Isuzu 1999 RODEO Workshop Manual page 1569

6E2–326
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Step
8 1. Disconnect the vacuum source line at the EVAP
canister purge solenoid and plug the vacuum
source fitting on the solenoid.
2. Using the Tech 2 output tests function, select
"System Perf." and activate.
3. Pressurize the EVAP system to the specified value
5 in. H2O (monitor pressure using gauge on cart).
4. Observe the EVAP pressure gauge on the EVAP
pressure/purge cart J 41413 while removing the
plug from the EVAP canister purge solenoid.
Does "Fuel Tank Pressure" decrease to the specified
value within 15 seconds while "System Perf." is
activated?
9 1. Connect the in. Hg vacuum gauge on the EVAP
pressure/purge cart J 41413 to the vacuum source
line.
2. Ignition "ON," engine idling.
3. Run the engine above 2000 RPM and and observe
source vacuum level (monitor vacuum using gauge
on cart).
Does source vacuum level exceed the specified value?
10 1. Visually/physically
conditions:
f
Vent hose disconnected or the damaged.
f
EVAP canister damaged.
2. If a problem is found, repair as necessary.
Was a problem found?
11 1. Visually/physically
conditions:
f
Missing or faulty 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 problem found?
12 1. Using Tech 2, command the EVAP canister vent
solenoid "ON" (closed).
2. With the cart connected to the EVAP service port,
continuously attempt to pressurize the EVAP
system by leaving the cart control knob in the
pressurize position.
3. Using ultrasonic leak detector J 41416, locate and
repair leak in EVAP system. (It may be necessary to
partially lower the fuel tank to examine the
connections on top of the tank.)
Is the action complete?
13 Replace the EVAP canister purge solenoid.
Is the action complete?
14 Locate and repair cause of no source vacuum to the
EVAP canister purge solenoid.
Is the action complete?
DTC P0440 – EVAP System (Cont'd)
Action
check for the following
check for the following
Value(s) Yes
Go to Step 9
0 in. H2O
Refer to
Diagnostic
Aids
15 in. Hg
— Go to Step 16
Go to Step 16
—
— Go to Step 16
— Go to Step 16
— Go to Step 16
No
Go to Step 13
Go to Step 14
Go to Step 15
Go to Step 12
—
—
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