2002 ISUZU AXIOM OBD port

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
68
F{20
C})
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

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
68
F{20
C})
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

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±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±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±348
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0462± Fuel Level Sensor Circuit ±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. Disconnected the fuel level sensor harness from its
connector at the fuel tank.
2. Ignition ªONº, engine ªOFFº.
3. Using a DVM, measure the voltage between the
sensor harness positive and ground wires.
Is the voltage approximately equal to the specified
value?
5 VGo to Step 6Go to Step 3
31. Ignition ªONº, engine ªOFFº.
2. With a DVM, backprobe the PCM connector at the
terminal which supplies 5 volts to the fuel level
sensor.
Is the voltage approximately equal to the specified
value?
5 VGo to Step 4Go to Step 9
41. Ignition ªONº, engine ªOFFº.
2. Fuel level sensor disconnected from wiring
harness.
3. With a DVM, probe the 5-volt supply wire at the
sensor harness.
Is the voltage approximately equal to the value
measured in Step 4?
ÐGo to Step 5Go to Step 9
5Check for open or high resistance connection in the
ground wire between the PCM and the fuel level
sensor.
Is the action complete?
ÐVerify repairÐ
6Remove the fuel level sensor and check the following:

Does the arm move freely?

Are the wires open or intermittently open when
wiggled?

Do the resistance values match the specification
chart?
Was a problem found?
ÐGo to Step 7Go to Step 9
7Replace the fuel level sensor.
Is the action complete?
ÐVerify repairÐ
8Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain 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
9Short to ground between the PCM connector and the
fuel level sensor.
Is the action complete?
ÐVerify repairÐ

6E±350
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Aids

Damaged harness±Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
fuel level display on the scan tool while moving
connectors and wiring harnesses related to the sensor.
A change in the display will indicate the location of the
fault.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. The ETC and MAP sensors share a ground at PCM
terminal D9.
9. Equates the resistance values at various float
positions to the following fuel gauge readings:
DTC P0463± Fuel Level Sensor Circuit ±High Voltage

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Disconnected the fuel level sensor harness from its
connector at the fuel tank.
2. Ignition ªONº, engine ªOFFº.
3. Using a DVM, measure the voltage between the
sensor harness positive and ground wires.
Is the voltage approximately equal to the specified
value?
5 VGo to Step 8Go to Step 3
3With the negative DVM lead connected to ground, use
the positive DVM lead to probe the sensor ground wire
with the harness still disconnected.
Does the DVM indicate a short to a voltage source?
ÐGo to Step 4Go to Step 5
4Repair short to voltage between the sensor and the
PCM.
Is the repair complete?
ÐVerify repairÐ
5With the negative DVM lead connected to ground, use
the positive DVM lead to probe the sensor positive wire
with the harness still disconnected.
Does the DVM indicate a voltage greater than the
specified value?
5 VGo to Step 4Go to Step 6
6Open circuit between the PCM connector and the fuel
level sensor?
ÐVerify repairGo to Step 7
7Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain 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
8Remove the fuel level sensor and check the following:

Does the arm move freely?

Are the wire leads shorted together?

Do the resistance values match the specification
chart?
Was a problem found?
ÐGo to Step 9Go to Step 7
9Replace the fuel level sensor.
Is the repair complete?
ÐVerify repairÐ

6E±352
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0464 ± Fuel Level Sensor Noisy Signal

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, Engine ªOffº.
2. Perform ªVisual/Physical Checkº for following
points.

Lose harness connector

Clacked harness connector

Poor wire condition

Fuel tank condition

Poor sensor condition
3. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 3
31. Disassemble fuel tank on the vehicle.
2. Check the below items.

Fuel sender
Was a problem found?
ÐGo to Step 4Go to Step 5
4Replace the Fuel sender.
Was the action complete?
ÐVerify repairGo to Step 5
5Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain 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.
Was the action completed?
ÐVerify repairÐ