Charcoal Canister
- Disconnect the hose leading from the TPCV to the lower port of the charcoal canister at the canister end. Attach a hose to the fuel tank port of the TPCV and attempt to blow through it. Little or no air should pass through the TPCV.
- With a hand vacuum pump, apply vacuum (15" Hg. or 51 kPa) through the TPCV upper tube (manifold vacuum supply port). If the diaphragm does not hold vacuum for at least 20 seconds, the diaphragm is leaking, and the TPCV must be replaced.
- If the diaphragm holds vacuum, try to blow through the hose connected to the lower tube while vacuum is still being applied. An increased flow of air should be observed. If not, replace the TPCV.
- Attach a hose to the lower port of the canister and attempt to blow through it. Air should pass into the canister. If not, replace the canister.
- Disconnect the canister purge solenoid electrical connector, attach a hose to the upper port of the canister, and attempt to blow through it. Air should not pass into the canister. If air passes, replace the purge solenoid.
- Measure the resistance of the purge solenoid. Resistance should be greater than 20 ohms and less than 100 ohms. If the solenoid resistance is not in this range, replace the solenoid.
- Reconnect all purge hoses and the solenoid electrical connector.