized throttle is working properly, carrying out

See Test 1056BW THROTTLE BODY ACTUATOR OPERATION CHECK

Check the continuity of the wiring between the engine control unit and the motorized throttle

See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

1. Motorized throttle defective

2. Wiring defective

1. Replace the motorized throttle

Op. 1056B14

2. Restore correct wiring.

Carry out the cylinder compression check

Op. 0520G15

Carry out

Op. 1016C10

to check the valve seal and the condition of the cylinders/piston rings

Overhaul the cylinder head

Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL

Replace the engine management control unit

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

Check:

• Leaks from intake ducts after the compressor
• Air filter blocked
• Ducts blocked
• Diesel filter blocked
• Leaks from the low pressure circuit

1. Leaks from the intake manifolds

2. Air filter blocked

3. Ducts blocked

4. Diesel filter blocked

5. Leaks from the low pressure circuit

1. Restore seal for ducts

2. Replace air filter

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

3. Repair ducts

4. Replace diesel filter

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

5. Restore the correct seal.

Check that the EGR solenoid valve is not stuck open.

Check that the EGR valve is working properly by carrying out the active diagnosis using the Examiner and checking that the valve does not remain open by carrying out

See Test 1080CB

1. Solenoid not working

2. Wiring defective

1. Replace the solenoid valve

Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R

2. Check the continuity of the wiring

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Check that the high pressure value is correct by carrying out

See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK

1. Leaks from high pressure circuit

2. Pressure not correct

1. Restore the correct seal

2. Move on to Step 4

Check that the low pressure value is correct by carrying out

See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK

Using the Examiner check that the fuel pump absorption is correct by carrying out

See Test 1040AA

Replace the electric pump

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

Check that the pressure sensor on the rail is working properly by carrying out

See Test 1060GR FUEL PRESSURE SENSOR ON RAIL OPERATION CHECK

1. Sensor wiring defective

2. Pressure sensor defective

1. Restore correct wiring

2. Replace the pressure sensor

Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R

Check the continuity of the wiring between the engine management control unit and the flow meter.

Check that the flow meter is receiving the correct power supply.

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Check that the flow meter signal is correct using the Examiner and carrying out

See Test 1060GS FLOW METER OPERATION CHECK

1. Air flow meter defective

2. Wiring between flow meter and engine management control unit broken.

3. Flow meter signal too high

1. Replace the flow meter

Op. 1060G10 AIR FLOW METER - R.R.

2. Restore correct wiring.

3. Check the EGR system. Move on to Step 2.

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

See Test 1060OC INJECTOR SEAL TEST

Check that the injectors are working properly by connecting to the engine management control unit in active diagnosis

1. Injector with leaks/poor atomization.

2. Check the continuity of the wiring between the engine management control unit and the injectors.

1. Replace the injector

Op. 1060F10

2. Restore the correct wiring continuity.

Replace the engine control unit

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

and check that the fault is no longer present

Replace the high pressure pump

Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.