2002 ISUZU AXIOM Service Repair Manual

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Page 1305 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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 co

Page 1306 of 2100

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

Page 1307 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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?

Page 1308 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±341
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0456 EVAP Very Small Leak
060R200050
Circuit Description
The evaporative system includes the following
components:

6E±341
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0456 EVAP Very Small Leak
060R200050
Circuit Description
The evaporative system includes the following
components:
Fuel tank
EVAP canister vent solenoid
Fuel tank (vapor) pressure sensor
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 very small look 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 very small leak in the system will cause DTC
P0456 to be set.
Conditions for setting the DTC
No MAP DTC's set.
No TPS DTC's set.
No IAT DTC's set.
No ECT DTC's set.
No tank pressure sensor DTC's set.
Baro is more than 70KPa.
Fuel level is between 40% and 80%.
Throttle angle is less than 3%.
Engine speed is less than 1200 RPM.
Vehicle speed is less than 5 mph (8 km/h).
A vacuum decay condition, indicating a very small leak,
is detected during the diagnostic test.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records data.
Warm up cycles have occurred without a fault.
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.

Page 1309 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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 cle

Page 1310 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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
G

Page 1311 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±344
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0461 Fuel Level Sensor Performance
060RY00163
Circuit Description
The fuel level sensor is an important input to powe

Page 1312 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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

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