Hi this Nissan is a 2013 model with zapi ac0 and ac2 control units. The truck all works fine but has this information onnthe dash
"Check PS correction valve 502". As I do not have any information was wondering if someone could advise what needs to be done to clear this error. Not sure what a correction valve is. If anyone has a wiring diagram perhaps that could help.

Thanks in advance.

Regards