sensor ISUZU AXIOM 2002 Service Repair Manual
Page 1283 of 2100
6E±316
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
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 for
damage. If the harness appears to be OK, observe the
display on the Tech 2 while moving connectors and
wiring harnesses related to the sensor. A change in the
display will indicate the location of the fault.
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.
7. Difficulty completing the DTC P0430 ªStatus This
Ignº, test may be encountered in areas where test
conditions cannot be maintained easily, especially in
urban areas. To minimize the amount of driving
required to complete the DTC P0430 ªStatus This
Ignº, test, use the following procedure:
Allow the engine to warm up completely.
With the vehicle in ªParkº, monitor mass air flow on
the Tech 2 and hold part throttle to maintain a
reading of over 12 g/second for at least 2 minutes.
This will achieve the ªwarm catalystº required for
running the test.
Operate the vehicle in second or third gear to remain
in the DTC P0430 test conditions described in
ªConditions for Setting the DTCº as much as
possible. If you must stop the vehicle, maintain the
ªwarm catalystº criteria as follows:
± Place the vehicle in ªParkº or ªNeutralº,
± Hold part throttle to maintain a mass air flow
reading of over 15 g/second for the duration of the
stop.
The ªTWC Monitor Test Counterº displayed on the Tech 2
may be used to monitor the progress of the TWC
diagnostic. To complete the TWC diagnostic with a good
catalyst, the counter must be allowed to increment to 49
samples and roll over to 0 at least twice.
Page 1285 of 2100
6E±318
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0440 EVAP System
060RY00398
Circuit Description
The evaporative system includes the following
components:
Fuel tank
EVAP canister purge duty solenoid valve
Fuel tank (vapor) pressure sensor
Fuel pipes and hoses
Vapor lines
Fuel cap
Evaporative emissions canister
Purge lines
EVAP canister vent 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 ªONº, 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:
Disconnected or faulty fuel tank pressure sensor
Missing or faulty fuel cap
Disconnected, damaged, pinched, or blocked EVAP
purge line
Disconnected or damaged EVAP vent hoseDisconnected, damaged, pinched, or blocked fuel tank
vapor line
Disconnected or faulty EVAP canister duty solenoid
Open ignition feed circuit to the EVAP canister vent
solenoid
Damaged EVAP canister
Leaking fuel sender assembly O-ring
Leaking fuel tank or fuel filler neck
Any of the above conditions can set DTC P0440.
Conditions for Setting the DTC
No TP sensor, IAT sensor, ECT sensor, or MAP sensor
DTCs set.
Start-up engine coolant temperature is less than 32C
(90F).
Start-up engine coolant temperature is not more than
7C (13F) greater than start-up intake air
temperature.
Start-up intake air temperature is greater than 4C
(39F) .
Start-up intake air temperature is not more than 2C
(4F) greater than start-up engine coolant
temperature.
Vehicle speed is less than 5 mph (8 km/h).
Throttle position is greater than 3%.
Minimal fuel slosh.
BARO is greater than 70 kPa.
The EVAP system is unable to achieve or maintain
vacuum during the diagnostic test.
Page 1286 of 2100
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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 1288 of 2100
6E±321
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
6E±322
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 1291 of 2100
6E±324
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0444 EVAP Purge Control Circuit Open
060RY00398
Circuit Description
The canister purge solenoid valve is controlled by the
Power Train Control Module (PCM).The PCM monitors
vacuum level via the fuel tank pressure sensor input.
At an appropriate time, the EVAP canister purge solenoid
is ªON,º allowing engine vacuum to draw a small vacuum
on the entire evaporative emissions system.
Conditions for setting the DTC
The Ignition is ªONº.
Engine is running.
System voltage is between 11.5 volts and 16 volts.
Action Taken When the DTC Sets
The PCM will not illuminate the malfunction indicator
lamp (MIL).
The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.
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 P0444 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.DTC P0444 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:
Poor connections.
Mis routed harness.
Rubbed through wire insulation.
Broken wire inside the insulation.
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 for
damage. If the harness appears to be OK, observe the
EVAP purge solenoid display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P0444 cannot be duplicated, the
information included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.
If it is determined that the DTC occurs intermittently,
performing the DTC P0444 Diagnostic Chart may
isolate the cause of the fault.
Page 1292 of 2100
6E±325
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0444 EVAP Purge Control Circuit Open
StepActionValue(s)Ye sNo
1Was the ªOn-Board (OBD) System Checkº performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Install the Tech 2.
2. Ignition is ªONº,
3. Engine is ªONº and operate the accelerator pedal
for 3 or 4 times.
4. Observe the EVAP purge solenoid reading on the
Tech 2.
Is the EVAP purge solenoid reading near the specified
value?
More than 1%
Refer to
Diagnostic
Aids
Go to Step 3
3Check the power supply circuit.
1. Ignition is ªOFFº.
2. Disconnect the canister purge solenoid valve.
3. Ignition is ªONº.
4. Using a DVM, measure at the EVAP purge solenoid
connector between ground and voltage supply.
Was the measurement near the specified value?
Battery
voltage
Go to Step 4Go to Step 5
4Check the signal circuit for the EVAP purge solenoid.
1. Ignition is ªOFFº.
2. Disconnect the canister purge solenoid valve.
3. Disconnect the PCM.
4. Check the circuit between EVAP purge solenoid
connector and PCM connector.
Is the problem found?
ÐGo to Step 5Go to Step 6
5Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
6Check the canister purge solenoid valve. Using a DVM,
measure resistance for purge solenoid valve connector
terminal.
Is the purge solenoid valve resistance within the
specified values?
25±30 (at
68F{20C})
Go to Step 8Go to Step 7
7Replace the canister purge solenoid valve.
Is the action complete?
ÐVerify repairÐ
8Replace the
IMPORTANT:The replacement PCM must be
programmed.
Refer to
ON-Vehicle Service in Power Control Module
and Sensors for procedures
.
And also refer to latest Service Bulletin. Check to see
if the latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
ÐVerify repairÐ
Page 1293 of 2100
6E±326
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0445 EVAP Purge Control Circuit Short
060RY00398
Circuit Description
The canister purge solenoid valve is controlled by the
Power Train Control Module (PCM). The PCM monitors
vacuum level via the fuel tank pressure sensor input.
At an appropriate time, the EVAP canister purge solenoid
is ªON,º allowing engine vacuum to draw a small vacuum
on the entire evaporative emissions system.
Conditions for setting the DTC
The Ignition is ªONº.
Engine is running.
System voltage is between 11.5 volts and 16 volts.
Action Taken When the DTC Sets
The PCM will not illuminate the malfunction indicator
lamp (MIL).
The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.
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 P0445 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.DTC P0445 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:
Poor connections.
Misrouted harness.
Rubbed through wire insulation.
Broken wire inside the insulation.
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 for
damage. If the harness appears to be OK, observe the
EVAP purge solenoid display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P0445 cannot be duplicated, the
information included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.
If it is determined that the DTC occurs intermittently,
performing the DTC P0445 Diagnostic Chart may
isolate the cause of the fault.
Page 1294 of 2100
6E±327
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0445 EVAP Purge Control Circuit Short
StepActionValue(s)Ye sNo
1Was the ªOn-Board (OBD) System Checkº performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Install the Tech 2.
2. Ignition is ªONº,
3. Observe the EVAP purge solenoid reading on the
Tech 2.
Is the EVAP purge solenoid reading near the specified
value?
0%
Refer to
Diagnostic
Aids
Go to Step 3
3Check the signal circuit for canister purge solenoid
valve.
1. Ignition is ªOFFº.
2. Disconnect the canister purge solenoid valve.
3. Disconnect the PCM.
4. Check the circuit between EVAP purge solenoid
connector and PCM connector.
Is the problem found?
ÐGo to Step 4Go to Step 5
4Repair the circuit as necessary. Is the action complete?
ÐVerify repairÐ
5Check the canister purge solenoid valve.
Using a DVM, measure resistance for purge solenoid
valve connector terminal.
Is the purge solenoid valve resistance within the
specified values?
25±30 (at
68F{20C})
Go to Step 7Go to Step 6
6Replace the canister purge solenoid valve.
Is the action complete?
ÐVerify repairÐ
7Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed.
Refer to
ON-Vehicle Service in Power Control Module
and Sensors for procedures.
And also refer to latest Service Bulletin.
Check to see if the latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
ÐVerify repairÐ
Page 1295 of 2100
6E±328
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.