| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
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| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| First, check:- the condition of the air intake circuit
| Move on to Step | 1. Air intake circuit faulty | 1. Restore the correct operation of the intake circuit |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic test equipment (Examiner or other instruments) to the tester input.Check:- that there are no faults in the engine management control unit;
- parameter plausibility
| Move on to Step | 1. "Fuel system" error detected | 1. Continue following the instructions in Table Z050 |
| 2. Another error detected in the control unit | 2. Continue following the instructions for the diagnostic equipment |
| 3. Parameter not consistent | 3. Continue following the instructions for the diagnostic equipment |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected.Check:- that there are no faults in the engine management control unit;
- parameter plausibility
| | 1. The sudden onset of an error in the control unit is detected | 1. Continue following the instructions for the diagnostic equipment |
| 2. Parameter not consistent | 2. Continue following the instructions for the diagnostic equipment |
| 3 | FUEL PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a road test, reproducing the conditions in which the problem occurs.Check the fuel supply pressure See in Op. 0510C10 FUEL SYSTEM - Check DELIVERY PRESSURE | Move on to Step | 1. Pressure not correct: obstructions in the fuel supply pipe | 1. Remove the obstructions in the fuel pipe, replace it if necessary |
| 2. Pressure not correct: tank not sufficiently ventilated | 2. Restore the tank ventilation |
| 3. Pressure not correct: petrol pump damaged | 3. Replace the petrol pump assembly See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R. |
| 4 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| 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. |