Isuzu Trooper (1998-2002 year). Manual - part 639

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Installation Procedure

1. Install the IAT sensor into the grommet in the intake

air duct.

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2. Correct the IAT electrical connector.
3. Connect the negative battery cable.

Manifold Absolute Pressure

(MAP) Sensor

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the EGR valve.

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3. Disconnect the MAP sensor connector from the MAP

sensor.

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4. Remove the bolts and the MAP sensor from the

intake manifold.

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Installation Procedure

1. Install the MAP sensor and bolts on the intake

manifold.

Torque: 4 N·m (35 lb in)

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2. Connect the MAP sensor connector.

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3. Connect the EGR valve.

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4. Connect the negative battery cable.

Oil Temperature (OT) Sensor

Removal Procedure

1. Disconnect the negative battery cable.
2. Remove the battery.

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

3. Disconnect the electrical connector from the OT

sensor.

4. Remove the OT sensor.

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Installation Procedure

1. Install the OT sensor.

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2. Connect the OT sensor electrical connector.
3. Install the battery.

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4. Connect the negative battery cable.

Malfunction Indicator Lamp

(MIL)

Removal and Installation Procedure

Refer to Meter in Electrical section.

Engine Control Module (ECM)

Service Precaution

NOTE: To prevent possible electrostatic discharge
damage to the ECM, do not touch the connector pins or
soldered components on the circuit board.

When replacing the ECM to prevent possible electro
damage, follow these guidelines:
Before removing the ECM, disconnect the negative
battery cable.
Before install the ECM, install the negative battery cable.

Electrostatic Discharge (ESD)
Damage

Electronic components used in the control systems are
often designed to carry very low voltage.  Electronic
components are susceptible to damage caused by
electrostatic discharge.  Less than 100 volts of static
electricity can cause damage to some electronic
components.  By comparison, it takes as much as 4,000
volts for a person to even feel the zap of a static
discharge.
There are several ways for a person to become statically
charged.  The most common methods of charging are by
friction and by induction.  An example of charging by
friction is a person sliding across a car seat.
Charging by induction occurs when a person with well
insulated shoes stands near a highly charged object and
momentarily touches ground.  Charges of the same
polarity are drained off leaving the person highly charged
with the opposite polarity.  Static charges can cause

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4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

damage, therefore, it is important to use care when
handling and testing electronic components.

NOTE: To prevent possible Electrostatic Discharge
damage, follow these guidelines:

D

Do not touch the control module connector pins or
soldered components on the control module circuit
board.

D

Do not open the replacement part package until the
part is ready to be installed.

D

Before removing the part from the package, ground
the package to a known good ground on the vehicle.

D

If the part has been handled while sliding across the
seat, or while sitting down from a standing position, or
while walking a distance, touch a known good ground
before installing the part.

NOTE: To prevent internal ECM damage, the ignition
must be in the “OFF” position in order to disconnect or
reconnect power to the ECM (for example: battery cable,
ECM pigtail, ECM fuse, jumper cables, etc.).

IMPORTANT:

When replacing the production ECM

with a service ECM, it is important to transfer the
broadcast code and production ECM number to the
service ECM label.  This will allow positive identification of
ECM parts throughout the service life of the vehicle.  Do
not record this information on the metal ECM cover.

IMPORTANT:

The ignition should always be in the

“OFF” position in order to install or remove the ECM
connectors.

Service of the ECM should normally consist of either re-
placement of the ECM.  If the diagnostic procedures call
for the ECM to be replaced, the ECM should be checked
first to ensure it is the correct part.  If it is, remove the
faulty ECM and install the new service ECM.
DTC P0601 indicates the check sum error.

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the ECM connector.

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3. Remove the bolts ECM bracket and battery bracket.

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4. Remove the ECM.

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