Isuzu Trooper 1999 Workshop Manual page 1264

Symptoms
Excessive Exhaust Emissions or
Odors
Dieseling, Run-On
Backfire
Misfire
Catalyst Monitor
Fuel Trim
Evaporative Emissions
Heated Oxygen Sensors
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Initial Diagnosis
1. OBD system check.
2. Emission test.
3. Cooling system.
4. Fuel system diagnosis.
5. Fuel injector and fuel injector
balance test.
6. EVAP emission canister purge
valve.
7. Crankcase ventilation system.
8. Ignition system.
9. MAP output check.
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
1. OBD system check.
2. Ignition system.
3. Fuel system diagnosis.
4. Fuel injector and fuel injector
balance test.
5. EGR operation, EGR system
check.
1. OBD system check.
2. Ignition system.
3. Fuel system diagnosis.
4. Fuel injector and fuel injector
balance test.
1. OBD system check.
2. Careful visual/physical inspection.
3. Heated oxygen sensors.
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
4. Heated oxygen sensors, MAF
sensors.
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
1. OBD system check.
2. Careful visual/physical inspection.
6E–463
Default Section(s)
EGR System Check, Exhaust
Diagnosis, Calibration ID/Service
Bulletins
—
Exhaust System Diagnosis,
Intake Casting Flash, Ignition
System Check
Vibrations, Transmission,
Driveshaft and Axle
Exhaust System
Exhaust System Intake Air
System
—
Exhaust System