Isuzu 1999 RODEO Workshop Manual page 881

6E1–254 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0440 EVAP Control System Malfunction (Cont'd)
Step
10 1. Disconnect the fuel tank vapor line and the EVAP
purge line from the EVAP canister.
2. Block the canister fitting for the fuel tank vapor line.
3. Connect a hand vacuum pump to the canister fitting
for the EVAP purge line.
4. Ensure that the EVAP vent solenoid is still
commanded ON (closed).
5. Attempt to apply the specified vacuum to the EVAP
canister.
Can vacuum be maintained at the specified value?
11 1. Visually/physically
conditions:
f
Restricted fuel tank vapor line.
f
Restricted EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
12 1. Disconnect the throttle body to EVAP emission
canister purge vale vacuum hose from the EVAP
canister purge valve.
2. Connect a hand vacuum pump to the EVAP canister
purge vale vacuum source fitting.
3. Apply the specified amount of vacuum to the EVAP
canister purge valve.
4. Command the EVAP purge valve ON, using the
Tech 2.
Does the EVAP canister purge vale release the
vacuum?
13 1. Connect the in. Hg vacuum gauge on the EVAP
pressure/purge cart J41413 of the vacuum source
line.
2. Start the engine.
3. Stabilize the engine rpm near the specified value.
4. Momentarily depress the throttle open and then
immediately let the throttle return to idle.
Did the vacuum gauge read greater than the specified
value when the throttle was opened then closed?
14 1. Visually/physically
conditions:
f
Vent hose disconnected or damaged.
f
EVAP canister damaged.
2. If a problem is found, repair as necessary.
Was a repair necessary?
15 1. Visually/physically
conditions:
f
Missing or malfunctioning fuel cap.
f
Disconnected or leaking fuel tank vapor line.
f
Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a repair necessary?
Action
check for the following
check for the following
check for the following
Value(s) Yes
5 in. Hg (17
Go to Step
kPa)
15
Go to Step
— 20
10in. of Hg
Go to Step
(34 kPa)
13
Go to
2500 RPM 10
Diagnostic
Aids
in. Hg
Go to Step
—
20
Go to Step
— 20
No
Go to Step
14
Go to EVAP
Control
System
Diagnosis
Go to Step
17
Go to Step
18
Go to Step
19
Go to Step
16