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Home >> Volvo >> 2008 >> XC70 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control Module (ECM) - Specifications, Other >> Engine Control Module (ECM) (B6304T2/T4 2009-2012) >> Description Of Activations >> Component/Function >> Relief Valve (Off/On)

Relief Valve (Off/On)

The valve opens using the start button and closes using the stop button.

A weak sound can be heard from the valve.