volvo Workshop Repair Guides

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5: Piston with slits
6: Return spring
A: Channel leading to chamber A1 in the CVVT unit
B: Channel leading to chamber B1 in the CVVT unit
C: Channel for oil (pressure)
D: Channel for oil (return)
The camshaft reset valve controls the oil flow to the continuous variable valve timing (CVVT) unit. The engine control module (ECM) uses a pulse
width modulation (PWM) signal to control the valve. See also:  Design See: Powertrain Management/Computers and Control Systems/Description and
Operation/Engine Control Module (ECM)/Design 

Control takes place as follows when deploying the camshaft 

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Adaptive Functions > Page 1779

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