| 0 | PRELIMINARY CHECK | All OK | Problems encountered | Operation |
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| Check that the engine management warning light is not on with the engine started. | Move on to Step 2. | Warning light on. | Move on to Step 1. |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Connect the Examiner equipment to the diagnostic socket.Check that there are no faults in the Engine Management Node. | Move on to Step 2. | Presence of faults. | Continue as instructed by the diagnostic equipment. |
| 2 | ENGINE TEMPERATURE SENSOR CHECK | All OK | Problems encountered | Operation |
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| Check that the engine temperature sensor is working properly | Move on to Step 3. | Sensor defective. | Replace the temperature sensor. Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R |
| 3 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Keeping the Examiner equipment connected to the diagnostic socket, check the operation of the pointer in the instrument panel in active diagnosis. | Move on to Step 4. | Pointer does not move | Replace the instrument panel. Op. 5560B10 CONTROL PANEL - R+R |
| 4 | ELECTRICAL CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check the insulation of the connection between the engine coolant temperature sensor and the engine management control unit. | Move on to Step 5. | Cables not correctly insulated. | Restore cable insulation. |
| 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 Body Computer. Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R. |