2004 ISUZU TF SERIES immobilizer

IMMOBILIZER SYSTEM 11A-5

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






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11A-6 IMMOBILIZER SYSTEM

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 rela
y
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 ma
y
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 an
y
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 b
y
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 ver
y
important in case of repair or lost of transponder.
The followings are necessary items provided by you
r
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.

IMMOBILIZER SYSTEM 11A-7

Circuit Diagram





Gasoline Engine (6VE1, C24SE)




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11A-8 IMMOBILIZER SYSTEM

Diesel Engine With ECM (4JH1-TC/4JA1-TC)


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IMMOBILIZER SYSTEM 11A-9

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






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11A-10 IMMOBILIZER SYSTEM

Parts Location
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Legend

(1)
Immobilizer Control Unit (ICU)

(2)
Immobilizer Coil



(3)
Cross Beam

(4)
Steering Shaft

IMMOBILIZER SYSTEM 11A-11

Immobilizer control unit (ICU); For
Electronic Control Engine (6VE1,
C24SE, 4JH1-TC, 4JA1-TC)
Immobilizer control unit (ICU) permits engine starting,
when the security code which compares the securit
y
code registered into the transponder (key) and the
security code registered into ICU, and is similarl
y
registered into ICU and engine control unit (ECM) is
compared and it is judged that it is normal. When the
code registered into the key is unusual, and when not
recognizing a security code, ICU does not permit
starting of engine.


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11A-12 IMMOBILIZER SYSTEM

Pin-outs; For Electronic Control Engine (6VE1, C24SE, 4JH1-TC, 4JA1-TC)
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No. Pin Function
A-1 Antenna coil positive
A-2


A-3 Antenna coil negative
B-1 Starter Relay (6VE1, C24SE Engine) / Immobilizer Relay (4JH1-TC/4JA1-TC Engine)
B-2 Ground
B-3 Voltage from ignition switch ON
B-4 Back up voltage supply
B-5 To Tech-2
B-6 Vehicle speed sensor (6VE1, C24SE Engine) / Not used (4JH1-TC/4JA1-TC Engine)
B-7 Communication: carry on line from ECM to ICU (Check engine lamp)
B-8 Communication: carry on line from ICU to ECM (Communication line W)