Fuel Tank Pressure Control Valve
- Remove fuel tank pressure control valve. See Figure. Connect a hose to port marked TANK on fuel tank pressure control valve. Blow forcefully into hose. Air should pass through valve and exit from port marked CAN on fuel tank pressure control valve.
- Remove hose from TANK port. Connect hose to port marked CAN on fuel tank pressure control valve. Blow softly into hose. Air should pass through valve and exit from port marked TANK on fuel tank pressure control valve.
- Apply vacuum to fuel tank pressure control valve vacuum port. With vacuum applied, blow into port marked TANK. Air should pass through valve and exit from port marked CAN on fuel tank pressure control valve. Replace fuel tank pressure control valve if operation is not as specified.
NOTE:
On models equipped with EVAP fuel tank pressure control solenoid vacuum valve, operation of EVAP canister purge system is conditional. EVAP canister purge system only operates when engine is sufficiently warmed up and Heated Oxygen Sensor (HO2S) is fully activated. Also, when purge hose is disconnected when checking for vacuum, fresh air will be drawn into purge line. PCM will detect a change in purge gas concentration and may stop purge operation. If this occurs, it is considered normal. If no vacuum is felt during following test, it may be necessary to repeat test to avoid replacement of good components.