| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS | 
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| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check the following, in order: the the CODE fault message is not present at the matrixthat the inertia switch has not been operated
 | Move on to Step | 1. CODE fault message present at the matrix | 1. Continue following the instructions in Table K108    Continue following the instructions in the table   K108  DISPLAY OF FAULT CODES ON MATRIX - ENGINE STARTS | 
| 2. Intertia switch operated | 2. Restore correct operation | 
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | 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 | 1. Error detected in the control unit | 1. Continue following the instructions in the diagnostic table | 
| 2. Parameters not plausible | 2. Continue following the instructions in the diagnostic table | 
| 2 | FUEL PUMP ACTIVATE DIAGNOSIS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Carry out the active diagnosis of the fuel pump and check that it is working properly | Move on to Step | Pump not working | Move on to Step | 
| 3 | PETROL PUMP ELECTRIC CIRCUIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check petrol pump supply and earth (Wiring Diagram    )  E5030  PETROL ENGINE ELECTRONIC MANAGEMENT | Move on to Step | 1. Connections not correct | 1. Repair the connections (Wiring Diagram    )  E5030  PETROL ENGINE ELECTRONIC MANAGEMENT | 
| 2. Pump faulty | 2. Replace the petrol pump    See in Op.   1040A70  SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R. | 
| 4 | SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that the fuel pressure is correct    See in Op.   0510C10  FUEL SYSTEM - Check DELIVERY PRESSURE | Move on to Step | 1. Pressure not correct: front pipe obstructed | 1. Eliminate the obstructions. If necesssary, replace the pipe | 
| 2. Pressure not correct: fuel pump assembly faulty | 2. Replace the pump assembly    See in Op.   1040A70  SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R. | 
| 5 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that the fault is no longer present |  | Fault persists control unit defective | Replace the engine management control unit    See in Op.   1056B82  Injection/ignition system CONTROL UNIT (one) - R.R. |