Isuzu Trooper 1999 Workshop Manual page 1143

6E–342
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step
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?
15 Replace the EVAP canister vent solenoid.
Is the action complete?
16 1. Ignition "ON," engine not running.
2. Using the Tech 2, command the EVAP canister vent
solenoid "ON" (closed).
3. Using the EVAP pressure/purge cart J 41413,
pressurize and monitor the EVAP system to 15 in.
H2O.
4. Switch the rotary switch on the cart to "HOLD" and
observe the EVAP pressure gauge.
Does the pressure decrease to less than the specified
value within 2 minutes?
DTC P0440 – EVAP System (Cont'd)
Action
check for the following
check for the following
Value(s) Yes
Refer to
Diagnostic
15 in. Hg Aids
— Go to Step 16
— Go to Step 16
— Go to Step 16
— Go to Step 16
Go to Step 16
—
— Go to Step 16
2.14 V Go to Step 4
No
Go to Step 14
Go to Step 15
Go to Step 12
—
—
—
—
Verify repair