EVAP Canister Purge Valve
- Check canister purge valve. Remove valve and disconnect hoses. Connect Vacuum Pump (999-5843) to tube marked "B". See Fig 1. Vacuum gauge should read vacuum while pumping (resistance should be felt) and quickly return to atmospheric pressure once pumping is stopped. Air is admitted into purge valve through tube marked "A". See Fig 1. If air is felt and heard through tube marked "A", go to next step. If not, go to step 4.
- Connect Vacuum Pump (999-5843) to tube marked "A" and pump until vacuum is achieved. Vacuum should remain constant. If vacuum remains constant, go to next step. If not, go to step 4.
- Connect canister purge valve electrical connector while vacuum pump is connected to tube marked "A". Vacuum should reduce. If vacuum does not reduce, go to next step. If vacuum reduces, canister purge valve is OK.
- Replace canister purge valve. See EVAP CANISTER PURGE VALVE
in REMOVAL & INSTALLATION - S40 & V40 article. Repeat procedure in step 1.
Courtesy of VOLVO CARS OF NORTH AMERICA.