If suddenly closing the throttle body during driving, the boost pressure within the pipes increase. This increased pressure does not flow into the intake but transfers in the opposite direction and creates a Tipout Surge1), caused by sudden increase in pressure at the impeller within the compressor. This may result in making collision sound. This device helps reduce the collision sound by discharging the highly increased pressure before the compressor rather than after the compressor. Usually positive pressure is connected to the actuator. The RCV is closed at this time. When decelerating after acceleration, the solenoid valve will operate. This act will create a vacuum state connecting the negative pressure to the actuator, which lets it overcome the spring force and pull the diaphragm. At this state, the air entering the combustor does not affect the compressor wheel and exerts action within the air cleaner.
ECM sets DTC P2261 if the ECM detects that bypass valve is abnormal open or close stuck.
Item
Detecting Condition
Possible Cause
DTC Strategy
Plausibility check
RCV stuck
Enable
Conditions
Case1
time after valve close request > 500ms
Failure not detected for following DTCs
Stuck open
Case2
pedal value gradient < -97.7%/s
maximum pressure up throttle deviation < 100hPa
Stuck close
Threshold Value
pressure up throttle mean value > modeled pressure up throttle with closed
pressure up thottle mean value < modeled pressure up throttle with opened valve + 50hPa
6.5hPa*s > modeled pressure up throttle value > 6.5hPa*s
Diagnostic Time
immediately
MIL On Condition
2 Driving cycles
Temp.(?)
Resistance(?)
20
82
28.3 ~ 31.1