Nissan Skyline R32 recirculation valve function inspection
• Remove hose on upper flow side of recirculation valve compressor (cover end of hose with cap) and check if air blows back when throttle is closed quickly.
Nissan Skyline R32 recirculation valve unit inspection
• Use a hand vacuum pump to create negative pressure [-20.0±4.0 kPa (-150±30 mmHg, -5.91 ±1.18 inHg)]. The recirculation valve diaphragm must start to lift and the vacuum pressure must be maintained.