2751025 - D05 ENGINE DOES NOT PRODUCE BEST PERFORMANCE
.| Results of the tests | ||||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation | ||
|---|---|---|---|---|---|---|
Check, in order:
| Continue to Step 1 | Fault in air intake circuit | Repair the air intake circuit | |||
| Air filter blocked | Replace the filter element Op. 1048A14 | |||||
| Leaks from the diesel pipes | stop the leak | |||||
| Accelerator pedal travel incomplete | Eliminate the cause of the problem | |||||
| Exhaust system obstructed | Replace the defective system component | |||||
| 1 | CHECK TURBOCHARGER ADJUSTMENT | All OK | Problems met | Operation | ||
| Check the operation of the turbocharger as described in the Test See Test 1064BA Check turbo presure | Continue to Step 2 | Actuator does not work correctly | Check the condition of the vacuum circuit and, if necessary, replace the damaged components | |||
| Turbocharger faulty | Replace the turbocharger Op. 1064B24 | |||||
| 2 | CHECKING WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation | ||
Connect the Examiner diagnostic equipment to the diagnostic socket. and check:
| Continue to Step 3 | Presence of error P0093 | Continue to Step 9 | |||
| Simultaneous presence of errors P1191 and P1197 | Continue to Step 11 | |||||
| Simultaneous presence of errors P1194 and P1197 | Continue to Step 11 | |||||
| Presence of error P1191 | Continue to Step 10 | |||||
| Presence of one of the following errors: P1193, P1195, P1196 | Continue to Step 10 | |||||
| Presence of error P0180 | Continue to Step 8 | |||||
| Presence of error P0168 | Continue to Step 8 | |||||
| Presence of one of the following errors: P0101, P1102 | Continue to Step 4 | |||||
| Presence of error P1237 | Continue to Step 4 | |||||
| Presence of one of the following errors: P0120, P0220, P0226 | Continue to Step 6 | |||||
| Presence of error P0504 | Continue to Step 7 | |||||
| Presence of error P0400 | Continue to Step 5 | |||||
| Presence of other errors | Continue according to the instructions for the diagnostic equipment | |||||
| 3 | ROAD TEST WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation | ||
ROAD
TEST WITH DIAGNOSTIC EQUIPMENT
check
| Continue to Step 4 | Presence of error P0093 | Continue to Step 9 | |||
| Simultaneous presence of errors P1191 and P1197 | Continue to Step 11 | |||||
| Simultaneous presence of errors P1194 and P1197 | Continue to Step 11 | |||||
| Presence of error P1191 | Continue to Step 10 | |||||
| Presence of one of the following errors: P1193, P1195, P1196 | Continue to Step 10 | |||||
| Presence of error P0180 | Continue to Step 8 | |||||
| Presence of error P0168 | Continue to Step 8 | |||||
| Presence of one of the following errors: P0101, P1102 | Continue to Step 4 | |||||
| Presence of error P1237 | Continue to Step 4 | |||||
| Presence of one of the following errors: P0120, P0220, P0226 | Continue to Step 6 | |||||
| Presence of error P0504 | Continue to Step 7 | |||||
| Presence of error P0400 | Continue to Step 5 | |||||
| Presence of other errors | Continue according to the instructions for the diagnostic equipment | |||||
| 4 | CHECK FLOW METER | All OK | Problems met | Operation | ||
| Using an Examiner, check that the sensor is working properly by carrying out the test See Test 1060GB Check on operation of air flow meter | Continue to Step 5 | Debimeter signal incorrect | Replace the flow meter | |||
| 5 | CHECK EGR | All OK | Problems met | Operation | ||
With an Examiner connected to the tester output, perform:
| Continue to Step 6 | EGR wiring broken | Restore correct operation See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |||
| EGR valve fault | Replace EGR Op. 1080C74 | |||||
| EGR system mechanical fault | Restore correct operation | |||||
| 6 | CHECK ACCELERATOR PEDAL POTENTIOMETER | All OK | Problems met | Operation | ||
| Check the correct operation of the accelerator pedal potentiometer as described in the test See Test 1068AB Check operation of accelerator pedal potentiometer | Continue to Step 7 | Anomalous potentiometer operation | Replace potentiometer | |||
| Electrical wiring defective | Renew the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |||||
| 7 | CHECK ON BRAKE PEDAL SWITCH | All OK | Problems met | Operation | ||
| Check the operation of the brake pedal switch (using the tester to check the status of the relevant parameter has changed correctly) | Continue to Step 8 | Brake pedal does not return | Eliminate the cause of the sticking | |||
| Switch stuck in closed position | Replace the switch Op. 1060G38 | |||||
| Wiring short circuited | Restore the correct connection | |||||
| 8 | CHECK DIESEL HEATING SYSTEM | All OK | Problems met | Operation | ||
| Check the condition of the heating system and record the temperature of the diesel fuel and the condition of the wiringPerform active diagnosis on the diesel filter heater | Continue to Step 9 | System fault | Restore correct operation | |||
| Wiring faulty | Renew the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |||||
| 9 | HIGH RESSURE CIRCUIT CHECK | All OK | Problems met | Operation | ||
| Check the condition of and that there are no leaks from the rail, the radial jet pump, the injector pipes and all the high pressure lines. | Continue to Step 10 | There are leaks | Eliminate leaks from the system | |||
| 10 | HIGH PRESSURE CHECK | All OK | Problems met | Operation | ||
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket;
| Continue to Step 18 | Sensor faulty | Replace sensor. | |||
| Pressure regulator faulty | Replace the pressure regulator | |||||
| Pressure not correct | Continue to Step 11 | |||||
| 11 | CHECK ON RETURN LOW PRESSURE | All OK | Problems met | Operation | ||
| Check as described in the test See Test 1060A Low return fuel pressure circuit check that the pressure in the return pipe to the tank is under 1 bar | Continue to Step 12 | Pressure above maximum limit: return pipe to tank blocked | Repair the pipe, if necessary, replace it. | |||
| 12 | LOW SUPPLY PRESSUR CHECK | All OK | Problems met | Operation | ||
| Check as described in the test See Test 1060B Low fuel pressure supply circuit check that the diesel pressure between filter and pressure pump is between 2 and 3 bar | Continue to Step 18 | Pressure below minimum limit or above maximum value | Continue to Step 13 | |||
| 13 | LOW SUPPLY PRESSUR CHECK | All OK | Problems met | Operation | ||
| Choke the return pipe and repeat the test See Test 1060B Low fuel pressure supply circuit check with the pipe choked, checking that the pressure at the filter outlet remains below 2 bar | Continue to Step 14 | Pressure rises to 5 bar: blocked pressure regulation valve on filter support | Replace the valve Op. 1044B16 | |||
| 14 | CHECK DELIVERY LOW PRESSURE | All OK | Problems met | Operation | ||
| Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Continue to Step 15 | Difference in pressure greater than 1 bar | Replace the fuel filter cartridge Op. 1044B20 | |||
| 15 | LOW SUPPLY PRESSUR CHECK | All OK | Problems met | Operation | ||
| Check that the pressure downstream of the supply pump is over 2.2 bar | Continue to Step 18 | Pressure below | ||||
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