Component Tests and General Diagnostics

EVAP CANISTER
Check EVAP canister as follows:
1. Blow air in port (A) and check that there is no leakage.
2. Apply vacuum to port (A). [Approximately - 13.3 to - 20.0 kPa ( - 100 to - 150 mmHg, - 3.94 to - 5.91 in Hg)]
3. Cover port (D) by hand.
4. Blow air in port (C) and check that it flows freely out of port (B).




FUEL CHECK VALVE (With rollover valve)
Check valve operation
1. Blow air through connector on fuel tank side.
A considerable resistance should be felt and a portion of air flow should be directed toward the canister side.
2. Blow air through connector on canister side.
Air flow should be smoothly directed toward fuel tank side.
3. If fuel check valve is suspected of not properly functioning in steps 1 and 2 above, replace it.

Rollover valve operation
Ensure that continuity of air passage does not exist when the installed rollover valve is tilted to 90° or 180°.




FUEL TANK VACUUM RELIEF VALVE
1. Wipe clean valve housing.
2. Suck air through the cap. A slight resistance accompanied by valve clicks indicates that valve A is in good mechanical condition. Note also that, by further sucking air, the resistance should disappear with valve clicks.
3. Blow air on fuel tank side and ensure that continuity of air passage exists through valve B.
4. If valve is clogged or if no resistance is felt, replace cap as an assembly.

CAUTION: Use only a genuine fuel filler cap as a replacement.