engine ISUZU TFR SERIES 1997 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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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
Terminal Assignment of wiring Harness Connector, Immobilizer Controller
1 Back up voltage supply
2 Voltage from ignition switch ON
3 Communication: carry on line from ECM
to immobilizer (Gas Engine)
Check Engine Lamp (Diesel Engine)
4 DWA (South Africa model only)
5N.C.
6 Antenna coil positive
7 Ground8 Communication: carry on line from
immobilizer to ECM (Gas Engine)
Communication: carry on line from
immobilizer to DDS-1 (Diesel Engine)
9To Tech 2
10 Speed sensor voltage (Gas Engine)
11 N.C.
12 N.C.
13 Antenna coil negative
14 Starter relay

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Electrical Equipment – Instruments
Function (Continued)
Car pass Card
Each vehicle has a car pass, which is issued to the customer on delivery of the vehicle along with the other papers.
For this, a card is used, similar to the conventional radio passes.
Note:
This car pass is an important document and must be treated with the same care as the vehicle papers. It
must not be kept in the vehicle. The customer must present the car pass for operations involving the
immobilizer or the engine control unit.

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lmportant information on Programming
Security code
If the immobilizer and engine control unit are replaced at the same time, the immobilizer control unit must be
programmed first before the “IMMOBILIZER” function in the engine control unit can be activated.
The security code protects the immobilizer control unit against unauthorized programming and data access from
Tech 2. The security code consists of a 4 digit code number and is programmed into the immobilizer control unit
and ECM (Engine Control Module; Gas Engine only).
New control units are not programmed with a security code. If the control units are replaced, the security code
entered in the car pass, transponder lD, etc. must be programmed into the new control unit with Tech 2.
The security code can only be programmed with Tech 2 once and must therefore be performed with great care.
Once programmed, the security code cannot be overwritten.
An already used immobilizer can be reused in a different car by initializing the immobilizer.
After that you can program the security code again. For initializing command you need the current security code.
If the immobilizer control unit is returned (e.g. warranty cases), always enclose the security code that is allocated to
that control unit. If this is not done, we can not process the case and the warranty will not be recognized.
1. Entering a code
If the Tech 2 display requests the
security code
mechanical key number
Vehicle Identification No.
to be entered, process as follows;
To input a digit you need to use the up and down buttons of the Tech 2. By using the numeric buttons, the
according digit will be displayed at the current position and the cursor will move to the next position.
For letters you need to use the up and down buttons of the Tech 2. The up and down key might be used for
digits as well. By using the up and down buttons, the displayed digit or letter will be increased or decreased. To
move to the next position you need to use the move-to-right-button.
With the two buttons, move-to-right and move-to-left you can select the position of number you want to change.
This will allow you to correct a wrong number.
After the number is completed you need to press the Enter button to accept the number.
Correction is now no longer possible.
Use the OKAY soft key to program the number and the NOT OKAY soft key to abort the programming.

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4. Reset Immobilizer ICU (Immobilizer Control Unit) (Gas Engine Model)
CAUTION:
Do not reset immobilizer ICU for diesel engine models.
1. Select “Body” and “Immobilizer”.
2. Select “Additional Function” and “Reset Immobilizer”.
3. Enter the security code and press Confirm.
4. Reset Immobilizer screen shows up with warning. See the following screen.
Do this only before replace the immobilizer ECU
ConfirmReset Immobilizer
Warning: Engine will not start after reset!
5. When reset is completed, the following screen shows up.
Program completed
Confirm