2002 ISUZU AXIOM engine

6E±329
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

6E±330
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0446± EVAP Canister Vent Control Malfunction

 
StepNo Ye s Value(s) Action
51. Disconnect the large vent hose (marked ªAIRº) from
the EVAP canister.
2. Switch the rotary switch on the cart J 41413 to
ªPURGE.º
3. Ignition ªON,º engine idling at normal operating
temperature.
4. Observe vacuum gauge for 5 seconds while holding
the engine speed at 2500 RPM.
Does the vacuum remain less than the specified value?
30 in. H2OGo to Step 6Go to Step 8
61. Inspect the vent hose between the EVAP canister
and the EVAP canister vent solenoid for kinks,
pinched areas, or any other form of blockage.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐGo to Step 9Go to Step 7
7Replace the EVAP canister vent solenoid.
Is the action complete?
ÐGo to Step 9Ð
8Replace the EVAP canister.
Is the action complete?
ÐGo to Step 9Ð
91. Using Tech 2, command the EVAP canister vent
solenoid ªONº (closed).
2. Using the EVAP pressure/purge cart J 41413,
pressurize and monitor the EVAP system to 15 in.
H
2O.
3. Switch the rotary switch on cart J 41413 to ªHOLD.º
4. Using the Tech 2, command the EVAP canister vent
solenoid ªOFFº (open) while observing the EVAP
pressure gauge on cart J 41413.
Does the EVAP pressure return to the specified value
within 5 seconds?
0 in. H2OVerify repairGo to Step 2

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.

6E±332
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0447 EVAP Vent Solenoid 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 ªONºand operate the acceleration pedal
for 3 or 4 times.
4. Observe the EVAP vent solenoid reading on the
Tech 2.
Is the EVAP vent solenoid reading to ªONº?
Ð
Refer to
Diagnostic
Aids
Go to Step 3
3Check the power supply circuit.
1. Ignition is ªOFFº.
2. Disconnect the canister vent solenoid valve.
3. Ignition is ªONº.
4. Using a DVM, measure at the EVAP vent 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 vent solenoid valve.
1. Ignition is ªOFFº.
2. Disconnect the canister vent solenoid valve.
3. Disconnect the PCM.
4. Check the circuit between EVAP vent solenoid
connector and PCM connector.
Is the problem found?
ÐGo to Step 5Ð
5Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
6Check the canister vent solenoid valve.
Using a DVM, measure resistance for vent solenoid
valve connector terminal.
Is the vent solenoid valve resistance within the
specified values?
Ð
21.8-28.5

(at
68
F{20
C})
Ð
7Replace the canister vent solenoid valve.
Is the action complete?
ÐVerify repairÐ
8Replace 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

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.

6E±334
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0448 EVAP Vent Solenoid 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 vent solenoid reading on the
Tech 2.
Is the EVAP vent solenoid reading near the specified
value?
0%
Refer to
Diagnostic
Aids
Go to Step 3
3Check the signal circuit for canister vent solenoid valve.
1. Ignition is ªOFFº.
2. Disconnect the canister vent solenoid valve.
3. Disconnect the PCM.
4. Check the circuit between EVAP vent 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 vent solenoid valve. Using a DVM,
measure resistance for purge solenoid valve connector
terminal.
Is the vent solenoid valve resistance within the
specified values?
21.8-28.5

(at
68
F{20
C})
Go to Step 7Go to Step 6
6Replace the canister vent 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

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.

6E±336
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0452 ± Tank Pressure Sensor Low Voltage

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªONº, engine ªOFFº, review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor ªDTCº info for DTC P0452
until the DTC P0452 test runs. Note the result.
Does the Tech 2 indicates DTC P0452 or P0452/P0107
failed this ignition?
Ð
P0452/P0107
turn on
Go to
Step 3
P0452 turns on
Go to
Step 6
Refer to
Diagnostic
Aids
31. Ignition ªOFFº.
2. Disconnect connector at the PCM.
3. Ignition ªONº.
4. At the PCM connector, measure voltage with a DVM
at F54 and S37 terminals.
Was the voltage in range?
4±6 VGo to Step 4Go to Step 10
41. Ignition ªOFFº.
2. Connect the PCM connector to the PCM.
3. Backprobe with a DVM at fuel tank pressure sensor
between 5 V reference terminal and sensor ground
terminal.
Was the voltage within range?
4±6 V
For P0452 go
to
Step 5 and
for P0107, go
to diagnosis
section.
Go to Step 5
51. Locate open wiring of 5 volt reference circuit from
the PCM to fuel tank pressure sensor.
2. Repair wiring harness.
Is the action complete?
ÐVerify repairÐ
61. Ignition ªONº
2. At the PCM connector, backprobe with a DVM at the
sensor output for the voltage.
Was voltage within the range?
Less than
0.2 V
Go to Step 7Go to Step 10
7At the sensor output terminal, backprobe with a DVM at
the sensor output
Was voltage within range?
Less than
0.2 V
Go to Step 9Go to Step 8
81. Locate open circuit or short circuit to ground line.
2. Repair the harness.
Is the action complete?
ÐVerify repairÐ