125000497 - D05 ENGINE DOES NOT PRODUCE BEST PERFORMANCE
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
First, check:
| Move on to Step 1 1 | Air intake circuit faulty | Restore intake circuit | |
| Pipe partly obstructed (catalytic converter) | Repair/replace piping | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check:
| Move on to Step 2 1 | Error detected | Continue as instructed by the diagnostic equipment | |
| Parameter not consistent | Analyse the factors that give rise to this inconsistency | |||
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Carry out a road test keeping the diagnostic equipment connected. Check:
| Move on to Step 3 1 | Presence of errors | Continue as instructed by the diagnostic equipment | |
| Parameter not consistent | Analyse the factors that give rise to this inconsistency | |||
| 3 | FUEL LOW PRESSURE CIRCUIT TEST | All OK | Problems encountered | Operation |
| Check the fuel supply pressure Op. Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSUREunder the conditions in which the fault occurs | Move on to Step 4 1 | Fuel pressure too low: pipes obstructed | Eliminate the constrictions | |
| Fuel pressure too low: pump defective | Replace the pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| Pump supply discontinuous | Restore pump supply circuit | |||
| 4 | RAIL PRESSURE SENSOR CHECK | All OK | Problems met | Operation |
| Check the operation of the rail sensor | Continue to Step 5 | Pressure sensor faulty | Replace sensor Op. 1056F54 | |
| 5 | CHECK PRESSURE REGULATOR | All OK | Problems encountered | Operation |
| Check the operation of the pressure regulator | Move on to Step 6 1 | Pressure regulator fault | Replace the pressure regulator Op. 1056F52 | |
| 6 | HIGH PRESSURE PUMP CHECK | All OK | Problems encountered | Operation |
| Check high pressure pump operation | Move on to Step 7 1 | High pressure pump fault | Replace high pressure pump Op. 1056F72 | |
| 7 | INJECTOR CHECK | All OK | Problems encountered | Operation |
| Check continuity/insulation of injector wiring. In particular, check injector pilot signal is present. See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | Move on to Step 8 1 | Signal not present, wiring broken | Restore wiring See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | |
| Signal not present, wiring not broken | Replace the engine management control unit Op. 1056F82 | |||
| 8 | PHASE TRANSFORMER SOLENOID VALVE CHECK | All OK | Problems encountered | Operation |
| Carry out the active diagnosis of the phase transformer solenoid valveCheck the operation of the phase transformer supplying the phase transformer solenoid avlve directly whilst idlingThe engine speed should vary considerably (very irregular idling) | Move on to Step 9 1 | Solenoid valve not working | Check: actuator resistance, wiring condition, control signal from control unit, actuator mechanical lock | |
| 9 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check that the valve gear timing is correctly adjusted Op. Op. 0510A20 TIMING GEAR WITH BELT DRIVE - CHECK - CARRY OUT OPERATION WITH CAM COVER(S) REMOVED AND TAPPETS ADJUSTED | Move on to Step 10 1 | Valve gear timing not correct | Restore the correct valve gear timing Op. Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REPLACEMENT | |
| 10 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
| Carry out the cylinder compression check Op. Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 12 1 | Cylinder compression insufficient | Move on to Step 11 1 | |
| 11 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
- Carry out R/R head [PR_1016C10] to test valve leakage
| Move on to Step 12 1 | Valve seal insufficient | Overhaul the cylinder head Op. Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL | |
| Cylinders/piston rings worn | Restore the seal | |||
| 12 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the control unit Op. 1056F82 | |
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
First, check:
| Move on to Step 1 1 | Air intake circuit faulty | Eliminate the problem, if necessary, replace the filter element Op. Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE. | |
| Pipe obstructed | Restore the operation of the exhaust pipes | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check:
| Move on to Step 2 1 | "Fuel system" error detected | Proceed as instructed in theSee table See table Z50 MIXTURE STRENGTH ERROR | |
| Another error detected in the control unit | Continue following the instructions for the diagnostic equipment | |||
| Parameter not consistent | Continue following the instructions for the diagnostic equipment | |||
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Carry out a road test keeping the diagnostic equipment connected. Check:
| Move on to Step 3 1 | "Fuel system" error detected | Proceed as instructed in theSee table See table Z50 MIXTURE STRENGTH ERROR | |
| The sudden onset of another error is detected | Continue following the instructions for the diagnostic equipment | |||
| Parameters not consistent | Continue following the instructions for the diagnostic equipment | |||
| 3 | FUEL PRESSURE ROAD TEST | All OK | Problems encountered | Operation |
| Carry out a road test and check the fuel supply pressure Op. Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSUREunder the conditions in which the fault occurs | Move on to Step 4 1 | Fuel pressure too low: pipes obstructed | Eliminate the constrictions | |
| Fuel pressure too low: pump defective | Replace the pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| 4 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check that the valve gear timing is correctly adjusted Op. Op. 0510A20 TIMING GEAR WITH BELT DRIVE - CHECK - CARRY OUT OPERATION WITH CAM COVER(S) REMOVED AND TAPPETS ADJUSTED | Move on to Step 5 1 | Valve gear timing not correct | Restore the correct valve gear timing Op. Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REP | |
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