| 0 | PRELIMINARY CHECK | All OK | Problems encountered | Operation |
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| Check that the engine oil level is correct | Move on to Step 1. | Level not correct. | Top up to the correct oil level |
| 1 | CHECK ON CORRECT OPERATION OF INSTRUMENT PANEL | All OK | Problems encountered | Operation |
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| Check, by connecting to the Examiner, in active diagnosis that the temperature gauge in the instrument panel is working properly | Move on to Step 2. | 1. The fan does not work.2. The indicator does not work correctly. | 1. Replace the instrument panel. Op. 5560B10 CONTROL PANEL - R+R 2. Move on to Step 2. |
| 2 | COOLANT TEMPERATURE SENSOR CHECK | All OK | Problems encountered | Operation |
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| Check that the coolant temperature sensor is working correctly.Check the continuity of the wiring between the sensor and the engine control unit | Move on to Step 3. | 1.Temperature sensor defective2.Sensor wiring interrupted | 1.Replace the sensor. Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R 2.Restore correct wiring. |
| 3 | 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 |