| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| First, check:- correct earth fastening on engine;- correct battery earth fastening See E1020 EARTHS - positive battery pole and all leads connected to it correctly fastened See E1010 POWER SUPPLY - no water in the fuel | Move on to Step 1 | Earth leads not correctly fastened | Restore or, if necessary, replace the battery earth lead Op. 5530B22 BATTERY EARTH LEAD - R+R |
| Positive battery lead fastenings not correct | Restore the positive battery lead |
| Water in the fuel | Replace the fuel |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check:- that there are no faults in the engine management control unit;- the plausibility of all the parameters | Move on to Step 2 | Error detected in the control unit | Proceed as instructed by the diagnostic equipment |
| Parameter not consistent | Proceed as instructed by the diagnostic equipment |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|
| Carry out a road test by reproducing the conditions in which the fault occurs, keeping the tester connected.Check:- that there are no faults in the engine management control unit;- the plausibility of all the parameters | Move on to Step 3 | The sudden onset of an error in the control unit is detected | Proceed as instructed by the diagnostic equipment |
| Parameter not consistent | Proceed as instructed by the diagnostic equipment |
| Loss of dialogue between the control unit and the diagnostic equipment | Restore the control unit circuit supply See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT |
| 3 | FUEL PRESSURE ROAD TEST | All OK | Problems encountered | Operation |
|---|
| Carry out a road test and check the fuel supply pressure Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSURE  | Make sure that the conditions in which the problem occurs are reproduced |
| Move on to Step 4 | Pressure not correct: obstructions in the pipe | Remove the obstructions in the fuel pipe, replace it if necessary |
| Pressure not correct: petrol pump damaged | Replace the petrol pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| 4 | CORRECT OPERATION CHECK | 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. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |
