Drain System Test - Subaru Forester Technicians Reference Booklet

2
000 Model Year Evaporative System Diagnosis
2000 Legacy Drain Line 2000 Legacy Drain Line 2000 Legacy Drain Line 2000 Legacy Drain Line 2000 Legacy Drain Line
Purge
Drain
Shut off Valve
Pressure Control Valve
Fuel Tank and
Vent Control Valve
Canister

Drain System Test

Drain System Test

Drain System Test Drain System Test Drain System Test
Steps 1 through 4 are testing the air tightness of the
adapter.
(1) Disconnect D-1 from canister. Picture 115.
(2) Connect PT-1 with ST adapter-1.
(3) Block ST adapter-1 with ST Plug and
pressurize.
Effective 09-25-03
Drain Valve
115
(4) Does pressure hold?
YES go to step (5).
NO, replace Adapter-1 and go to step (1).
(5) Remove ST-plug from ST-adapter-1.
Step 6 and 7 will test the drain hoses,
canister, drain valve and filter for restrictions
and blockages.
(6) Connect ST-adapter-1 with D-1 hose.
(7) Pressurize.
(8) Did pressure buildup?
NO go to step (9).
YES go to step (9F).
Step 9 and 10 will test the air tightness of the vent
hoses from the canister to the drain valve and the
mechanical and electrical operation of the drain
valve.
(9) Activate vent valve solenoid with select
monitor.
(10) Pressurize.
(11) Does pressure hold for the time the
solenoid is on and then drop to zero?
YES go to step (12).
NO go to step (12F).
(12) Turn off vent valve solenoid with select
monitor.
(13) Remove ST adapter-1 from D-1.
(14) Connect D-1 to canister.
Notes:
16
STOP STOP STOP
STOP STOP