| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Connect the Examiner equipment to the diagnostic socket.Check for any faulty control units in the CANCheck that there are no faults at the engine management control unit | Move on to Step 2. | 1. Control unit faulty2. Errors in the control unit | 1.Continue following the instructions for the diagnostic equipment.2..Continue following the instructions for the diagnostic equipment. |
| 2 | CHECK USING THE EXAMINER | All OK | Problems encountered | Operation |
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| Check that the fans are working properly by connecting to the engine management control unit in active diagnosis | End of diagnosis. | 1.Fans defective2.Fan wiring defective | 1.Replace the fans. Op. 1088E10 RADIATOR COOLING FAN - R + R 2.Move on to Step 3 |
| 3 | CONTINUITY CHECK | All OK | Problems encountered | Operation |
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| Check the continuity of the connections between the engine management control unit, fuse control unit and fans. See E5020 ENGINE COOLING Check the operation of the fan control relays. | Move on to Step 4. | 1.Connections not correct.2.Relays defective. | 1.Restore the correct connections.2.Replace the relays. |
| 4 | COOLANT TEMPERATURE SENSOR CHECK | All OK | Problems encountered | Operation |
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| Check that the coolant temperature sensor is working correctly.Check the insulation of the sensor wiring. See E5020 ENGINE COOLING | End of diagnosis. | 1.Temperature sensor defective2.Sensor wiring not correctly insulated. | 1.Replace the sensor. Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R 2.Restore correct wiring insulation. |