Disconnect the electrical connection for the linear sensor

    See K120 LINEAR SENSOR FOR FANS

Check that Pin 1 is earthed and Pin 2 is at +5V.

Connect a linear potentiometer (with and end of scale of 1 KOhm, previously positioned at around 500 Om between the centre pin and one of the side pins) to the pins of the linear sensor electrical connector.

Turn the ignition key to the ON position.

Using a multimeter, check that the voltage between pins 1 and 3 is around 2.5V.

Switch on the engine and turn the air conditioning on using the dedicated switch located in the climate control system control unit.

The climate control system should work normally in these conditions.

Alter the potentiometer resistance until the voltage reading on the multimeter between pins 1 and 3 is about 0 V.

In these circumstances, the air conditioning system should switch off because the engine management node receives information that the pressure in the circuit is low.

Alter the potentiometer resistance until the voltage reading on the multimeter between pins 1 and 3 is about 4.6 V.

In these circumstances, the air conditioning system should switch off because the engine management node receives information that the pressure in the circuit is high.