Isuzu 1999 RODEO Workshop Manual page 893

6E1–266 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0446 EVAP Control System Vent Control Circuit Malfunction (Cont'd)
Step
9 1. Disconnect the large vent hose (marked air) from
the EVAP canister.
2. Switch the rotary switch on the cart J41413 to
PURGE.
3. Start the engine and allow the engine to reach
operating temperature.
4. Observe the vacuum gauge for 5 seconds while
holding the engine speed at the specified value.
Does the vacuum remain below the specified value?
10 1. Inspect the EVAP vent hose between the EVAP
canister and the EVAP vent solenoid for being
kinked, pinched, or other wise blocked.
2. If a problem is found, repair as necessary.
Was a problem found?
11 Replace the EVAP vent solenoid. Refer to Diagnostic
Aids
Is the action complete?
12 Replace the EVAP canister. Refer to EVAP Canister
Replacement.
Is the action complete?
13 1. Using the Tech 2, command the EVAP vent solenoid
ON (closed).
2. Pressurize the EVAP system to the specified value.
3. Switch the rotary switch on the cart J41413 to
HOLD.
4. Using the Tech 2, command the EVAP vent solenoid
OFF (open) while observing the EVAP pressure
gauge on the cart J41413.
Does the EVAP pressure return to the specified value
within 5 seconds?
Action Value(s) Yes
30 in. H2O
Go to Step
2500 RPM 10
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13
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13
1.51V System OK
No
Go to Step
12
Go to Step
11
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Go to Step 3