1998 ISUZU TROOPER Service Repair Manual

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Page 1921 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±28
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
in the ECMs memory, the DTC(s) will be output from the
lowest to the highest, with each DTC being displayed
three times.
The DTC display will continu

Page 1922 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±29 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Tech 2 Scan Tool
From 98 MY, Isuzu dealer service departments are
recommended to use Tech 2. Please refer to Tech 2 user
guide.
901RW257
Legend
(1) PC

Page 1923 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±30
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Getting Started
Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. The Isuzu 98 System PCMCIA card (1)

Page 1924 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±31 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
060RW120
Menu
The following table shows, which functions are used
the available equipment versions.
F0: Diagnostic Trouble Codes
F0: Read DTC Info Or

Page 1925 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±32
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC Modes
There are three options available in the Tech 2 DTC mode
to display the enhanced information available. A
description of the new modes, DTC

6E±32
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC Modes
There are three options available in the Tech 2 DTC mode
to display the enhanced information available. A
description of the new modes, DTC Info, follows. After
selecting DTC, the following menu appears:
DTC Info
Clear Info
Read DTC Info Ordered By Priority
The following is a brief description of each of the sub
menus in DTC Info. The order in which they appear here is
alphabetical and not necessarily the way they will appear
on the Tech 2.
DTC Information Mode
Use the DTC info mode to search for a specific type of
stored DTC information.The service manual may instruct
the technician to test for DTCs in a certain manner.
Always follow published service procedures.
Fail This Ignition
This selection will display all DTCs that have failed during
the present ignition cycle.
History
This selection will display only DTCs that are stored in the
ECM's history memory. It will not display Type B DTCs
that have not requested the MIL (ªCheck Engineº lamp). It
will display all type A and B DTCs that have requested the
MIL and have failed within the last 40 warm-up cycles. In
addition, it will display all type C and type D DTCs that
have failed within the last 40 warm-up cycles.
MIL SVC or Message Requested
This selection will display only DTCs that are requesting
the MIL. Type C and type D DTCs cannot be displayed
using this option. This selection will report type B DTCs
only after the MIL has been requested.
Test Failed Since Code Cleared
This selection will display all active and history DTCs that
have reported a test failure since the last time DTCs were
cleared.
Injector Test
This test is conducted to make it sure that appropriate
electric signals are being sent to injectors Nos. 1 ± 4.
Tech±2 must be used for this test.
Test Procedure:
1. Connect Tech±2 to the vehicle DLC.
2. Set Ignition Switch to the ªONº position.
3. Select Control Test.
4. Select Injector Test.
5. Send instructions to each injector(Switch on), making
sure of injector working noise.
NOTE: If injector working noise (Clink) can hardly be
confirmed, remove the engine head cover noise
insulation.
Refer to Section 6A.6. In the injector whose working noise has been
confirmed, its electric circuit can be regarded as
normal.
As for the injector whose working noise has not been
confirmed, its electric circuit or the injector proper is
faulty.
EGR Valve Test
This test is conducted to check EGR valve for its working.
This test needs Tech±2.
Test Procedure
1. Connect Tech±2 to vehicle DLC.
2. Switch on the engine.
3. Select ªDIAGNOSISº from the main menu.
4. Select Miscellaneous Test.
5. Select EGR Valve.
6. Instruct EGR Valve to check a data list.
7. If change in the data list shows a normal valve, the
working of EGR Valve can be judged to be normal.
Rail Pressure Control Valve Test
This test is conducted to check RPC valve for its working.
This test needs Tech±2.
Test Procedure
1. Connect Tech±2 to vehicle DLC.
2. Switch on the engine.
3. Select ªDIAGNOSISº from the main menu.
4. Select Miscellaneous Test.
5. Select Rail Pressure Control Valve.
6. Instruct RPC Valve to check a data list.
7. If change in the data list shows a normal valve, the
working of RPC Valve can be judged to be normal.
Injector Balance Test
This test is conducted to make it sure that appropriate
electric signals are being sent to injectors Nos. 1-4, when
the engine is idling.
This test needs Tech±2.
Test Procedure
1. Connect Tech±2 to vehicle DLC.
2. The engine is running at idling condition.
3. Select ªDIAGNOSISº from the main menu.
4. Select Miscellaneous Test.
5. Select the injector Balance Test.
6. Send instructions to each injector(Switch On),
making sure change of the engine vibration.
7. In the injector whose change of the vibration has been
confirmed, it's electric circuit can be regarded as
normal.
Data Programming in Case of ECM Change
When replacing ECM, it is necessary to confirm and
record the group sign of injector beforehand. For this
confirmation.

Page 1926 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±33 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Tech±2 must be used. After ECM change, the recorded
group sign should be programmed. Oil pressure sensor
data also should be programmed.
Group Sign

Page 1927 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±34
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Fuel Injection System
060RW178
Legend
(1) ECM
(2) Meter Panel
(3) Battery
(4) Oil Temp Sensor
(5) Rail Pressure Sensor
(6) Glow Relay
(7) Oil Rail
(8)

Page 1928 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±35 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Guid to the System
Fuel Injection system is an HEUI (Hydraulically
Actuated, Electronically Controlled, Unit, Injector)
type. In this type of injecto

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