DTC 315 - Canister Purge (Cp) System
WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
Start and run engine at idle. Remove hose between CP valve and EVAP canister. Start and run engine at idle. Ensure there is no vacuum in EVAP valve when valve is not activated, Using scan tool, go to scrolling values list. Check CP valve value to determine whether valve is activated. If there is vacuum, retest using new CP valve. If there is no vacuum, check CP valve for dirt. Attempt to activate CP valve. Ensure valve is not sticking when it is operated. Repair as necessary. If no faults can be found, test system using new CP valve.