Isuzu Trooper (1998-2002 year). Manual — part 638
6E–200
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Symptoms
Initial Diagnosis
Default Section(s)
Hesitation, Sag, Stumble
1. OBD system check.
2. AP.
3. MAP output check.
4. Fuel system diagnosis.
5. Injector system.
Generator Output Voltage (refer
to
Chassis Electrical),
Calibration ID/Service Bulletins,
Ignition System Check
Rough, Unstable, or Incorrect Idle,
Stalling
1. OBD system check.
2. Fuel injector test.
MAP Output Check, Throttle
Linkage, A/C Clutch Control
Circuit Diagnosis, Calibration
ID/Service Bulletins, Generator
Output Voltage (refer to
Chassis
Electrical), Exhaust Diagnosis
Poor Fuel Economy
1. OBD system check.
2. Careful visual/physical inspection.
3. Injector system.
4. Cooling system.
TCC Operation, Exhaust
System (refer to
Engine
Exhaust)
Engine Cranks But Will Not Run
1. OBD system check.
Fuel System Electrical
Diagnosis, Fuel System
Diagnosis, Fuel Injector Test.
Excessive Exhaust Emissions or
Odors
1. OBD system check.
2. Emission test.
3. Cooling system.
4. Fuel system diagnosis.
5. Fuel injector test.
6. Injector system.
7. MAP output check.
Exhaust Diagnosis, Calibration
ID/Service Bulletins
Dieseling, Run-On
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
—
6E–201
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
On–Vehicle Service
Camshaft Position (CMP)
Sensor
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the electrical connector to the CMP
sensor.
035RW071
3. Remove the CMP sensor retaining bolt from the
cylinder head cover.
035RW075
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 CMP sensor in the cylinder head cover.
2. Install the CMP sensor retaining bolt.
Tighten
D
Tighten the retaining bolt to 9 N·m (78 lb in.).
035RW075
3. Connect the electrical connector to the CMP sensor.
035RW071
4. Connect the negative battery cable.
6E–202
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Crankshaft Position (CKP)
Sensor
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the under cover.
035RW091
3. Disconnect the electrical connector to the CKP
sensor.
4. Remove one bolt and the CKP sensor from the left
side of the engine block.
NOTE: Use caution to avoid any hot oil that might drip
out.
035RW090
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.).
035RW090
3. Connect the electrical connector to the CKP sensor.
4. Install the under cover.
035RW091
5. Connect the negative battery cable.
6E–203
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
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.
3. Disconnect the electrical connector.
4. Remove the ECT sensor from the front side of the
intake manifold.
035RW058
Installation Procedure
1. Apply sealer (LOCTITE 262) or the equivalent to the
threads of the ECT sensor.
2. Install the ECT sensor in the front side of the intake
manifold.
Tighten
D
Tighten the ECT sensor to 19 N·m (14 lb ft.).
3. Connect the electrical connector.
035RW058
4. Fill the radiator with coolant. Refer to
Draining and
Refilling Cooling System in Engine Cooling.
5. Connect the negative battery cable.
Intake Air Temperature (IAT)
Sensor
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the electrical connector from the IAT
sensor.
3. Remove the IAT sensor from the intake air duct by
using a rocking motion while pulling the sensor.
035RW056
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