| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Connect the Examiner diagnostic 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 defective.2. 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 connections2. 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. 2.Sensor wiring not correctly insulated | 1. Replace the sensor Op. 1060G14 ENGINE COOLANT TEMPERATURE SENSOR - R.R. 2. Restore the correct wiring insulation. |