Isuzu 2000 Trooper Workshop Manual page 1206

DTC P0446– EVAP Canister Vent Blocked (Cont'd)
Step
5 1. Disconnect the large vent hose (marked "AIR") from
the EVAP canister.
2. Switch the rotary switch on the cart J 41413 to
"PURGE."
3. Ignition "ON," engine idling at normal operating
temperature.
4. Observe vacuum gauge for 5 seconds while holding
the engine speed at 2500 RPM.
Does the vacuum remain less than the specified value?
6 1. Inspect the vent hose between the EVAP canister
and the EVAP canister vent solenoid for kinks,
pinched areas, or any other form of blockage.
2. If a problem is found, repair as necessary.
Was a problem found?
7 Replace the EVAP canister vent solenoid.
Is the action complete?
8 Replace the EVAP canister.
Is the action complete?
9 1. Using Tech 2, command the EVAP canister vent
solenoid "ON" (closed).
2. Using the EVAP pressure/purge cart J 41413,
pressurize and monitor the EVAP system to 15 in.
H2O.
3. Switch the rotary switch on cart J 41413 to "HOLD."
4. Using the Tech 2, command the EVAP canister vent
solenoid "OFF" (open) while observing the EVAP
pressure gauge on cart J 41413.
Does the EVAP pressure return to the specified value
within 5 seconds?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action Value(s) Yes
Go to Step 6
30 in. H2O
— Go to Step 9
— Go to Step 9
— Go to Step 9
0 in. H 2 O Verify repair
6E–337
No
Go to Step 8
Go to Step 7
—
—
Go to Step 2