Isuzu Trooper (1998-2002 year). Manual - part 529

6E–486

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Symptoms

Default Section(s)

Initial Diagnosis

Excessive Exhaust Emissions or
Odors

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.

EGR System Check, Exhaust
Diagnosis, Calibration ID/Service
Bulletins

Dieseling, Run-On

1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.

—

Backfire

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.

Exhaust System Diagnosis,
Intake Casting Flash, Ignition
System Check

Misfire

1. OBD system check.
2. Ignition system.
3. Fuel system diagnosis.
4. Fuel injector and fuel injector

balance test.

Vibrations, Transmission,
Driveshaft and Axle

Catalyst Monitor

1. OBD system check.
2. Careful visual/physical inspection.
3. Heated oxygen sensors.

Exhaust System

Fuel Trim

1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
4. Heated oxygen sensors, MAF

sensors.

Exhaust System Intake Air
System

Evaporative Emissions

1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.

—

Heated Oxygen Sensors

1. OBD system check.
2. Careful visual/physical inspection.

Exhaust System

6E–487

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

On Vehicle Service  Crankshaft

Position (CKP) Sensor

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the electrical connector to the CKP

sensor.

3. Remove one bolt and the CKP sensor from the right

side of the engine block, just behind the mount.

NOTE: Use caution to avoid any hot oil that might drip
out.

TS22909

Inspection Procedure

1. Inspect the sensor O-ring for cracks or leaks.
2. Replace the O-ring if it is worn or damaged.
3. Lubricate the new O-ring with engine oil.
4. Install the lubricated O-ring.

Installation Procedure

1. Install the CKP sensor in the engine block.
2. Install the CKP sensor mounting bolt.

Tighten

D

Tighten the mounting bolt to 9 N·m (78 lb in.).

TS22909

3. Connect the electrical connector to the CKP sensor.
4. Connect the negative battery cable.

Engine Coolant Temperature

(ECT) Sensor

Removal Procedure

NOTE: Care must be taken when handling the engine
coolant temperature (ECT) sensor.  Damage to the ECT
sensor will affect proper operation of the fuel injection
system.

1. Disconnect the negative battery cable.
2. Drain the radiator coolant.  Refer to 

Draining and

Refilling Cooling System in Engine Cooling section.

3. Disconnect the electrical connector.

014RY00001

6E–488

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

4. Remove the ECT sensor from the coolant crossover.

014RY00002

Installation Procedure

1. Apply sealer or the equivalent to the threads of the

ECT sensor.

2. Install the ECT sensor in the coolant crossover.

Tighten

D

Tighten the ECT sensor to 30 N·m (22 lb ft.).

014RY00002

3. Connect the electrical connector.

014RY00003

4. Fill the radiator with coolant.  Refer to 

Draining and

Refilling Cooling System in Engine Cooling section.

5. Connect the negative battery cable.

Heated Oxygen Sensor (HO2S)

Removal Procedure

1. Disconnect the negative battery cable.
2. Locate the four oxygen sensors.

060RW008

6E–489

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

D

Bank 1 sensor 1 is mounted on the exhaust pipe
ahead of the right-hand catalytic converter.

TS22912

D

Bank 1 sensor 2 is mounted behind the right-hand
catalytic converter.

TS22913

D

Bank 2 sensor 1 is mounted on the exhaust pipe
ahead of the left-hand catalytic converter.

TS22914

D

Bank 2 sensor 2 is mounted behind the left-hand
catalytic converter.

TS22915