WORKSHOP MANUAL

TF-SERIES

Isuzu TFR/S Immobilizer

System
Service management procedure
and workshop manual

No.TF IMM-WE-0121 PRINTED IN JAPAN

 NOTICE

Before using this Workshop Manual to assist you in performing

vehicle service and maintenance operations, it is recommended
that you carefully read and thoroughly understand the
information contained in Section 0A under the headings
“GENERAL REPAIR INSTRUCTIONS” and “HOW TO USE THIS
MANUAL”.

All material contained in this Manual is based on the latest

product information available at the time of publication.
All rights are reserved to make changes at any time without
prior notice.
 CONTENTS

Immobilizer System lntroduction

What your organization should provide for your customer

System Description
While the System is on
What happens without proper transponder operation?
No proper transponder is available, what should be done for the system?
Caution to the operation
Summary of operation
Illustration of lnstrument panel

Immobilizer System for Gasoline Engine (6VD1 3.2L/C22NE 2.2L/22LE 2.2L/2.0LE 2.0L)
Immobilizer System for Mechanical Control Diesel Engine (4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)
Immobilizer System for Electrical Control Diesel Engine (4JA1-TC 2.5L/4JH1-TC 3.0L)

Electrical Equipment Instruments

Location of Components

Electrical Equipment Instruments

Immobilizer Control Unit (ICU) : Connector Pin Assignment
6VD1 3.2L/C22NE 2.2L/22LE 2.2L/20LE 2.0L/4JG2 3.1L/4JB1 2.8L/4JA1 2.5L
4JA1-TC 2.5L/4JH1-TC 3.0L

Car Pass Card

Checking Component Required

Tech-2 illustration

Important information on Programming

Security code
1. Entering a code
2. Getting started (Tech-2 Operation)
3. Transponder
Transponder program
Erase transponder key
4. Reset ICU (Immobilizer Control Unit )
5. Reset Function
6. Programming ICU, ECM
Important
Loss of car pass
Diagnostic procedure
(6VD1 3.2L/C22NE 2.2L/22LE 2.2L/20LE 2.0L/4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)
System guidance
Diagnostic Trouble Code (DTC) list
No DTC indicates
1.12V power is not supplied to ICU
2.Engine does not start after steering assembly is repaired
3.If engine does not start after ICU replacement, check part number (01MY)
DTC appears
B8011 TRANSPONDER KEY PROBLEM
B8012 WRONG TRANSPONDER KEY
B8013 IMMOBILIZER NOT PROGRAMED
B8014 NO TRANSPONDER KEY PROGRAMED
B8055 EEPROM ERROR
B8015 VEHICLE SPEED SIGNAL Lo (Gasoline Engine)
FREQUENCY SIGNAL Lo (Diesel Engine)
B8016 VEHICLE SPEED SIGNAL Hi (Gasoline Engine)
FREQUENCY SIGNAL Hi (Diesel Engine)
B8017 NO ENGINE REQUEST RECEIVED (Gasoline Engine)
B8023 ANTENNA COIL OPEN
B8024 WRONG TRANSPONDER RESPONSE
Diagnostic procedure (4JA1-TC 2.5L/4JH1-TC 3.0L)
System guidance
Diagnostic Trouble Code (DTC) list
No DTC indicates
1.12V power is not supplied to ICU
2.Engine does not start after steering assembly is repaired
3.If engine does not start after ICU replacement, check part number (02MY)
DTC appears
B8001 REPLACE ELECTRONIC CONTROL UNIT (ECU) (IMMOBILIZER FAULT)
B8002 IMMOBILIZER NOT PROGRAMMED
B8003 TRANSPONDER KEY PROBLEM
B8004 IMMOBILIZER COIL CIRCUIT (ANTENNA COIL FAULT)
B8005 COMMUNICATION LINE W VOLTAGE Low
B8006 COMMUNICATION LINE W VOLTAGE High
B8007 NO ENGINE REQUEST RECEIVED
B8008 WRONG TRANSPONDER KEY
B8009 NO TRANSPONDER KEY PROGRAMMED
B8010 UNKNOWN TRANSPONDER KEY

Immobilizer system electrical wiring

Gasoline Engine (6VD1 3.2L)
Gasoline Engine (C22NE 2.2L/22LE 2.2L/20LE 2.0L)
Diesel Engine (Mechanical Control , 4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)
Diesel Engine (Electrical Control , 4JA1-TC 2.5L/4JH1-TC 3.0L)
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)
Immobilizer system for Mechanical Control Diesel Engine
(4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)
Immobilizer system for Electrical Control Diesel Engine
(4JA1-TC 2.5L/4JH1-TC 3.0L)
Electrical Equipment – Instruments

Location of Components

1 Control unit; electronic immobilizer (located at the under cross Beam)

2 Antenna coil
Electrical Equipment – Instruments

Immobilizer Control Unit (ICU) : Connector Pin Assignment

(6VD1 3.2L/C22NE 2.2L/22LE 2.2L/20LE 2.0L/4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)

1 Back up Voltage supply

2 Voltage from ignition switch ON
3 Communication: carry on line from ECM to immobilizer (Gasoline Engine)
Check Engine Lamp (Diesel Engine)
4 N.C
5 N.C
6 Antenna coil positive
7 Ground
8 Communication: carry on line from immobilizer to ECM (Gasoline Engine)
Communication: carry on line from immobilizer to DDS-I (Diesel Engine)
9 To Tech-2
10 Speed sensor voltage (Gasoline Engine)
11 N.C
12 N.C
13 Antenna coil negative
14 Starter relay
Immobilizer Control Unit (ICU) : Connector Pin Assignment
(4JA1-TC 2.5L/4JH1-TC 3.0L)

B3 B2 B1

B8 B7 B6 B5 B4 A3 A2 A1

A-1 Antenna coil positive

A-2 N.C
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 N.C
B-7 Communication: carry on line from ECM to immobilizer (Check Engine Lamp)
B-8 Communication: carry on line from immobilizer to ECM
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.

Notes:

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.
Checking Component Required

Tech-2
Tech-2 software TFR/S immobilizer system
DLC kit for 16 pin diagnostic plug
Key cutter

Tech-2 illustration
lmportant information on Programming

Security code

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 Engine Control Module (ECM). (ECM : Gasoline Engine only)

New ECM is 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
ECM 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 enclosed 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 that the

l security code
l mechanical key number
l Vehicle Identification No.

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.
2. Getting started (Tech-2 Operation)

Operate Tech-2 to get the following screen as start.

l Select “Body” in System Selection Menu.

l The following table shows.

Notes:

Before going to programming process, Tech-2 indicates instruction as follows.

3. Transponder

If a transponder key is lost;

If a transponder key is lost, all transponder keys in the immobilizer control system must be
erased. Transponder keys can be ordered via the "Your proper organization name such as Parts
and accessory department" as previously by providing the mechanical key number.
The mechanical key number is provided on the car pass.
Thereafter, existing and new transponder keys are programmed consecutively using Tech-2. The
vehicle can then no longer be started using lost key.

5 transponder keys can be provided:

Each transponder has different Identifications. If a customer wants more than 2 transponder
keys, maximum 5 transponder keys can be provided by additional programming by Tech-2.

lf a new ignition key with different mechanical key number needs to be installed; If installation of
an ignition lock with a different mechanism key number is necessary (an ignition lock which
belongs to the mechanical key number has to be ordered first), all transponder keys must first be
erased and the two transponder keys which belong to the ignition lock that is now installed must
be programmed.
The new mechanical key number must be programmed now into the immobilizer. The mechanical
key number in the car pass is to be changed as well.

Transponder program

1. Connect Tech-2, select "Body" and "Immobilizer".

2. Select program Transponder (TP) - Key mode.
3. See immobilizer status on Tech-2 screen, and enter security code. If the status does not
allow the programming, only immobilizer status is displayed.
4. Insert Non-programmed Transponder-key and press soft key of "Confirm".

5. "Turn On ignition key", is displayed if the ignition is off.

6. The transponder status is displayed if the status does not allow the programming.
7. When programming starts "Programming Transponder - key!" is displayed.
8. Turn off Ignition key.
9. Turn On Ignition.
10. If the programming was not successful, the transponder status is only displayed.
11. To program more illustration press soft key

12. See programming result.

Erase transponder key

1. Select Erase Transponder (TP) - Key mode.

2. See immobilizer status on Tech-2 screen and type security code. If the status dose not
allow the programming, only immobilizer status is displayed.
3. See illustration of caution.
CAUTION Erase

    
4. See programming result on display.
4. Reset Immobilizer ICU (Immobilizer Control Unit)

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.

5. When reset is completed, the following screen shows up.

5. Reset Function

1. Select “Body” and F4 “Additional Functions”.

2. Select “Reset Engine Control Module”
3. The following screen shows up.

4. Confirm the following screen shows up.

5. Input the security code, then press the soft key of “Not Okay” or “Okay”.
6. The following screen shows up.

7. Programming is completed.
8. When the procedure is completed waits 10 seconds and then turn the Key on.
The fail lamp begins to flash.
9. Turn the ignition on, then engine dose not run.
10. Reset is completed.
6. Programming ICU, ECM

l Program ICU
1. Select “Body” and “immobilizer”.
2. See immobilizer status on the display of Tech-2.
3. Enter the security code.
4. See ECM status.
5. Input a program option, by moving the cursor on the selection, then press “Enter”.

6. Input the security code, then press the soft key of “Okay” or “Not Okay”.
7. Enter VIN.

8. Enter Mechanical key number.

9. Turn ON ignition.

10. Select an engine system.

 11. See the programming result.

Tech-2 displays the result of programming as the following.

Follow those instructions.

Selected Programming is not possible due to wrong System Status!

Immobilizer Not Programmed!
Immobilizer Already Programmed!
ECM Not Programmed!
ECM Already Programmed!

12. Transponder key must be reprogrammed, because all transponder information is erased.
when ICU is programmed. See Transponder programming.

l Program ECM
1. Procedure is the same as program ICU procedure steps 1 through 5.
6. Turn on the Ignition.
7. Select an Engine system.
8. See the display of programming result.

l Program ICU / ECM

Caution 1) Do not replace ICU and ECM at the same time
2)Change ICU at first or ECM and other one change follows.
Follow Program ICU steps 1 through 6, procedure is the same as program ECM procedure
steps 1 through 6.
7. Input the security code.
8. Enter VIN
9. Enter Key No.
10. Select an engine system.
See programming result display and follow instructions of the display.
11. Transponder key must be reprogrammed, because all transponder information on ICU is
Erased when ICU is programmed. See Transponder programming.
12. Follow program ECM steps 1 through 8.
Important

After successful programming, the engine control can only be used for vehicles with immobilizer
and transponder. Faults that occur in connection with the immobilizer control unit are recognized
by the engine control unit and as long as “IMMOBILOZER” is not programmed, are indicated by a
flashing of the engine check lamp.

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.
 Loss of car pass

If the car pass is lost, the data can be requested from your proper organization name. This
request will only be processed if accompanied by the enclosed form and proof of ownership.
Once the data is received, it can be entered in a blank car pass and given to the customer. The
unused car pass should be destroyed.

l Instructions on Filling Out the form "Data request, car pass"

To be provided by the dealership
The data requested under items 1-10 must be provided completely, including the authorized
dealership number, the vehicle Identification number(VIN) and engine type/number (Engine type/No)

Mark missing data / desired data with a cross:

19. Security code (for diagnosis and programming with Tech-2)

20. Mechanical key Number

Complete the form by entering the data and signature/authorized dealership stamp and
send it along with proof of ownership(Vehicle lD or invoice) to address provided in the
form. The requested data will be sent by Fax to the dealership that made the request
after your organization has confirmed that the info is corrected.

Important Instructions:
Only data corresponding to the delivery status of the vehicle can be issued. Car pass
data requests will only be processed if the first column is filled out completely. signed
and sent to your organization along with proof of ownership.

Information via telephone is only possible in exceptional circumstances via your service
organization.

As for the delivery of new vehicles, the customer must be informed about all features of the
car pass that are relevant to vehicle security, for example, that the car pass should be kept
in a safe place(not in the vehicle) and should be presented when an authorized your
organization name workshop is visited, The exact phrasing can be found in the relevant
Owner's Manual.
Data Request
Car Pass Your organization name

To be filled out by authorized dealership: Comment, plant security

1. Dealership name
2. Name of contact partner
3. Dealership number
4. Address

5. Tel: Fax
6. Name of registered keeper
7. Reason for request (please mark with cross)
- Loss by customer
- Loss by dealership
- New delivery Car Pass
- Theft
8. Vehicle type
9. VIN
10. Engine type / No

Requested data (please mark with cross)

11. Security Code :
12. Key No. :
13. Radio code (if lost, please supply
radio unit number)
14. CD-changer code (if lost, please
supply CD-changer unit number)

Important Instructions:
Only data corresponding to the delivery status of the vehicle Ex works can be Issued.
Car pass requests will only be processed if they are filled out completely, signed and sent to
your organization along with proof of ownership (enclosure).
Information via telephone is only possible in exceptional circumstances via your service organization.
Comments form Plant Security
No signature Data / proof of ownership incomplete,
Please complete
Data / proof of ownership missing, Illegible due to poor fax communication,
Please supply please resend
Data, signature / stamp Data, signature
(Dealership) (Plant Security)
Enclosure : Proof of ownership
Diagnostic procedure
(6VD1 3.2L/C22NE 2.2L/22LE 2.2L/20LE 2.0L/4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)

System guidance
Note:
Immobilizer may detect a history DTC by the timing of ON-OFF of a ignition switch.
Don't remove the ECM and ICU recklessly.

l Engine dose not run when any Diagnostic Trouble Code (DTC) is flagged, starting from 01MY
TFR/S.
l Once the cause of DTC is repaired or gone, engine can be operated normally, and present
DTC becomes history code.
l History code is canceled by no repeat failure on 25 consequence ignition key on afterward.
l History code cannot be canceled by battery connector disconnected, starting from 01MY.

Diagnostic Trouble Code (DTC) list

Code
Item Detecting Condition
(BCD)
B8011 TRANSPONDER Transponder code unsuccessfully read 5 consecutive time.
KEY PROBLEM (Not completely read in 500ms transponder code)
B8012 WRONG Transponder code read from the ignition key does not match the
TRANSPONDER transponder code stored in the control unit.
KEY
B8013 IMMOBILIZER NOT Immobilizer program no executed.
PROGRAMMED
B8014 NO TRANSPONDER Processing to save the transponder key in the control unit not
KEY PROGRAMMED Executed.
B8015 VEHICLE SPEED Lo level (2.5v or less) input during the Hi level was being output
SIGNAL Lo (Gasoline) In the immobilizer Signal. (Gasoline Engine)
FREQUENCY Lo level (2.5v or less) input during the Hi level was being output
SIGNAL Lo (Diesel) to the communication line. (Diesel Engine)
B8016 VEHICLE SPEED Hi level (more than 2.5v) input during the Lo level was being
SIGNAL Hi (Gasoline) output in the immobilizer Signal. (Gasoline Engine)
FREQUENCY Hi level (more than 2.5v) input during the Lo level was being
SIGNAL Hi (Diesel) output to the communication line. (Diesel Engine)
B8017 NO ENGINE No request signal received from the engine control unit in a
REQUEST second after the ignition key has been placed at ON.
RECEIVED (Gasoline engine only)
B8023 ANTENNA COIL Antenna coil not connected.
OPEN
B8024 WRONG Transponder response signal with the challenge is wrong.
TRANSPONDER
RESPONSE
B8025 WRONG ENGINE The challenge signal from the engine control unit is invalid.
REQUEST (Gasoline engine only)
B8055 EEPROM ERROR Write and read cannot be correctly made to and from the
EEPROM in the control unit.
Diagnostic procedure

No DTC indicates
Engine does not start to run even though all engine and electrical system are OK, and no DTC
appears.

1. 12V power is not supplied to ICU.

Check engine light No

ECM or electrical
Is blinking at 2Hz. unit wiring check

Yes

Starter is not rotated

Check DTC with Tech-2
By correct key at all.

Yes

12V power is not ICU power supply turns off when both +B line
supplied to ICU and ignition switch line turn off.
Repair 12V circuit

No.1 Pin
+B
ICU Check both wiring systems for continuity.
No.2 Pin
Ignition SW

2. Engine does not start after steering assembly is repaired.

Check if connector for Antenna coil circuit at steering shaft is correct, or missing connection.
If not correct, replace the steering assy with corrector.

3. If engine does not start after ICU replacement, check part number (01MY).

Proper parts Numbers are following.

Gasoline Engine 897228-184X
Suffix number
Diesel Engine 897228-183X
Suffix number
DTC appears

B8011 TRANSPONDER KEY PROBLEM

Transponder key code read error

Is key correct?

OK With other keys,

Rewrite transponder key. check for proper
operation
Please refer to “transponder programming”
on page 14. NG

OK
Rewrite all key Reregistration

NG

No
Does B0023 appear?

Yes

Check antenna wiring

NG
OK ICU replacement Correction check OK

Transponder replacement

Note : B0011 means Body category Number 0011 Diagnostic Trouble Code.
B8012 WRONG TRANSPONDER KEY

Is key correct?

OK Check other keys

Rewrite transponder key.

NG

OK Reregister
Rewrite all key transponder key

NG

ICU replacement

B8013 IMMOBILIZER NOT PROGRAMED

Replace ICU

B8014 NO TRANSPONDER KEY PROGRAMED

Replace ICU

B8055 EEPROM ERROR

Replace ICU

B8015 VEHICLE SPEED SIGNAL Lo (Gasoline Engine)

FREQUENCY SIGNAL Lo (Diesel Engine)

*Speed sensor signal voltage lower than 2.5v. (Gasoline Engine)

*Frequency signal voltage lower than 2.5v (Diesel Engine)

Check path
NG between ICU pin 8,ECM
pin for continuity

Disconnect both
connectors and check OK
path between ICU
and body earth for
continuity

Wiring repair
B8016 VEHICLE SPEED SIGNAL Hi (Gasoline Engine)
FREQUENCY SIGNAL Hi (Diesel Engine)

Disconnect both
connectors and check No
voltage on ICU side.
Clear DTC
voltage Ǩ 2.5v

Yes

Wiring repair

B8017 NO ENGINE REQUEST RECEIVED (Gasoline Engine)

Check path ICU NG

pin 3 and ECM pin B-8(V6) Wiring repair
J2-B4(L4) for continuity

OK

Replace ECM, because ECM internal circuit fails.

B8023 ANTENNA COIL OPEN

Antenna coil open

Check path between

ICU pin 6 and pin 13 Clear DTC
for continuity

NG
A connector 2 pin
NG Check path between 6
NG
Correction ICU pin 6 and connector A pin
for continuity
ICU

13
OK Antenna coil

NG Check path between

NG ICU pin 13 and connector A pin
Correction for continuity

OK

Replace steering lock Assy

Need following repair

1. Key replacement
2. Rewrite transponder
3. Replace door key cylinder

B8024 WRONG TRANSPONDER RESPONSE

Wrong Transponder code

Rewrite transponder

Reregistration

NG

ICU replacement
Diagnostic procedure
(4JA1-TC 2.5L/4JH1-TC 3.0L)

System guidance
Note:
Immobilizer may detect a history DTC by the timing of ON-OFF of a ignition switch.
Don't remove the ECM and ICU recklessly.

l Engine dose not run when any Diagnostic Trouble Code (DTC) is flagged, starting from 02MY
TFR/S.
l Once the cause of DTC is repaired or gone, engine can be operated normally, and present
DTC becomes history code.
l History code is canceled by no repeat failure on 25 consequence ignition key on afterward.
l History code cannot be canceled by battery connector disconnected, starting from 01MY.

Diagnostic Trouble Code (DTC) list

Code
No Detecting Condition
(BCD)
Replace Electronic Control Unit(ECU)
1 B8001 This error code appears if a RAM /ROM Error was detected or the EEPROM
Is defect.

2 B8002 Immobiliser Not Programmed

Transponder Key Problem

B8003 Reading of Transponder information failed with ignition on transponder has
3
a fault.
Hardware fault in reading circuit.

4 B8004 Immobiliser Coil Circuit

5 B8005 Communication Line W Voltage Low

6 B8006 Communication Line W Voltage High

7 B8007 No Engine Request Received (Check Engine Lamp disconnected?)

8 B8008 Wrong Transponder Key

9 B8009 No Transponder Key Programmed

10 B8010 Unknown Transponder Key

Diagnostic procedure

No DTC indicates
Engine does not start to run even though all engine and electrical system are OK, and no DTC
appears.

1. 12V power is not supplied to ICU.

Check engine light No

ECM or electrical
Is blinking at 2Hz. unit wiring check

Yes

Starter is not rotated

Check DTC with Tech-2
By correct key at all.

Yes

12V power is not ICU power supply turns off when both +B line
supplied to ICU and ignition switch line turn off.
Repair 12V circuit

B-4 Pin
+B
ICU Check both wiring systems for continuity.
B-3 Pin
Ignition SW

2. Engine does not start after steering assembly is repaired.

Check if connector for Antenna coil circuit at steering shaft is correct, or missing connection.
If not correct, replace the steering assy with corrector.

3. If engine does not start after ICU replacement, check part number (02MY).

Proper parts Numbers are following.

Electrical Die Engine 897234-671X

Suffix number
DTC appears

B8001 REPLACE ELECTRONIC CONTROL UNIT (ECU) (IMMOBILIZER FAULT)

Replace ICU

B8002 IMMOBILIZER NOT PROGRAMMED

Programming Immobilizer Function.

B8003 TRANSPONDER KEY PROBLEM

Transponder key code read error

Is key correct?

OK With other keys,

Rewrite transponder key. check for proper
operation
Please refer to “transponder programming”
on page 14. NG

OK
Rewrite all key Reregistration

NG

No
Does B8003 appear?

Yes

Check antenna wiring

NG
OK ICU replacement Correction check OK

Transponder replacement
B8004 IMMOBILIZER COIL CIRCUIT (ANTENNA COIL FAULT)

Check path between

ICU pin A-1 and pin A-3 Clear DTC
for continuity

NG

Connector 2 pin
NG Check for A1
NG
Correction Ext Harness; Antenna
ICU

A3
OK Antenna coil

Replace steering lock Assy

Need following repair

1. Key replacement
2. Rewrite transponder
3. Replace door key cylinder

B8005 COMMUNICATION LINE W VOLTAGE Low

Check path
NG between ICU pin B-8,ECM
pin for continuity

Disconnect both
connectors and check OK
path between ICU
and body earth for
continuity

Wiring repair

B8006 COMMUNICATION LINE W VOLTAGE High

Disconnect both
connectors and check No
Clear DTC
voltage on ICU side.
voltage Ǩ 2.5v

Yes

Wiring repair
B8007 NO ENGINE REQUEST RECEIVED

Check path ICU NG

pin B-7 and ECM pin A-39 Wiring repair
for continuity

OK

Replace ECM, because ECM internal circuit fails.

B8008 WRONG TRANSPONDER KEY

Rewrite transponder

Reregistration

NG

ICU replacement

B8009 NO TRANSPONDER KEY PROGRAMMED

B8010 UNKNOWN TRANSPONDER KEY

Is key correct?

OK Check other keys

Rewrite transponder key.

NG

OK Reregister
Rewrite all key transponder key

NG

ICU replacement
Immobilizer system Electrical wiring

Gasoline Engine (6VD1 3.2L)

Immobilizer system Electrical wiring

Gasoline Engine (C22NE 2.2L/22LE 2.2L/20LE 2.0L)

Immobilizer system Electrical wiring

Diesel Engine (Mechanical Control , 4JG2 3.1L/4JB1 2.8L/4JA1 2.5L)

Immobilizer system Electrical wiring

Diesel Engine (Electrical Control , 4JA1-TC 2.5L/4JH1-TC 3.0L)

 IMM-WE-0121

You are requested to order this manual using the

manual number that is shown above.

This manual is applicable for vehicles in Europe

except the USA and Canada.

All rights reserved. This manual may not be

reproduced in whole or in part, without the
permission in writing of ISUZU MOTORS LIMITED.

Issued by

ISUZU MOTORS LIMITED

INTERNATIONAL SERVICE DEPARTMENT

Tokyo, Japan

First edition April., 2002

 WORKSHOP MANUAL
TF-SERIES

Isuzu TFR/S Immobilizer

System
Service management procedure
and workshop manual

No.TF IMM-WE-0121 PRINTED IN JAPAN