ISUZU KB P190 2007 Workshop Repair Manual

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 correctl
y
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.
• W arning buzzer is operating.
(W ith antitheft system)
•
••
•
Gasoline Engine (C24SE)
LTW 3BALF000101


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11A-4 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
Diesel Engine With Engine Immobilizer Unit (4JA1-T Mechanical Control Engine)







RAW 4B0LF000101



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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 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.
W hen 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?
W hen 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.



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ISUZU KB P190 2007

11A-6 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
Circuit Diagram
•
••
•
Gasoline Engine (C24SE)





RTW 7BALF000101


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IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-7
Diesel Engine With Engine Immobilizer Unit (4JA1-T Mechanical Control Engine)






RAW 4B0LF000401



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11A-8 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
Parts Location
LTW 3BAMF000101

Legend
(1) Immobilizer Coil
(2) Immobilizer Control Unit (ICU)


(3) Cross Beam
(4) Steering Shaft



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IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-9
Immobilizer control unit (ICU); For
Electronic Control Engine (C24SE)
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. W hen the
code registered into the key is unusual, and when not
recognizing a security code, ICU does not permit
starting of engine.


RUW 38HSF000101


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11A-10 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
Pin-outs; For Electronic Control Engine (C24SE)
RUW 38HSF000201


No. Pin Function
A-1 Antenna coil positive
A-2

A-3 Antenna coil negative
B-1 Starter Relay
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
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)


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IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-11
Immobilizer control unit (ICU);
Mechanical Control Engine (4JA1-T)
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 immobilizer unit (DDS-1)
is compared and it is judged that it is normal. W hen the
code registered into the key is unusual, and when not
recognizing a security code, engine immobilizer unit
does not permit starting of engine by the fuel cut valve
on the fuel pump.
The engine immobilizer unit is located with fuel cut
valve on fuel pump 4JA1-T engine.
The immobilizer control unit decides whether there is an
abnormality the security code based on the engine
immobilizer unit security code.
W hen the problem found, the engine immobilizer unit
stops fuel supply by the fuel cut valve.






RAW 4B0SF000101

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11A-12 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
Pin-outs





RUW 48HSF000201


No. Pin Function
1 Back up voltage supply
2 Voltage from ignition switch ON
3 Lamp
4

5

6 Antenna coil positive
7 Ground
8 Engine immobilizer unit
9 To Tech2
10

11 
12

13 Antenna coil negative
14 Starter cut relay



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