Toyota 4-Runner 1985 Repair Manual page 107

EMISSION CONTROL SYSTEMS (EFI) - Fuel Evaporative Emission Control (EV AP) System EC-7
EC1116
EC1117
EC1118
INSPECTION OF CHARCOAL CANISTER
1. REMOVE CHARCOAL CANISTER
2. VISUALLY INSPECT CHARCOAL CANISTER CASE
Look for cracks or damage.
3. CHECK FOR CLOGGED FILTER AND STUCK CHECK
VALVE
(a) Using low pressure'compressed air, blow into the tank
pipe and check that the air flows without resistance
from the other pipes.
(b) Blow into the purge pipe and check that the air does
not flow from the other pipes.
If a problem is found, replace the charcoal canister.
4. CLEAN FILTER IN CANISTER
Clean the filter by blowing
3
kg/cm2
(43
psi,
294
kPa) of
compressed air into the tank pipe, while holding the purge
pipe closed.
NOTE:
• Do not attempt to wash the canister.
• No activated carbon should come out.
5. INSTALL CHARCOAL CANISTER