1997 ISUZU TFR SERIES Workshop Manual

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CONTENTS
Page
Isuzu TFR/S Immobilizer System lntroduction........................................................................ 3
What your organization should provide for your customer .............................................. 3
System outline ........................................................................................................................... 4
While the system is On.........................................................................................................4
What happens without proper transponder operation? .................................................... 4
No proper transponder is available, what should be done for the system? ................... 4
Caution to the operation......................................................................................................4
Summary of operation ..........................................................................................................4
Illustration of lnstrument panel ........................................................................................... 5
Immobilizer system Gas Engine (6VD1 3.2L/C22NE 2.2L/22LE 2.2L/2.0LE 2.0L) ................. 6
Immobilizer system Diesel Engine (4JG2 3.1L/4JB1 2.8L/4JA1 2.5L) ................................... 7
Electrical Equipment Instruments ........................................................................................... 8
Location of Components...................................................................................................... 8
Electrical Equipment – Instruments ........................................................................................ 9
Terminal Assignment of wiring Harness Connector, Immobilizer Controller ................. 9
Electrical Equipment – Instruments ...................................................................................... 10
Function (Continued)..........................................................................................................10
Car Pass Card..................................................<0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
11001100110011001100110011001100110011001100110011>10
Checking Component Required ........................................................................................ 11
Tech 2 illustration ............................................
................................................................... 11
Important information on Programming................................................................................ 12
Security code ...................................................................................................................... 12
1. Entering a code .............................................................................................................. 12
2. Getting started ............................................................................................................... 13
3. Transponder ................................................................................................................... 14
Transponder program .................................................................................................... 14
Erase transponder key................................................................................................... 15
4. Reset Immobilizer ICU (Immobilizer Control Unit) (Gas Engine Model).................... 16
5. Programming ICU, ECM ................................................................................................ 17
Important ............................................................................................................................. 23

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Page
Loss of car pass ...............................................<0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
11001100110011001100110011001100110011001100110011>... 24
Diagnostic procedure.............................................................................................................. 26
Diagnostic procedure.............................................................................................................. 27
1. 12V power is not supplied to lCU. ................................................................................ 27
2. Engine does not start after steering assembly is repaired. ....................................... 27
3. If engine does not start after ICU replacement, check part number (01MY)............. 27
4. Electrical wiring ............................................................................................................. 32

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Isuzu TFR/S Immobilizer System Introduction
This manual is an introduction of immobilizer system for service readiness view.
An electrical immobilizer is available as of Model Year 2001 TFR/S to prevent unauthorized persons from starting
the engine. To support customers, there are some important items your organization needs to provide. If fails, your
organization and lsuzu Motors may face severe customer complains.
What your organization should provide for your customer
Car Pass
For a new owner, your dealership must hand Car Pass card, which has identification numbers of new owner's
vehicle immobilizer system. This information is very important in case of repair or lost of transponder.
The followings are necessary items provided by your responsibility.
1) Car Pass with identification for a new owner
2) Blank Car Pass Card when it is for reissue
3) Instruction to dealers how to use Car Pass Card
Security code management
Your organization must keep security codes for all vehicles as confidential data. Once the security codes are
lost, anybody who have the security code can access the immobilizer system. Your organization has
responsibility of any missing vehicles caused by stolen security code.
Customer support
Lost Car Pass may happen when customer needs security code. Your organization sets up release security
code process with verification procedure.
Sometimes customer needs security code in urgent manner. Therefore Isuzu recommends your organization
organizes 24 hours support.
Essential tool
Your dealership must have Tech 2, and Tech 2 updated software for immobilizer system.
Dealer training
Dealer technician must be trained how to diagnose, program, reprogram the immobilizer system. Even though
no problem happens, customer may request additional transponders when releases new vehicle to customer, or
even afterward.
Before sales start, dealer training must be done.

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System outline
The immobilizer system consists of the four major components, which are DDS-1, Engine Control Module (ECM),
Immobilizer Control Unit (lCU), and transponder.
See page 6 for Gas engine, page 7 for Diesel Engine.
This system can be activated by a correctly programmed transponder and starter switch is set to OFF. This system
can be deactivated by a correctly programmed Transponder Key connected with a correctly programmed ECM and
a correctly programmed immobilizer lCU.
While the system is On
ln case of Gas engine;
The starter cut off relay deactivates function of starter, and the fuel injector power source is deactivated also.
ln case of Diesel engine;
The starter cut off relay deactivates function of starter, and the pump is deactivated also.
What happens without proper transponder operation?
One of the function of transponder is to deactivate or activate starter function. lf the proper transponder is not used,
starter cannot be operated. Because starter cut off relay stays On, cranking engine is not possible.
After the starter cut off relay is deactivated, transponder signal triggers to let immobilizer lCU calculate by
transponder address signal and immobilizer algorithm.
When the result matches with necessary condition, it makes injector power source be activated.
If transponder does not send correct signal, immobilizer lCU and ECM do not activate injector system On. Therefore
the vehicle cannot be operated.
No proper transponder is available, what should be done for the system?
When any proper transponder is not available, a new transponder should be programmed. Up to 5 transponders
can be provided with Tech 2 and by proper procedure. See pages 14-15.
In addition to the absence of proper transponder, it may happen particular secret code to the particular vehicle is
missing. ln this case, the secret code must be provided by your organization (refer to “loss of car pass” on pages
24, 25). Otherwise transponder cannot be programmed in any way.
lf the essential tool Tech 2 for programming and proper software for Tech 2 are not available, there is no permanent
way to fix system. Temporary replace with new ECM, new ECU and new transponder without any secret code can
make the system be deactivated, but it does not last long. Such a replacement does not solve any condition. Even
after replacement, the system is activated automatically in short time and then no operation of the vehicle can be
made in any way.
Tech 2 should be provided in your organization. See page 12.
Caution to the operation
lf an attempt is made to start the engine while the immobilizer system is activated, the CHECK ENGINE indicator
flashes and the engine will not start. See the illustration at the bottom of this page.
Summary of operation
Switch On: Set the ignition and starter switch to OFF.
(Activate)
Switch Off: Set the ignition and starter switch to ON by using the transponder key.
(Deactivate)

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Illustration of Instrument panel

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Immobilizer system Gas Engine
(6VD1 3.2L/C22NE 2.2L/22LE 2.2L/20LE 2.0L)

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Immobilizer system Diesel Engine
(4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)

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Electrical Equipment – Instruments
Location of Components
12
3
1 Control unit; electronic immobilizer
(located at the under cross Beam)
2 Antenna coil
3DLC