Isuzu 2000 Trooper Workshop Manual page 1203

6E–334
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0442 – EVAP System Leak Detected (Cont'd)
Step
5 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 canister vent solenoid is still
commanded "ON" (closed).
5. Attempt to apply vacuum to the EVAP canister.
Can the vacuum be maintained at the specific value?
6 1. Visually/physically
conditions:
D
Vent hose disconnected or damaged.
D
EVAP canister damaged.
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 1. Visually/physically
conditions:
D
Missing or faulty fuel cap.
D
Disconnected or leaking fuel tank vapor line.
D
Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
9 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?
10 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?
Action
check for the following
check for the following
Value(s) Yes
Go to Step 8
1.46V
— Go to Step 10
— Go to Step 10
— Go to Step 10
— Go to Step 10
2.14V Go to Step 2
No
Go to Step 6
Go to Step 7
—
Go to Step 9
—
Verify repair