WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE
SRS COMPONENTS OR THE SRS WIRING, REFER
TO THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN
POSSIBLE AIR BAG DEPLOYMENT, PERSONAL
INJURY, OR OTHERWISE UNNEEDED SRS SYSTEM
REPAIRS.

CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or
other corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener.
When you install fasteners, use the correct
tightening sequence and specifications. Following
these instructions can help you avoid damage to
parts and systems.

IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-3

General Description

The immobilizer system consists of the four major
components which are Engine Control Module (ECM),
Immobilizer Control Unit (lCU), transponder, and scan
tool (Tech-2).

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 :

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

• Check Engine lamp is flashing.
• Warning buzzer is operating.

(With antitheft system)

•••• Gasoline Engine (C24SE)

LTW3BALF000101

11A-4 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)

Diesel Engine With Engine Immobilizer Unit (4JA1-T Mechanical Control Engine)

RAW4B0LF000101

IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-5

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 relay
stays off, cranking engine is not possible.

After the starter relay is activated, 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 a scan tool (Tech-2)
and by proper procedure.

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.

Otherwise transponder cannot be programmed in any
way.

lf the essential for a scan 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 ICU 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.

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.

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)

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 immobilizer system. Your organization has
responsibility of any missing vehicles caused by stolen
security code.

•••• Essential tool (Scan tool : Tech-2)
Your dealership must have Tech-2, and Tech-2 updated
software for immobilizer system.

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