| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the following, in order:- condition of the air intake circuit;
- that there are no faults in the air filter;
- the seal of the diesel pipes;
- no obstructions in the catalytic converter;
- no water, petrol, paraffin or dirt in the tank.
| Move on to Step 1 | Air intake circuit faulty | Repair the air intake circuit |
| Air filter blocked | Replace the filter element Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE. |
| Leaks from diesel pipes | Eliminate the leaks |
| Water, petrol, paraffin or dirt found to be present | Clean the tank and pipes and replace the filter element Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE |
| Catalytic converter obstructed | Replace the catalytic converter Op. 1080B62 CATALYTIC CONVERTER - R + R |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the testert to the tester output.Check:- that there are no errors in the control unit;
- the plausibility of the parameters;
- check operation of accelerator pedal potentiometer
| Move on to Step 2 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment |
| Parameters not plausible | Continue following the instructions for the diagnostic equipment |
| Potentiometer defective | Replace potentiometer Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R R |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected.Check:- that there are no errors in the control unit;
- parameter plausibility
| Move on to Step 3 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment |
| Parameters not plausible | Continue following the instructions for the diagnostic equipment |
| No communication with the control unit | Restore the connection between the engine management control unit and the diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 3 | TURBOCHARGER CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check turbocharger operation as described in Test 1064BA. See Test 1064B CONTROL/SAFETY DEVICES | Move on to Step 4 | Turbocharger faulty | Replace the turbocharger |
| 4 | EGR VALVE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check EGR valve operation following removal Op. 1080C10 E.G.R. VALVE - R + R | Move on to Step 5 | EGR valve blocked open | Replace the EGR valve |
| 5 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | End of diagnosis | Fault persists | Replace the control unit Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R |
| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the following, in order:- condition of the air intake circuit;
- that there are no faults in the air filter;
- the seal of the diesel pipes;
- the accelerator pedal travel;
- no obstructions in the catalytic converter;
- that there is no water, petrol, paraffin or dirt in the tank.
| Move on to Step 1 | Air intake circuit faulty | Repair the air intake circuit |
| Air filter blocked | Replace the filter element Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE. |
| Leaks from diesel pipes | Eliminate the leaks |
| Accelerator pedal does not complete its full travel | Eliminate the cause of the problem |
| Water, petrol, paraffin or dirt found to be present | Clean the tank and pipes and replace the filter element Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE |
| Catalytic converter obstructed | Replace the catalytic converter Op. 1080B62 CATALYTIC CONVERTER - R + R |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the tester to the tester output.Check:- that there are no errors in the control unit;
- parameter plausibility
| Move on to Step 2 | Error detected in the control unit | Continue following the instructions for the tester |
| Parameters not plausible | Continue following the instructions for the tester |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a road test by reproducing the conditions in which the fault occurs, keeping the tester connected.Check:- that there are no errors in the control unit;
- parameter plausibility
| Move on to Step 3 | Error detected in the control unit | Continue following the instructions for the tester |
| Parameters not plausible | Continue following the instructions for the tester |
| No communication with the control unit | Restore the connection between the engine management control unit and the diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 3 | TURBOCHARGER CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check turbocharger operation as described in Test 1064BA. See Test 1064B CONTROL/SAFETY DEVICES | Move on to Step 4 | Turbocharger faulty | Replace the turbocharger |
| 4 | EGR VALVE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check EGR valve operation by sight following removal Op. 1080C10 E.G.R. VALVE - R + R | Move on to Step 5 | EGR valve blocked open | Replace the EGR valve |
| 5 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | End of diagnosis | Fault persists | Replace the control unit Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R |