Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 268

Immobilizer System Introduction 

 

This manual is an introduction of immobilizer system for service readiness view. 

 

An electrical immobilizer is available as of Model Year 2002 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 

 

 
l 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 

l 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 immobilizer system. Your organization has responsibility of any missing vehicles 

caused by stolen security code. 

l 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. 

l Essential tool Your dealership must have Tech-2, and Tech-2 updated software for 

immobilizer system. 

l Dealer training Dealer technician must be trained how to diagnose, program, reprogram 

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. 

 

System description 

 

The immobilizer system consists of the four major components. which are Engine Control 

Module (ECM), Immobilizer Control Unit (lCU), transponder, DDS-1 and scan tool (Tech-2). 

See page 4 for Gasoline engine, page 5 for Mechanical Control Diesel Engine, page 6 for   

Electrical Control 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 lCU. 

 

While the system is on 

ln case of Gasoline engine and Electrical Control Diesel engine; 

The starter cut off relay deactivates function of starter, and the fuel injector power source is 

deactivated also. 

ln case of Mechanical Control 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 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, 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 12 to13. 

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 23,24). 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 ECM 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. Refer to page 10

. 

Caution to the operation 

lf an attempt is made to start the engine while the immobilizer system is activated, the CHECK 

ENGINE Lamp 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) 

 

Illustration of Instrument panel 
 

 

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