Isuzu Trooper (2000 year). Manual — part 303
6E–341
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0453 Fuel Tank Pressure Sensor (Vapor Pressure Sensor) High Voltage
D06RY00178
Circuit Description
The powertrain control module (PCM) monitors fuel tank
pressure sensor (Vapor pressure sensor) of the
Enhanced Evapo system. When the tank pressure output
indicates high voltage , PCM will set DTC P0453.
Conditions for Setting the DTC
D
Tank sensor output is more than 4.9 volts for 12.5 sec.
D
100 test failures within a 200 tests.
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) as soon as failure detected.
D
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
D
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P0453 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
D
Info function or by disconnecting the PCM battery feed.
Diagnostic Aids
Check for the following conditions:
D
Open circuit of sensor ground line – Inspect wiring
harness from PCM to the sensor. The PCM turns
P0453, and P0108 at the same time.
D
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.
D
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.
6E–342
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0453 – Fuel Tank Pressure Sensor High Voltage
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Ignition “ON,” engine “OFF”, review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor “DTC” 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?
—
P0453/P0108
turn on
Go to
Step 3
P0452 turns on
Go to
Step 6
Refer to
Diagnostic
Aids
3
1. Ignition “OFF”.
2. Disconnect connector at the PCM.
3. Ignition “ON”.
4. At the PCM connector, measure voltage with a
DVM at F54 and S37 terminals.
Was the voltage in range of voltage?
4–6 V
Go to
Step 4
Go to
Step 10
4
1. Ignition “OFF”.
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
5
1. Locate open wiring of ground line from the PCM to
fuel tank pressure sensor.
2. Repair wiring harness.
Is the action complete?
—
Verify repair
—
6
1. Ignition “ON”.
2. At the PCM connector, backprove with a DVM at the
sensor output for the voltage.
Was voltage within the range?
More than
4.9 V
Go to
Step 7
Go to
Step 10
7
At 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 9
Go to
Step 8
8
1. Locate open circuit or short circuit to ground line.
2. Repair the harness.
Is the action complete?
—
Verify repair
—
9
Replace the tank pressure sensor.
Is the action complete?
—
Verify repair
—
6E–343
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0453 – Fuel Tank Pressure Sensor High Voltage
(Cont'd)
Step
No
Yes
Value(s)
Action
10
Replace 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?
—
Verify repair
—
6E–344
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0456 EVAP Very Small Leak
D06RY00128
Circuit Description
The evaporative system includes the following
components:
D
Fuel tank
D
EVAP canister vent solenoid
D
Fuel tank pressure sensor
D
Vapor lines
D
Fuel cap
D
Evaporative emissions canister
D
Purge lines
D
EVAP canister purge solenoid
The evaporative leak detection diagnostic strategy
is based on applying vacuum to the EVAP
systemand monitoring vacuum decay. The
powertrain control module(PCM)monitors vacuum
level via the fuel tank presuure sensor input .At an
appropriate time, the EVAP canister purge
solenoid and the EVAP canister vent solenoid are
turned “ON,” allowing engine vacuum to draw a
very small on the entire evaporative emissions
system. After the desired vacuum level has been
achieved, the EVAP canister purge solenoid is
turned “OFF”, 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
D
No MAP DTC’s set.
D
No TPS DTC’s set.
D
No IAT DTC’s set.
D
No ECT DTC’s set.
D
No tank pressure sensor DTC’s set.
D
Baro is more than 70KPa.
D
A vacuum decay condition, indicating a very small leak,
is detected during the diagnostic test.
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
D
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
D
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P0456 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.
D
DTC P0456 can be cleared using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
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