Isuzu Trooper (1998-2002 year). Manual - part 640

6E–208

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Installation Procedure

1. Install the ECM.

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2. Install the bolts, ECM bracket and battery bracket.

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3. Connect the ECM connector.

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4. Connect the negative battery cable.

If the ECM is replaced, the new ECM will need to be
programmed.

EEPROM

General Description

The Electronically Erasable Programmable Read Only
Memory (EEPROM) is a permanent memory that is
physically soldered within the ECM.  The EEPROM
contains program and calibration information that the
ECM needs to control powertrain operation.

Functional Check

1. Perform the On-Board Diagnostic System Check.
2. Start the engine and run for one minute.
3. Scan for DTCs using the Tech 2.

Intake Throttle Position (ITP)

Sensor

Removal Procedure

1. Disconnect the negative battery cable.

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

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.
5. Remove the throttle body from the intake manifold.
6. Disconnect the ITP sensor electrical connector and

throttle motor control connector.

7. Remove the bolts and the ITP sensor from the throttle

body.

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NOTE: Do not clean the ITP sensor by soaking it in
solvent.  The sensor will be damaged as a result.

Function Check

Use a Tech 2 to check the ITP sensor output voltage at
closed throttle.

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The voltage should be under 0.85 volt.

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If the reading is greater than 0.85 volt, check the
throttle shaft to see if it is binding.

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If the throttle shaft is not binding and the throttle cable
is properly adjusted, install a new ITP sensor.

Installation Procedure

1. Install the ITP sensor on the throttle body with the

bolts.

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2. Install the throttle body 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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3. Connect the ITP sensor electrical connector and

throttle motor control connector.

4. Install the bracket to the intercooler.
5. Install the cover of intercooler.
6. Install the negative battery cable.

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Vehicle Speed Sensor (VSS)

Removal Procedure

CAUTION: The VSS is located on the right side of
the transfer case just ahead of the rear propeller
shaft and very close to the exhaust pipes.  Be sure
that the exhaust pipes are cool enough to touch
before trying to remove the VSS.  If the pipes are hot,
you could be burned.

1. Disconnect the negative battery cable.
2. Disconnect the VSS electrical connector.

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3. Remove the bolt and the clamp securing the VSS in

place.

IMPORTANT:

Have a container ready to catch any fluid

that leaks out when the VSS is removed from the transfer
case.

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4. Remove the VSS from the transfer case by wiggling it

slightly and pulling it straight out.

Inspection Procedure

1. Inspect the electrical connector for signs of corrosion

or warping.  Replace the VSS if the electrical
connector is corroded or warped.

2. Inspect the VSS driven gear for chips, breaks, or worn

condition.  Replace the VSS if the driven gear is
chipped, broken or worn.

3. Inspect the O-ring for wear, nicks, tears, or

looseness.  Replace the O-ring if necessary.

Installation Procedure

1. Install the VSS in the transfer case with the notch for

the connector facing the rear.

2. Secure the VSS in place with the clamp and the bolt.

Tighten

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Tighten the bolt to 16 N·m (12 lb ft.).

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3. Connect the VSS electrical connector.

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4. Check the transfer case oil level.  Add fluid if

necessary.

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

5. Connect the negative battery cable.

Air Cleaner/Air Filter

Removal Procedure

1. Loosen the clamp between the air cleaner lid and the

duct.

2. Release the four latches securing the lid to the air

cleaner housing.

3. Remove the air cleaner lid.
4. Remove the air filter element.

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5. Remove the retaining bolts and the air cleaner

housing from the vehicle.

Installation Procedure

1. Install the air cleaner housing in the vehicle with the

retaining bolts.

2. Install the air filter element in the air cleaner housing.

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3. Install the air cleaner lid on the air duct and the air

cleaner housing.

4. Tighten the clamp and secure the four latches

between the lid and the air cleaner housing.

Accel Position (AP) Sensor

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the electrical connector to the AP sensor.
3. Remove the bolts and the accelerator pedal

assembly from the bulkhead.

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4. Remove the bolts and AP sensor from the accelerator

pedal assembly.

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