| 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 broken. | 1. Replace the sensor Op. 1060G14 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. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |