| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Connect the Examiner diagnostic equipment to the diagnostic connector and check that there are no system faults at the Engine Management Node. | Move on to Step 2. | Presence of faults in the system | Continue following the instructions given by the diagnostic equipment. |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Keeping the diagnostic equipment connected to the diagnostic socket, check the operation of the M.I.L. warning light at the control panel, by using active diagnosis | Move on to Step 4. | The warning light does not flash. | Move on to Step 3. |
| 3 | WARNING LIGHT OPERATION CHECK | All OK | Problems encountered | Operation |
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| Disconnect the connection cable between the engine control unit and the instrument panel and check that the warning light goes out. | Move on to Step 5. | The warning light does not go out | Replace the Instrument Panel. Op. 5560B10 CONTROL PANEL - R+R |
| 4 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
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| Check the insulation of the MIL warning light control cable between the Engine Management Node and the Instrument Panel Node. | Move on to Step 5. | Cable short circuited to earth. | Restore the correct insulation for the cable. |
| 5 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
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| Check that the fault is no longer present. | End of diagnosis. | The fault persists. | Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |
