2002 ISUZU AXIOM sensor
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6E±312
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0420 TWC System Low Efficiency Bank 1
T321075
Circuit Description
To control emissions of hydrocarbons (HC), carbon
monoxide (CO), and oxides of nitrogen (NOx), a
three-way catalyst (TWC) is used. The catalyst promotes
a chemical reaction which oxidizes the HC and CO
present in the exhaust gas, converting them into
harmless water vapor and carbon dioxide. The catalyst
also reduces NOx, converting it to nitrogen. The
powertrain control module (PCM) has the ability to
monitor this process using the Bank 1 HO2S 1 and the
Bank 1 HO2S 2 heated oxygen sensors. The Bank 1
HO2S 1 sensor produces an output signal which indicates
the amount of oxygen present in the exhaust gas entering
the three-way catalytic converter. The Bank 1 HO2S 2
sensor produces an output signal which indicates the
oxygen storage capacity of the catalyst; this in turn
indicates the catalyst's ability to convert exhaust gases
efficiently. If the catalyst is operating efficiently, the Bank
1 HO2S 1 signal will be far more active than that produced
by the Bank 1 HO2S 2 sensor. If the PCM detects a level
of Bank 1 HO2S 2 activity that indicates the catalyst is no
longer operating efficiently, DTC P0420 will be set.
Conditions for Setting the DTC
No related DTCs.
The engine is operating in ªclosed loopº,
Engine air load is below 99%.
Engine coolant temperature is between 70C (158F)
and 120C (248F).
Mass air flow is between 2.5 g/second and 10
g/second.
Engine speed is below 200 RPM.
Catalyst temperature is above 350C (662F).
The PCM determines that the catalyst's oxygen
storage capacity is below the acceptable threshold.
Intake Air Temperature is between ±10C (14F) and
70C (158F).
Throttle angle is less than 1.5%.Barometric Pressure is more than 72 kPa.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
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 P0420 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0420 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 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.
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. A failed catalyst
Page 1282 of 2100
6E±315
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0430 TWC System Low Efficiency Bank 2
T321075
Circuit Description
To control emissions of hydrocarbons (HC), carbon
monoxide (CO), and oxides of nitrogen (NOx), a
three-way catalyst (TWC) is used. The catalyst promotes
a chemical reaction which oxidizes the HC and CO
present in the exhaust gas, converting them into
harmless water vapor and carbon dioxide. The catalyst
also reduces NOx, converting it to nitrogen. The
powertrain control module (PCM) has the ability to
monitor this process using the Bank 2 HO2S 1 and the
Bank 2 HO2S 2 heated oxygen sensors. The Bank 2
HO2S 1 sensor produces an output signal which indicates
the amount of oxygen present in the exhaust gas entering
the three-way catalytic converter. The Bank 2 HO2S 2
sensor produces an output signal which indicates the
oxygen storage capacity of the catalyst; this in turn
indicates the catalyst's ability to convert exhaust gases
efficiently. If the catalyst is operating efficiently, the Bank
2 HO2S 1 signal will be far more active than that produced
by the Bank 2 HO2S 2 sensor. If the PCM detects a level
of Bank 2 HO2S 2 activity that indicates the catalyst is no
longer operating efficiently, DTC P0430 will be set.
Conditions for Setting the DTC
No related DTCs.
The engine is operating in ªclosed loopº.
Engine air load is below 99%.
Engine coolant temperature is between 70C (158F)
and 120C (248F).Mass air flow is between 2.5 g/second and 10
g/second.
Change in engine load is below 8%.
Engine speed is below 200 RPM.
Catalyst temperature is above 350C (662F).
The PCM determines that the catalyst's oxygen
storage capacity is below the acceptable threshold.
Intake air temperature is between ±20C (4F) and
70C (158F).
Throttle angle is less than 1.5%.
Barometric Pressure is more than 72 kPa.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
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 P0430 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0430 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
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
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 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.