Code P0531 : A/C Refrigerant Pressure Sensor "A" Circuit Range/Performance

[Hystérique]

Quelqu'un a une idée? Mon A/C ne fonctionne plus...

[rj240]

Quel modelle/annee?

[Hystérique]

S60 2002 2.4

[rj240]

Code generique P0531 peut etre un de deux codes de Volvo: ECM-500A A/C pressure sensor Faulty signal, ou ECM-500A A/C pressure sensor No Signal...

[rj240]

ECM-500A Air conditioning (A/C) pressure sensor. Faulty signal

Diagnostic trouble code (DTC) information

A2300539 Condition
The control module checks the compressor clutch thermal switch, although only once per operating cycle or 15 minutes after the last compressor activation.
The control module also checks that the pressure rises 61 kPa within 12 seconds at the first compression stroke otherwise the control module interprets it as a faulty signal.
In addition the A/C pressure sensor checks that the outside temperature is above 15 °C, the speed above 50 km/h and the pressure lower than 97 kPa for more than 4 minutes. If these conditions are satisfied the control module interprets it as a fault, no signal, and diagnostic trouble code (DTC) ECM-500A is stored.

Substitute value
Air conditioning (A/C) shut off
A/C pressure of 700 kPa assumed

Possible source

Faulty signal:
defective air conditioning (A/C) compressor
low pressure in the air conditioning (A/C) system

No signal:
low pressure in the air conditioning (A/C) system
defective air conditioning (A/C) pressure sensor

[rj240]

ECM-500A Air conditioning (A/C) pressure sensor. No signal, B5244S

Diagnostic trouble code (DTC) information

A2300539 Condition
The control module checks the compressor clutch thermal switch, although only once per operating cycle or 15 minutes after the last compressor activation.
The control module also checks that the pressure rises 61 kPa within 12 seconds at the first compression stroke otherwise the control module interprets it as a faulty signal.
In addition the A/C pressure sensor checks that the outside temperature is above 15 °C, the speed above 50 km/h and the pressure lower than 97 kPa for more than 4 minutes. If these conditions are satisfied the control module interprets it as a fault, no signal, and diagnostic trouble code (DTC) ECM-500A is stored.

Substitute value
Air conditioning (A/C) shut off
A/C pressure of 700 kPa assumed

Possible source

Faulty signal:
defective air conditioning (A/C) compressor
low pressure in the air conditioning (A/C) system

No signal:
low pressure in the air conditioning (A/C) system
defective air conditioning (A/C) pressure sensor

Fault symptom[s]
Air conditioning (A/C) compressor not operating

[Hystérique]

defective air conditioning (A/C) pressure sensor

Un manque de réfrigérant (donc à remplir) donne-t-il ce code?

Peux-tu me confirmer si le capteur se change facilement sans outil particulier en quelques minutes? Si le A/C est fermé, est-ce que le système est encore sous pression depuis la dernière fois que c'était opérationnelle (1 semaine environ)?

[rj240]

Avant de changer le capteur, il faut vider la systeme...

Oui un manque de refrigerant peut donner ce code, commence avec ca...

[Hystérique]

Après au moins 5 étés d'utilisation, je vais faire faire une vérification complète par un spécialiste en air climatisé, mais seulement en avril 2016 étant donné que c'est pas une mince affaire et que mon budget auto 2015 est presque atteint. Ma priorité devient maintenant la recherche des pneus d'hiver d'ici les 2 prochains mois! Je remonterai le sujet en temps et lieu.

Merci rj240!