| TEST RESULTS |
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the following, in order:- no leaks in fuel circuit;- condition of the air intake circuit;- no obstructions in the catalytic converter;- no water or impurities in the diesel fuel;- fuel filter very blocked | Move on to Step 1 | Fault in the air intake circuit | Renew the air intake circuit |
| Obstruction in the catalytic converter | Replace the catalytic converter Op. 1080B62 CATALYTIC CONVERTER - R + R |
| Water in diesel fuel | Remove water from diesel fuel |
| Leaks in fuel circuit | Eliminate leaks |
| 1 | LOW SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check using the See T CHECK ON CHANGE IN PRESSURE AT THE FUEL FILTERthat the difference in pressure upstream and downstream of the filter is less than 0.5 bar | Move on to Step 2 | Difference in pressure more than 0.5 bar | Replace the fuel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.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 on the diagnostic equipment |
| Implausible parameters | Continue following the instructions on the diagnostic equipment |
| 3 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a road test, keeping the diagnostic equipment connected. | Make sure that the conditions in which the problem occurs are reproduced |
Check:- that there are no errors in the control unit;- parameter plausibility. | End of diagnosis | The sudden onset of errors in the control unit is detected | Continue following the instructions on the diagnostic equipment |
| Parameters off the scale | Move on to Step 4 |
| 4 | ACCELERATOR PEDAL CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Using the Examiner, check that the signal reaches 100% when reading the parameters and goes to the end of travel position | Move on to Step 5 | Accelerator pedal travel incorrect | Restore the accelerator pedal travel |
| Accelerator pedal potentiometer defective | Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R |
| 5 | INJECTOR CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Using the Examiner, check in active diagnosis that all the injectors are working properly. Identify any injector that may be mechanically stuck shut. | Move on to Step 6 | Injector defective | Replace the injector Op. 1060F10 FUEL INJECTORS - R.R. |
| 6 | EGR VALVE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Using the Examiner, check in active diagnosis that the EGR solenoid valve is working properly | Move on to Step 7 | EGR solenoid defective | Replace the EGR solenoid Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R |
| Wiring between solenoid and engine management control unit interrupted | Restore the correct wiring |
| EGR air valve stuck open or throttle mechanically stuck shut | Replace the air valve Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R |
| 7 | BRAKE PEDAL SWITCH CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the brake pedal switch is working properly See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 8 | Brake pedal does not return | Remove the cause of the sticking |
| Switch stuck closed | Replace the switch |
| Wiring short-circuited | Eliminate the cause of the problem See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 8 | ELECTRIC PUMP CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the electric pump is receiving the correct power supply by doing the following: See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKE | Move on to Step 9 | The electric pump is not receiving an electrical power supply because the wiring between the control relay and the electric pump is broken | Restore the correct wiring |
| 9 | AIR FLOW METER OPERATION CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the air flow meter is working correctlyCheck the continuity of the wiring between the air flow meter and the engine management control unit by carrying out the following: See Test 1060GS FLOW METER OPERATION CHECK | Move on to Step 10 | Air flow meter defective | Replace the air flow meter Op. 1060G10 AIR FLOW METER - R.R. |
| Wiring defective | Restore the correct wiring |
| 10 | LAMBDA SENSOR CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the Lambda sensor is working properly by performing the following: See Test 1080BI Check on operation of Lambda sensor heaterand the See Test 1080BA Check on the operation of the upstream Lambda sensor | Move on to Step 11 | Wiring between junction unit and sensor defective | Restore the correct wiring |
| Sensor defective | Replace the sensor Op. 1080B62 CATALYTIC CONVERTER - R + R |
| 11 | CORRECT OPERATION CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | End of diagnosis | The fault persists | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
