| | Results of the tests |
| 1 | CHECK ON CORRECT OPERATION OF CLIMATE CONTROL NODE | All OK | Problems encountered | Operation |
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| With the engine on and the compressor off, place the control unit in the AUTO function (MONO button off) and adjust the temperature using the passenger side temperature knob moving it from cold to hot. Also select the recirculation button to the closed position and set the fan speed to 3-4 bars (display) and the distribution to front ventilation. Using the diagnostic equipment check that the engine temperature reaches at least 70 °C. Now carry out the operations for checking the passenger compartment cooling function: with the engine on, at ambient temperature of around 20 °C, with the vehicle compressor on, place the control unit to AUTO, adjust the temperature knob from hot to maximum cold LO, the distribution to the front position, the fan speed to 3 bars and the outside air intake function. After about 5 minutes in these conditions, check using the diagnostic equipment that the temperature values for the passenger compartment and evaporator sensors show a decrease: from the initial temperature of about 20 °C (ambient temperature) gradually decreasing to a temperature of around 3.5°C for the evaporator sensor and around 6 °C for the passenger compartment temperature sensor. Feel whether the air coming out of the vents changes (getting colder) in temperature. Then check for any errors relating to the solar sensor. The solar sensor reference values are less than 50 W/mq. | a maximum difference between the driver and passenger selections of 7°C is permitted. |
| End of diagnosis | The temperature of the air coming out of the vents does not get hotter | Move on to Step 2 |
| The temperature of the air coming out of the vents does not get colder | Move on to Step 2 |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Connect the diagnostic equipment and check: - that there are no errors at the passenger side air mixture actuator
- that there are no faults in the outside temperature sensor
- that there are no faults in the passenger compartment temperature sensors
- that there are no faults in the solar sensor
| Move on to Step 3 | Short circuit error at the air mixture actuator | Move on to Step 4 |
| Implausible error at the air mixture actuator | Replace the actuatorOp. 5040D86 AIR CONDITIONING RIGHT HAND AIR MIXER FLAP CONTROL MOTOR - R.R |
| Error at the outside temperature sensor | Move on to Step 4 |
| Error at the passenger compartment temperature sensors | Move on to Step 4 |
| Error at the solar sensor | Move on to Step 4 |
| 3 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Keeping the Examiner diagnostic equipment connected, check the operation of the air mixture actuator through active diagnosis | Move on to Step 4 | Air mixture actuator not working | Replace the actuatorOp. 5040D86 AIR CONDITIONING RIGHT HAND AIR MIXER FLAP CONTROL MOTOR - R.R |
| 4 | ELECTRICAL CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check the continuity/insulation of the electrical connection between the climate control node and the passenger side air mixture actuator and the outside temperature sensor and the passenger compartment sensor and the solar sensor | Move on to Step 5 | Electrical connection broken or not insulated. | Restore the continuity/insulation of the electrical connection See E6020 CONDIZIONATORE |
| Outside temperature sensor not working | Replace the outside temperature sensor Op. 5010D12 OUTSIDE AIR TEMPERATURE SENSOR ON DOOR MIRROR - R+R FOLLOWING ELECTRICAL CIRCUIT CHECK |
| Passenger compartment sensors not working | Replace the passenger compartment temperature sensors |
| Solar sensor not working | Replace the solar sensorOp. 5010D56 SOLAR SENSOR - R.R FOLLOWING ELECTRICAL SYSTEM CHECK |
| 5 | AIR MIXTURE MOTOR FLAP CHECK | All OK | Problems encountered | Operation |
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| Check that the air mixture motor flap completes its travel without any hinderance | End of diagnosis | Flap obstructed or damaged | Remove the air mixture actuator flap impediment or replace the flap, if damaged. |