Isuzu 2000 Trooper Workshop Manual page 1211

6E–342
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0453 – Fuel Tank Pressure Sensor High Voltage
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
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?
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 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?
5 1. Locate open wiring of ground line from the PCM to
fuel tank pressure sensor.
2. Repair wiring harness.
Is the action complete?
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?
7 At the sensor output terminal, backprobe with a DVM at
the sensor output.
Was the voltage within range?
8 1. Locate open circuit or short circuit to ground line.
2. Repair the harness.
Is the action complete?
9 Replace the tank pressure sensor.
Is the action complete?
Action Value(s) Yes
— Go to Step 2
P0453/P0108
turn on
Go to Step 3
P0452 turns on
— Go to Step 6
Go to Step 4
4–6 V
For P0453 go
to Step 6 and
for P0108, go
to diagnosis
section.
4–6 V
— Verify repair
More than
4.9 V Go to Step 7
More than
Go to Step 9
4.9 V
— Verify repair
— Verify repair
No
Go to OBD
System
Check
Refer to
Diagnostic
Aids
Go to Step 10
Go to Step 5
—
Go to Step 10
Go to Step 8
—
—