Isuzu Trooper (2000 year). Service manual — part 301
6E–333
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
D
Poor connection at PCM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
D
Damaged harness–Inspect the wiring harness to the
EVAP canister vent solenoid, EVAP canister purge
solenoid and the fuel tank pressure sensor for an
intermittent open or short circuit.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If an EVAP canister vent solenoid or an EVAP
canister purge solenoid electrical fault is present,
the purge system will not operate correctly.
Repairing the electrical fault will very likely correct
the condition that set DTC P0442.
3. Checks the fuel tank pressure sensor at ambient
pressure.
4. Verifies that the fuel tank pressure sensor accurately
reacts to EVAP system pressure changes.
DTC P0442 – EVAP System Leak Detected
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Ignition “OFF.”
2. Remove the fuel cap.
3. Ignition “ON.”
4. Observe “Fuel Tank Pressure” on the Tech 2.
Does the Tech 2 indicate “Fuel Tank Pressure” at the
specified value?
1.51V
Go to
Step 3
Go to
Fuel
Tank
Pressure
System
3
IMPORTANT: Before continuing with diagnosis, zero
the EVAP pressure and vacuum gauges on EVAP
pressure/purge cart J 41413 (refer to tool operating
instructions).
1. Replace the fuel cap.
2. Capture Failure Records data for DTC P0442 and
clear DTCs.
3. Connect the EVAP pressure/purge cart J 41413 to
the EVAP service port.
4. Using the Tech 2, command the EVAP canister vent
solenoid “ON” (closed).
5. Using the EVAP pressure/purge cart J 41413,
pressurize the EVAP system to the specified value.
6. Observe “Fuel Tank Pressure” on the Tech 2.
Does the Tech 2 indicate “Fuel Tank Pressure” at the
specified value?
1.47V
Go to
Step 4
Go to
Fuel
Tank
Pressure
System
4
1. Ignition “ON,” engine idling.
2. Using the Tech 2, command the EVAP canister vent
solenoid “ON” (closed).
3. Using the EVAP pressure/purge cart J 41413,
pressurize 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?
1.47 – 1.51V
Go to
Step 5
Refer to
Diagnostic
Aids
6E–334
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0442 – EVAP System Leak Detected
(Cont'd)
Step
No
Yes
Value(s)
Action
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?
1.46V
Go to
Step 8
Go to
Step 6
6
1. Visually/physically check for the following
conditions:
D
Vent hose disconnected or damaged.
D
EVAP canister damaged.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 10
Go to
Step 7
7
Replace the EVAP canister vent solenoid.
Is the action complete?
—
Go to
Step 10
—
8
1. Visually/physically check for the following
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?
—
Go to
Step 10
Go to
Step 9
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?
—
Go to
Step 10
—
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?
2.14V
Go to
Step 2
Verify repair
6E–335
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0446 EVAP Canister Vent Blocked
D06RY00128
Circuit Description
The evaporative system includes the following
components:
D
Fuel tank
D
EVAP canister vent solenoid
D
Fuel tank pressure sensor
D
Fuel pipes and hoses
D
Vapor lines
D
Fuel cap
D
Evaporative emissions canister
D
Purge lines
D
EVAP canister purge solenoid
An incorrect fuel tank pressure sensor signal is detected
by monitoring fuel tank pressure when the key is first
turned “ON” during a cold start. If the fuel tank pressure
signal is out of range, DTC P0446 will set. A restricted or
blocked EVAP vent path is detected by monitoring fuel
tank pressure during normal operation (EVAP canister
vent solenoid open, EVAP canister purge solenoid
normal). With the EVAP canister vent solenoid open,
vacuum level in the system should be very low unless the
vent path is blocked. A blockage can be caused by the
following condition:
D
Faulty EVAP canister vent solenoid (stuck closed).
D
Plugged, kinked or pinched vent hose.
D
Shorted EVAP canister vent solenoid driver circuit.
D
Plugged evaporative canister.
If any of these conditions are present, DTC P0446 will set.
Conditions for Setting the DTC
D
No TP sensor, ECT sensor, Tank pressure sensor, IAT
sensor, or MAP sensor DTCs set.
D
Start-up engine coolant temperature is less than 32
°
C
(90
°
F).
D
Start-up engine coolant temperature is not more than
7
°
C (13
°
F) greater than start-up intake air
temperature.
D
Vehicle speed is less than 75 mph (120 km/h).
D
Throttle position is greater than 7% but less than 30%.
D
Minimal fuel slosh.
D
Fuel tank level is between 10% and 90%.
D
BARO is greater than 70 kPa.
Action Taken When the DTC Sets
D
The PCM will illuminate the MIL during the second key
cycle in which the DTC sets.
D
The PCM will store conditions which were present
when the DTC set as Freeze Frame and Failure
Records data.
Conditions for Clearing the MIL/DTC
D
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P0446 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
6E–336
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
D
DTC P0446 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
D
Poor connection at PCM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
D
Damaged harness–Inspect the wiring harness to the
EVAP canister vent solenoid, EVAP canister purge
solenoid and the fuel tank pressure sensor for an
intermittent open or short circuit.
D
Kinked, pinched, or plugged vent hose–Verify that the
vent hose between the EVAP canister and EVAP
canister vent solenoid is not restricted.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If a vent solenoid electrical fault is present, the purge
system will not operate correctly. Repairing the
electrical fault will very likely correct the condition
that set DTC P0446.
3. Checks the fuel tank pressure sensor at ambient
pressure.
4. Verifies that the fuel tank pressure sensor accurately
reacts to EVAP system pressure changes.
6. Checks for a blocked EVAP canister.
DTC P0446– EVAP Canister Vent Blocked
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Ignition “ON.”
2. Capture Failure Records data for DTC P0446 and
clear DTCs.
3. Ignition “OFF.”
4. Remove the fuel cap.
5. Ignition “ON.”
6. Observe “Fuel Tank Pressure” on the Tech 2.
Does Tech 2 indicate “Fuel Tank Pressure” at the
specified value?
1.51V
Go to
Step 3
Go to
Fuel
Tank
Pressure
System
3
IMPORTANT: Before continuing with diagnosis, zero
the EVAP pressure and vacuum gauges on the EVAP
pressure/purge cart J 41413 (refer to tool operating
instructions).
1. Replace the fuel cap.
2. Using the Tech 2, command the EVAP vent solenoid
“ON” (closed).
3. Connect the EVAP pressure/purge cart J 41413 to
the EVAP service port.
4. Using the EVAP pressure/purge cart J 41413,
pressurize the EVAP system to the specified value.
5. Observe “Fuel Tank Pressure” on the Tech 2.
Does Tech 2 indicate “Fuel Tank Pressure” at the
specified value?
1.52 – 1.69V
Go to
Step 4
Go to
Fuel
Tank
Pressure
System
4
1. Maintain the EVAP pressure at 5 in. at H2O.
2. Using Tech 2, command the EVAP vent solenoid
“OFF” (open) while observing the EVAP pressure
gauge on the cart J 41413.
Does the EVAP pressure return to the specified value
within 5 seconds?
0 in. H2O
Refer to
Diagnostic
Aids
Go to
Step 5
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