Isuzu Trooper (2000 year). Service manual — part 300
6E–329
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0440 EVAP System
D06RY00128
Circuit Description
The evaporative system includes the following
components:
D
Fuel tank
D
EVAP canister duty solenoid valve
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 cut valve (purge solenoid)
The evaporative leak detection diagnostic strategy is
based on applying vacuum to the EVAP system and
monitoring vacuum decay. The powertrain control
module (PCM) monitors vacuum level via the fuel tank
pressure sensor input. At an appropriate time, the EVAP
canister purge solenoid and the EVAP canister vent
solenoid are turned “ON,” allowing engine vacuum to
draw a small vacuum on the entire evaporative emissions
system. If a sufficient vacuum level cannot be achieved, a
large leak or a faulty EVAP canister purge solenoid is
indicated. This can be caused by the following conditions:
D
Disconnected or faulty fuel tank pressure sensor
D
Missing or faulty fuel cap
D
Disconnected, damaged, pinched, or blocked EVAP
purge line
D
Disconnected or damaged EVAP vent hose
D
Disconnected, damaged, pinched, or blocked fuel tank
vapor line
D
Disconnected or faulty EVAP canister cut valve
D
Disconnected or faulty EVAP canister duty solenoid
valve
D
Open ignition feed circuit to the EVAP canister vent
solenoid or the EVAP canister cut valve
D
Damaged EVAP canister
D
Leaking fuel sender assembly O-ring
D
Leaking fuel tank or fuel filler neck
Any of the above conditions can set DTC P0440.
Conditions for Setting the DTC
D
No TP 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
Start-up intake air temperature is greater than 4
°
C
(39
°
F) .
D
Start-up intake air temperature is not more than 2
°
C
(4
°
F) greater than start-up engine coolant
temperature.
D
Vehicle speed is less than 5 mph (8 km/h).
D
Throttle position is greater than 3%.
D
Minimal fuel slosh.
D
BARO is greater than 70 kPa.
6E–330
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
D
The EVAP system is unable to achieve or maintain
vacuum during the diagnostic test.
D
Above conditions are present for 60 to 180 seconds.
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 in the Failure
Records data.
Conditions for Clearing the MIL/DTC
D
The PCM will turn the MIL “OFF” when the diagnostic
has been run and the fault condition is no longer
present.
D
A history DTC P0440 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
D
DTC P0440 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
Cracked or punctured EVAP canister.
D
Damaged or disconnected source vacuum line, EVAP
purge line, vent hose or fuel tank vapor line.
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 vacuum source, EVAP
purge, or fuel tank vapor line–Verify that the lines are
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 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 P0440.
3. Checks the fuel tank pressure sensor at ambient
pressure.
4. Determines whether or not the EVAP system can be
sealed sufficiently to be pressurized. If not, the
large leak must be located and corrected before
continuing with diagnosis.
5. Verifies that the fuel tank pressure sensor accurately
reacts to EVAP system pressure changes.
8. Checks for a blocked EVAP canister purge solenoid.
The PCM commands the EVAP canister purge
solenoid “OFF” (open) and the vent solenoid “ON”
(closed) with the Tech 2 “System Perf.” EVAP
output control function activated. Any pressure in
the system should be released through the EVAP
canister purge solenoid within a few seconds when
“System Perf.” is activated.
9. Ensures that sufficient source vacuum is present at
the EVAP canister purge solenoid.
DTC P0440 – EVAP System
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
Is DTC P0452 or P0453 also set?
—
Go to
other
DTC first
Go to
Step 3
3
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?
1.51 V
Go to
Step 4
Go to
DTC
P0452 or
DTC P0453
4
1. Replace the fuel cap.
2. Engine is running.
3. Observe “Fuel Tank Vacuum” on the Tech 2.
Does Tech 2 indicate “Fuel Tank Vacuum” at the
specified value?
1.47–1.51 V
Go to
Step 7
Go to
Step 6
6E–331
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0440 – EVAP System
(Cont'd)
Step
No
Yes
Value(s)
Action
5
1. Ignition “OFF”.
2. Disconnect the fuel tank vapor line and the EVAP
purge line from the EVAP canister.
3. Block the canister fitting for the fuel tank vapor line.
4. Connect a hand vacuum pump to the canister fitting
for the EVAP purge line.
5. Ensure that the EVAP canister vent solenoid is still
commanded “ON” (closed).
6. Attempt to apply vacuum to the EVAP canister.
Observe “Fuel tank pressure” on the Tech 2.
Does the Tech 2 indicate “Fuel tank pressure” at the
specified value?
1.47–1.51 V
Go to
Step 8
Go to
Step 7
6
1. Visually/physically check for the following
conditions:
D
Restricted fuel tank vapor line.
D
Restricted EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
DTC
P0452 or
DTC P0453
7
1. Visually/physically check for the following
conditions:
D
Vent hose disconnected or the damaged.
D
EVAP canister damaged.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 11
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?
—
Verify repair
Go to
Step 9
9
Replace the EVAP canister purge solenoid.
Is the action complete?
—
Verify repair
—
10
Locate and repair cause of no source vacuum to the
EVAP canister purge solenoid.
Is the action complete?
—
Verify repair
—
11
Replace the EVAP canister vent solenoid.
Is the action complete?
—
Verify repair
—
6E–332
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0442 EVAP System Small Leak Detected
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
The evaporative leak detection diagnostic strategy is
based on applying vacuum to the EVAP system and
monitoring vacuum decay. The powertrain control
module (PCM) monitors vacuum level via the fuel tank
pressure sensor input. At an appropriate time, the EVAP
canister purge solenoid and the EVAP canister vent
solenoid are turned “ON,” allowing engine vacuum to
draw a small vacuum on the entire evaporative emissions
system. After the desired vacuum level has been
achieved, the EVAP canister purge solenoid is turned
“OFF,” sealing the system. A leak is detected by
monitoring for a decrease in vacuum level over a given
time period, all other variables remaining constant. A
small leak in the system will cause DTC P0442 to be set.
Conditions for Setting the DTC
D
No TP sensor, ECT sensor, Tank pressure sensor, IAT
sensor, or MAP sensor DTCs set.
D
The DTC P0440 diagnostic test has passed.
D
A vacuum decay condition, indicating a small leak, is
detected during the diagnostic test.
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) during the second key cycle in which the DTC
sets.
D
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
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 P0442 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
D
DTC P0442 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
Cracked or punctured EVAP canister.
D
Damaged source vacuum line, EVAP purge line, EVAP
vent hose or fuel tank vapor line.
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