Fuel Tank Pressure Control Valve (With Enhanced EVAP Control System)
- Remove tank pressure control valve (located next to EVAP canister). See Fig 1. Using a vacuum hose, blow forcefully into tank side (TANK) port of valve. Air should pass slowly through valve and out canister side (CAN) port of valve.
- Using vacuum hose, blow softly into canister side port of valve. Air should pass smoothly through valve and out tank side port. If fuel tank pressure valve operates as specified, go to next step. Replace fuel tank pressure control valve if it does not operate as specified.
- Apply vacuum to fuel tank pressure valve to vacuum port. With vacuum applied, blow into tank side port. Air should pass easily through valve and out canister side port. Replace fuel tank pressure control valve if it does not operate as specified.
NOTE:
On vehicles equipped with fuel Tank Pressure Control Solenoid Vacuum (TPC SV) 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.