2002 ISUZU AXIOM ECU
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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 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 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 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.
Page 1298 of 2100
6E±331
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0447 EVAP Vent Solenoid 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 vent 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 P0447 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.DTC P0447 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 vent valve 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 P0447 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 P0447 Diagnostic Chart may
isolate the cause of the fault.
Page 1300 of 2100
6E±333
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0448 EVAP Vent solenoid 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 vent 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 P0448 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.DTC P0448 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 vent valve 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 P0448 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 P0448 Diagnostic Chart may
isolate the cause of the fault.
Page 1302 of 2100
6E±335
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0452 Fuel Tank Pressure Sensor (Vapor Pressure Sensor) Low Voltage
060R200050
Circuit Description
The powertrain control module (PCM) monitors fuel tank
pressure sensor (Vapor pressure sensor) of the
Enhanced Evap system. When the tank pressure output
indicates low voltage, PCM will set DTC P0452.
Conditions for Setting the DTC
Tank sensor output is less than 0.2 volts for 12.5 sec.
100 test failures within a 200 tests.
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 was set as Freeze Frame and in 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 P0402 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0404 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:
Open circuit of 5 volt reference line ± Inspect wiring
harness from PCM to the sensor. The PCM turns
P0452, and P0107 at the same time.
Open circuit or short circuit to ground line ± Inspect
wiring harness from PCM to the sensor. The PCM turns
P0452 and P0107 at the same time.
Tank fuel pressure sensor malfunction may cause
P0452.
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.
Page 1305 of 2100
6E±338
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0453 Fuel Tank Pressure Sensor (Vapor Pressure Sensor) High Voltage
060R200050
Circuit Description
The powertrain control module (PCM) monitors fuel tank
pressure sensor (Vapor pressure sensor) of the
Enhanced Evap system. When the tank pressure output
indicates high voltage , PCM will set DTC P0453.
Conditions for Setting the DTC
Tank sensor output is more than 4.9 volts for 12.5 sec.
100 test failures within a 200 tests.
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 was set as Freeze Frame and in 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 P0453 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
Info function or by disconnecting the PCM battery feed.
Diagnostic Aids
Check for the following conditions:
Open circuit of sensor ground line ± Inspect wiring
harness from PCM to the sensor. The PCM turns
P0453, and P0108 at the same time.
Open circuit or short circuit to 5 volt reference line ±
Inspect wiring harness from PCM to the sensor. The
PCM turns P0453 and P0108 at the same time.
Tank fuel pressure sensor malfunction may cause
P0453.
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.