check engine ISUZU AXIOM 2002 Service Repair Manual

6E±339
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0453 ± Fuel Tank Pressure Sensor 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. 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 P0453
until the DTC P0453 test runs. Note the result.
Does the Tech 2 indicates DTC P0452 or P0452/P0107
failed this ignition?
Ð
P0453/P0108
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 of voltage?
4±6 VGo to Step 4Go to Step 10
41. Ignition ªOFFº.
2. Connect the PCM connector to the PCM.
3. Disconnect sensor harness at fuel pressure sensor.
Measure voltage with a DVM at the end of the tank
pressure wiring between 5 V reference terminal and
sensor ground terminal.
Was the voltage within range?
4±6 V
For P0453 go
to
Step 6 and
for P0108, go
to diagnosis
section.
Go to Step 5
51. Locate open wiring of ground line 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 range?
More than
4.9 V
Go to Step 7Go to Step 10
7At the sensor output terminal, backprobe with a DVM at
the sensor output.
Was the voltage within range?
More than
4.9 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

6E±340
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0453 ± Fuel Tank Pressure Sensor High Voltage

 
StepNo Ye s Value(s) Action
9Replace the tank pressure sensor.
Is the action complete?
ÐVerify repairÐ
10Replace 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

6E±342
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

A history DTC P0456 will clear after 40 consecutive trip
cycle during which the warm up cycles have occurred
without a fault.

DTC P0456 can be cleared 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 source vacuum line, EVAP purge line, EVAP
vent hose or fuel tank vapor line. to wire connection.

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 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 often the condition that caused the DTC to be
set occurs.
This may assist in diagnosing the condition.

6E±343
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code(DTC)P0456 EVAP Very Small Leak

StepActionValue(s)Ye sNo
1Was the ªOn-Board(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
31. Visually/physically check for the following
conditions:

Vent hose disconnected or damaged.

EVAP canister damaged.

Fuel cap damaged
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 4
41. Ignition ªONº, engine ªOFFº.
2. Install the fuel cap.
3. Review and record Tech 2 Failure Records data.
4. Operate the vehicle within Failure Records
conditions as noted.
5. Using theTech 2,monitor the ªDTCº info for DTC
P0456.
Does the Tech 2 indicate DTC P0456?
ÐGo to Step 5
Refer to
Diagnostic
Aids
51. Ignition ªONº, engine idling.
2. Observe ªFuel Tank Pressureº on the Tech 2.
Does the Tech 2 indicate ªFuel Tank Pressureº at the
specified value?
Ð
Refer to
Diagnostic
Aids
Go to Step 6
61. Ignition ªONº, engine idling.
2. Using theTech 2, command the EVAP canister vent
solenoid ªONº (closed)
3. Observe ªEVAP canister vent solenoid operationº
second value?
4. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 7
71. Visually/physically check for the following
conditions:

Disconnected or leaking fuel tank vapor line.

Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repair
Refer to
Diagnostic
Aids

6E±345
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0461± Fuel Level Sensor Performance

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. Install Tech 2.
3. Ignition ªOnº, Engine ªOffº.
4. Check DTC P0462, P0463.
Was the DTC stored?
Ð
Go to
applicable
DTC table
Go to Step 3
3Check DTC P0464.
Was the DTC stored?
Ð
Go to DTC
P464 table
Go to Step 4
41. Ignition ªOffº, Engine ªOffº.
2. Replace the fuel level sensor.
Was the action complete?
ÐVerify repairÐ

6E±347
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
8. The following chart can be used to check the
sending unit:

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

6E±354
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0502 ± VSS Circuit Low Input

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Does the speedometer work?ÐGo to Step 10Go to Step 3
31. Disconnect the VSS connector.
2. Ignition ªONº.
3. Using a test light to battery +, probe the connector
ground wire.
Did the light illuminate?
ÐGo to Step 5Go to Step 4
4Repair the sensor ground.
Is the action complete?
ÐVerify repairÐ
51. Ignition ªONº, sensor disconnected.
2. Using a DVM, measure at the VSS connector
between ground and voltage supply.
Was the measurement near the specified value?
Battery
voltage
Go to Step 7Go to Step 6
6Repair the open or short to ground which may have
blown the meter fuse.
Is the action complete?
ÐVerify repairÐ
71. Ignition ªONº, VSS disconnected.
2. Using a DVM, measure at the VSS connector
between ground and the wire from the
speedometer.
Was the measurement near the specified value?
7.5-8 VGo to Step 9Go to Step 8
8Check for an open or short circuit between the
speedometer and the VSS.
Was an open or short circuit located?
ÐVerify repairGo to Step 9
9Replace the speedometer.
Is the action complete?
ÐVerify repairÐ