fuel cap ISUZU AXIOM 2002 Service Owner's Guide
[x] Cancel search | Manufacturer: ISUZU, Model Year: 2002, Model line: AXIOM, Model: ISUZU AXIOM 2002Pages: 2100, PDF Size: 19.35 MB
Page 1286 of 2100
6E±319
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Engine speed is less than 1200 RPM.
Above conditions are present for 60 to 180 seconds.
Action Taken When the DTC Sets
The PCM will ON the MIL after second trip with
detected the fault.
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
The PCM will turn the MIL ªOFFº when the diagnostic
has been run and the fault condition is no longer
present.
A history DTC P0440 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0440 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
Cracked or punctured EVAP canister.
Damaged or disconnected source vacuum line, EVAP
purge line, vent hose or fuel tank vapor line.
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.
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.
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 ªOFFº (open) and the vent solenoid ªONº
(closed) with the Tech 2 ªSystem Perfº, EVAP
output control function activated. Any pressure in
the system should be released through the EVAP
canister purge solenoid within a few seconds when
ªSystem Perfº, is activated.
9. Ensures that sufficient source vacuum is present at
the EVAP canister purge solenoid.
DTC P0440 ± EVAP System
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Is DTC P0452 or P0453 also set?
Ð
Go to other
DTC first
Go to Step 3
31. Ignition ªOFFº.
2. Remove the fuel cap.
3. Ignition ªONº.
4. Observe ªFuel Tank Pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
1.51 VGo to Step 4
Go to DTC
P0452
or
DTC P0453
41. Replace the fuel cap.
2. Engine is running.
3. Observe ªFuel Tank Vacuumº on the Tech 2.
Does Tech 2 indicate ªFuel Tank Vacuumº at the
specified value?
1.47±1.51 VGo to Step 7Go to Step 6
Page 1287 of 2100
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6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0440 ± EVAP System
StepNo Ye s Value(s) Action
5Ignition ªOFFº.
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 ªONº (closed).
5. Attempt to apply vacuum to the EVAP canister.
Observe ªFuel tank pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel tank pressureº at the
specified value?
1.47±1.51 VGo to Step 8Go to Step 7
61. Visually/physically check for the following
conditions:
Restricted fuel tank vapor line.
Restricted EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repair
Go to DTC
P0452
or
DTC P0453
71. Visually/physically check for the following
conditions:
Vent hose disconnected or the damaged.
EVAP canister damaged.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 11
81. Visually/physically check for the following
conditions:
Missing or faulty fuel cap.
Disconnected or leaking fuel tank vapor line.
Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 9
9Replace the EVAP canister purge solenoid.
Is the action complete?
ÐVerify repairÐ
10Locate and repair cause of no source vacuum to the
EVAP canister purge solenoid.
Is the action complete?
ÐVerify repairÐ
11Replace the EVAP canister vent solenoid.
Is the action complete?
ÐVerify repairÐ
Page 1288 of 2100
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6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0442 EVAP System Small Leak Detected
060RY00398
Circuit Description
The evaporative system includes the following
components:
Fuel tank
EVAP canister vent solenoid
Fuel tank (vapor) pressure sensor
Fuel pipes and hoses
Vapor lines
Fuel cap
Evaporative emissions canister
Purge lines
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 ªONº, 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
ªOFFº, 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
No TP sensor, ECT sensor, Tank pressure sensor, IAT
sensor, or MAP sensor DTCs set.
BARO is more than 70 kPa.
Engine speed is less than 1200 RPM.
Fuel level is between 15% and 85%.
Vehicle speed is less than 5 mph (8 km/h).
The DTC P0440 diagnostic test has passed.
A vacuum decay condition, indicating a small leak, is
detected during the diagnostic test.
Action Taken When the DTC Sets
The PCM will ON the MIL after second trip with
detected fault.
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
The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
A history DTC P0442 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0442 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Page 1289 of 2100
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6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Aids
Check for the following conditions:
Cracked or punctured EVAP canister.
Damaged source vacuum line, EVAP purge line, EVAP
vent hose or fuel tank vapor line.
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.
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 oftenthe 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
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªOFFº.
2. Remove the fuel cap.
3. Ignition ªONº.
4. Observe ªFuel Tank Pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
1.51VGo to Step 3
Go to Fuel
Tank
Pressure
System
3IMPORTANT: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 ªONº (closed).
5. Using the EVAP pressure/purge cart J 41413,
pressurize the EVAP system to the specified value.
6. Observe ªFuel Tank Pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
1.47VGo to Step 4
Go to Fuel
Tank
Pressure
System
41. Ignition ªONº, engine idling.
2. Using the Tech 2, command the EVAP canister vent
solenoid ªONº (closed).
3. Using the EVAP pressure/purge cart J 41413,
pressurize the EVAP system to 15 in. H
2O.
4. Switch the rotary switch on the cart to ªHOLDº and
observe the EVAP pressure gauge.
Does the pressure decrease to less than the specified
value within 2 minutes?
1.47 ± 1.51VGo to Step 5
Refer to
Diagnostic
Aids
Page 1290 of 2100
6E±323
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0442 ± EVAP System Leak Detected
StepNo Ye s Value(s) Action
51. 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 ªONº (closed).
5. Attempt to apply vacuum to the EVAP canister.
Can the vacuum be maintained at the specific value?
1.46VGo to Step 8Go to Step 6
61. Visually/physically check for the following
conditions:
Vent hose disconnected or damaged.
EVAP canister damaged.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐGo to Step 10Go to Step 7
7Replace the EVAP canister vent solenoid.
Is the action complete?
ÐGo to Step 10Ð
81. Visually/physically check for the following
conditions:
Missing or faulty fuel cap.
Disconnected or leaking fuel tank vapor line.
Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐGo to Step 10Go to Step 9
91. Using Tech 2, command the EVAP canister vent
solenoid ªONº (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?
ÐGo to Step 10Ð
101. Ignition ªONº, engine not running.
2. Using the Tech 2, command the EVAP canister vent
solenoid ªONº (closed).
3. Using the EVAP pressure/purge cart J 41413,
pressurize and monitor the EVAP system to 15 in.
H
2O.
4. Switch the rotary switch on the cart to ªHOLDº and
observe the EVAP pressure gauge.
Does the pressure decrease to less than the specified
value within 2 minutes?
2.14VGo to Step 2Verify repair
Page 1295 of 2100
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6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0446 EVAP Canister Vent Control Malfunction
060RY00398
Circuit Description
The evaporative system includes the following
components:
Fuel tank
EVAP canister vent solenoid
Fuel tank (vapor) pressure sensor
Fuel pipes and hoses
Vapor lines
Fuel cap
Evaporative emissions canister
Purge lines
EVAP canister purge solenoid
An incorrect fuel tank pressure sensor signal is detected
by monitoring fuel tank pressure when the key is first
turned ªONº 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:
Faulty EVAP canister vent solenoid (stuck closed).
Plugged, kinked or pinched vent hose.
Shorted EVAP canister vent solenoid driver circuit.
Plugged evaporative canister.If any of these conditions are present, DTC P0446 will set.Conditions for Setting the DTC
No TP sensor, ECT sensor, Tank pressure sensor, IAT
sensor, or MAP sensor DTCs set.
Start-up engine coolant temperature and start-up
intake air temperature are more than 4C (39F) but
less than 34C(93F).
Start-up engine coolant temperature is not more than
7C (13F) greater than start-up intake air
temperature.
Fuel tank level is between 15% and 85%.
BARO is greater than 70 kPa.
Action Taken When the DTC Sets
The PCM will ON the MIL after second trip with
detected the fault.
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
The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
A history DTC P0446 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
Page 1296 of 2100
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6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0446 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
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.
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.
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 determinehow 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 Control Malfunction
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªON.º
2. Capture Failure Records data for DTC P0446 and
clear DTCs.
3. Ignition ªOFF.º
4. Remove the fuel cap.
5. Ignition ªON.º
6. Observe ªFuel Tank Pressureº on the Tech 2.
Does Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
1.51VGo to Step 3
Go to Fuel
Tank
Pressure
System
3IMPORTANT:Before continuing with diagnosis, zero
the EVAP pressure and vacuum gauges on the EVAP
pressure/purge cart J 41413 (refer to tool operating
instructions).
7. Replace the fuel cap.
8. Using the Tech 2, command the EVAP vent
solenoid ªONº (closed).
9. Connect the EVAP pressure/purge cart J 41413 to
the EVAP service port.
10.Using the EVAP pressure/purge cart J 41413,
pressurize the EVAP system to the specified value.
11. Observe ªFuel Tank Pressureº on the Tech 2.
Does Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
1.52 ± 1.69VGo to Step 4
Go to Fuel
Tank
Pressure
System
41. Maintain the EVAP pressure at 5 in. at H2O.
2. Using Tech 2, command the EVAP vent solenoid
ªOFFº (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
Page 1308 of 2100
6E±341
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0456 EVAP Very Small Leak
060R200050
Circuit Description
The evaporative system includes the following
components:
Fuel tank
EVAP canister vent solenoid
Fuel tank (vapor) pressure sensor
Vapor lines
Fuel cap
Evaporative emissions canister
Purge lines
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 ªONº, allowing
engine vacuum to draw a very small look on the
entire evaporative emissions system. After the
desired vacuum level has been achieved, the EVAP
canister purge solenoid is turned ªOFFº, 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 very small leak in the system will cause DTC
P0456 to be set.
Conditions for setting the DTC
No MAP DTC's set.
No TPS DTC's set.
No IAT DTC's set.
No ECT DTC's set.
No tank pressure sensor DTC's set.
Baro is more than 70KPa.
Fuel level is between 40% and 80%.
Throttle angle is less than 3%.
Engine speed is less than 1200 RPM.
Vehicle speed is less than 5 mph (8 km/h).
A vacuum decay condition, indicating a very small leak,
is detected during the diagnostic test.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records data.
Warm up cycles have occurred without a fault.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
Page 1310 of 2100
6E±343
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code(DTC)P0456 EVAP Very Small Leak
StepActionValue(s)Ye sNo
1Was the ªOn-Board(OBD)System Checkº performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªOFFº.
2. Remove the fuel cap.
3. Ignition ªONº.
4. Observe ªFuel Tank Pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
1.51VGo to Step 3
Go to Fuel
Tank
Pressure
System
31. Visually/physically check for the following
conditions:
Vent hose disconnected or damaged.
EVAP canister damaged.
Fuel cap damaged
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 4
41. Ignition ªONº, engine ªOFFº.
2. Install the fuel cap.
3. Review and record Tech 2 Failure Records data.
4. Operate the vehicle within Failure Records
conditions as noted.
5. Using theTech 2,monitor the ªDTCº info for DTC
P0456.
Does the Tech 2 indicate DTC P0456?
ÐGo to Step 5
Refer to
Diagnostic
Aids
51. Ignition ªONº, engine idling.
2. Observe ªFuel Tank Pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
Ð
Refer to
Diagnostic
Aids
Go to Step 6
61. Ignition ªONº, engine idling.
2. Using theTech 2, command the EVAP canister vent
solenoid ªONº (closed)
3. Observe ªEVAP canister vent solenoid operationº
second value?
4. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 7
71. Visually/physically check for the following
conditions:
Disconnected or leaking fuel tank vapor line.
Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repair
Refer to
Diagnostic
Aids
Page 1391 of 2100
6E±424
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1171 Fuel System Lean During Acceleration
060R200054
Circuit Description
The powertrain control module (PCM) internal circuitry
can identify if the vehicle fuel system is capable of
supplying adequate amounts of fuel during heavy
acceleration (power enrichment). The PCM monitors the
voltage of the oxygen sensor during power enrichment.
When a power enrichment mode of operation is
requested during ªclosed loopº operation (by heavy
acceleration), the PCM will provide more fuel to the
engine. Under these conditions the PCM should detect a
ªrichº condition (high oxygen sensor voltage). If this ªrichº
exhaust is not detected at this time, a DTC P1171 will set.
A plugged fuel filter, restricted fuel line, restricted in-tank
filter or defective fuel pump can prevent adequate
amounts of fuel from being supplied during power
enrichment mode.
Conditions for Setting the DTC
No related DTCs.
Engine is operating in ªclosed loop power enrichmentº
mode for 3 seconds.
Engine coolant temperature is above 60C (140F).
While in ªpower enrichmentº mode the oxygen sensor
voltage remains below 400 mV for 3 seconds.
Action Taken When the DTC Sets
The PCM will not turn the malfunction indicator lamp
(MIL) ªONº.
The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
A history DTC P1171 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P1171 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
A restricted fuel filter or fuel line, restricted in-tank filter,
or a defective fuel pump may supply adequate
amounts of fuel at idle, but may not be able to supply
enough fuel during heavy acceleration.
Water or alcohol in the fuel may cause low HO2S
voltage during acceleration.
Check for faulty or plugged fuel injector(s).
Check for low fuel.