1998 ISUZU TROOPER Remove engine

6E±216
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
2. Install the fuel return adapter.
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3. Install the rear side engine hanger. Tighten the rear
side engine hanger fixing bolts to specified torque.
Torque: 19 N´m (14 lb ft)
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4. Install the cylinder head. Refer to engine mechanical
section.
5. Install the intercooler assembly.
6. Connect the negative battery cable.
Rail Pressure (RP) Sensor
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the air cleaner cover and air duct.
3. Remove the intercooler assembly.
4. Remove the injector oil pipe.
5. Remove the intake throttle valve.
6. Remove the cylinder head cover noise inselation.
7. Remove the cylinder head cover.
8. Remove the RP sensor.
Installation Procedure

Refer to the RP Sensor Programming.
1. Install the RP sensor.
2. Install the cylinder head cover.
3. Install the cylinder head cover noise inselation.
4. Install the intake throttle valve.
5. Install the injector oil pipe.
6. Install the intercooler assembly and tighten
intercooler assembly fixing bolts to specified torque.
Torque: 20 N´m (14 lb ft)
7. Install the air cleaner cover and air duct.
8. Connect the negative battery cable.
Fuel Tank
Removal Procedure
Refer toEngine Fuel in 4JX1 Engine section.
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6E±217 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Throttle Body (TB)
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the cover of the intercooler.
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3. Remove the bolts and the left side bracket to the
intercooler.
4. Remove the air duct with bracket from the intercooler.
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5. Remove the throttle body assembly from the intake
manifold.
6. Disconnect the ITP sensor electrical connector.
Installation Procedure
NOTE: Do not use solvent of any type when you clean the
gasket surfaces on the intake manifold and the throttle
body assembly. The gasket surfaces and the throttle body
assembly may be damaged as a result.
If the throttle body gasket needs to be replaced,
remove any gasket material that may be stuck to the
mating surfaces of the manifold.

Do not leave any scratches in the aluminum casting.
1. Install the throttle body assembly to the intake
manifold and the air duct with bracket between
throttle body and intercooler.
Torque: 20 N´m (14 Ib ft)
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2. Connect the ITP sensor electrical connector and
throttle motor control connector.
3. Install the bracket to the intercooler.
4. Install the cover of intercooler.
5. Connect the negative battery cable.
Air Conditioning (A/C) Relay
Removal Procedure
1. Remove the fuse and relay box cover from under the
hood.
2. Consult the diagram on the cover to determine which
is the correct relay.
3. Pull the relay straight up and out of the fuse and relay
box.
Installation Procedure
1. Insert the relay into the correct place in the fuse and
relay box with the catch slot facing forward.
2. Press down until the catch engages.

An audible ªclickº will be heard.
3. Install the fuse and relay box cover.
Exhaust Gas Recirculation
(EGR) Vacuum Switch Valve
(VSV)
Removal Procedure
1. Disconnect the negative battery cable.

6E±218
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
2. Disconnect the EGR VSV connector and vacuum
hose from the EGR VSV.
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3. Remove the MAP sensor assembly and EGR VSV.
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4. Remove the EGR VSV from the MAP sensor bracket.
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Installation Procedure
1. Install the EGR VSV and tighten nut to specified
torque.
Torque: 8 N´m (69 lb in)
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6E±219 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
2. Install the MAP sensor assembly and EGR VSV and
tighten MAP sensor bracket fixing bolts specified
torque.
Torque: 9 N´m (78 lb in)
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3. Connect the EGR VSV connector and vacuum hose
in the EGR VSV.
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4. Connect the negative battery cable.
Electronic Vacuum Regurating
Valve (EVRV)
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the EVRV hose and the EVRV connector.
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3. Remove the EVRV.
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6E±220
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Installation Procedure
1. Install the EVRV.
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2. Connect the EVRV hose and the EVRV connector.
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3. Connect the negative battery cable.
Wiring and Connectors
Wiring Harness Service
The ECM harness electrically connects the ECM to the
various solenoids, switches and sensors in the vehicle
engine compartment and passenger compartment.
Replace wire harnesses with the proper part number
replacement.
Because of the low amperage and voltage levels utilized
in powertrain control systems, it is essential that all wiring
in environmentally exposed areas be repaired with crimp
and seal splice sleeves.The following wire harness repair information is intended
as a general guideline only. Refer to
Chassis Electrical for
all wire harness repair procedures.
Connectors and Terminals
Use care when probing a connector and when replacing
terminals. It is possible to short between opposite
terminals. Damage to components could result. Always
use jumper wires between connectors for circuit
checking. NEVER probe through Weather-Pack seals.
Use an appropriate connector test adapter kit which
contains an assortment of flexible connectors used to
probe terminals during diagnosis. Use an appropriate
fuse remover and test tool for removing a fuse and to
adapt the fuse holder to a meter for diagnosis.
Open circuits are often difficult to locate by sight because
oxidation or terminal misalignment are hidden by the
connectors. Merely wiggling a connector on a sensor, or
in the wiring harness, may temporarily correct the open
circuit. Intermittent problems may also be caused by
oxidized or loose connections.
Be certain of the type of connector/terminal before
making any connector or terminal repair. Weather-Pack
and Com-Pack III terminals look similar, but are serviced
differently.
Wire Harness Repair: Twisted
Shielded Cable
Removal Procedure
1. Remove the outer jacket.
2. Unwrap the aluminum/mylar tape. Do not remove the
mylar.
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6E±221 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
3. Untwist the conductors.
4. Strip the insulation as necessary.
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Installation Procedure
1. Splice the wires using splice clips and rosin core
solder.
2. Wrap each splice to insulate.
3. Wrap the splice with mylar and with the drain
(uninsulated) wire.
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4. Tape over the whole bundle to secure.
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Twisted Leads
Removal Procedure
1. Locate the damaged wire.
2. Remove the insulation as required.
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6E±223 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Weather-Pack Connector
Tools Required
5-8840-0388-0 Weather-Pack II Terminal Remover
Removal Procedure
A Weather-Pack connector can be identified by a rubber
seal at the rear of the connector. This engine room
connector protects against moisture and dirt, which could
from oxidation and deposits on the terminals. This
protection is important, because of the low voltage and
the low amperage found in the electronic systems.
1. Open the secondary lock hinge on the connector.
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2. Use tool 5-8840-0388-0 or the equivalent to remove
the pin and the sleeve terminals. Push on
5-8840-0388-0 to release.
NOTE: Do the use an ordinary pick or the terminal may
be bent or deformed. Unlike standard blade terminals,
these terminals cannot be straightened after they have
been improperly bent.
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3. Cut the wire immediately behind the cable seal.
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Installation Procedure
Make certain the connectors are properly seated and all
of the sealing rings are in place when you reconnect the
leads. The secondary lock hinge provides a backup
locking feature for the connector. The secondary lock
hinge is used for added reliability. This flap should retain
the terminals even if the small terminal lock tangs are not
positioned properly.
Do not replace the Weather-Pack connections with
standard connections. Read the instructions provided
with the Weather-Pack connector and terminal packages.
1. Replace the terminal.
2. Slip the new seal onto the wire.
3. Strip 5 mm (0.2º) of insulation from the wire.
4. Crimp the terminal over the wire and the seal.
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6E±224
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
5. Push the terminal and the connector to engage the
locking tangs.
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6. Close the secondary locking hinge.
Com-Pack III
General Information
The Com-Pack III terminal looks similar to some
Weather-Pack terminals. This terminal is not sealed and
is used where resistance to the environment is not
required. Use the standard method when repairing a
terminal. Do not use the Weather-Pack terminal tool
5-8840-0388-0 or equivalent. These will damage the
terminals.
Metri-Pack
Tools Required
5-8840-0632-0 Terminal Remover
Removal Procedure
Some connectors use terminals called Metri-Pack Series
150. These may be used at the engine coolant
temperature (ECT) sensor.
1. Slide the seal (1) back on the wire.2. Insert the 5-8840-0632-0 tool or equivalent (3) in
order to release the terminal locking tang (2).
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3. Push the wire and the terminal out through the
connector. If you reuse the terminal, reshape the
locking tang.
Installation Procedure
Metri-Pack terminals are also referred to as ªpull-to-seatº
terminals.
1. In order to install a terminal on a wire, the wire must be
inserted through the seal (2) and through the
connector (3).
2. The terminal (1) is then crimped onto the wire.
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3. Then the terminal is pulled back into the connector to
seat it in place.