2004 ISUZU TF SERIES Workshop Manual

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Page 3313 of 4264

ISUZU TF SERIES 2004 Workshop Manual IMMOBILIZER SYSTEM 11A-27

4.
Input the security code, then press the soft key of
"Okay" or "Not Okay".

060R200284

5.
Enter VIN.
6.
Enter Mechanical key number.
7.
Turn ON ignition.
8.

Page 3314 of 4264

ISUZU TF SERIES 2004 Workshop Manual 11A-28 IMMOBILIZER SYSTEM

7.
See the display of programming result.

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

Follow those instructions

Selected Programming is not poss

Page 3315 of 4264

ISUZU TF SERIES 2004 Workshop Manual IMMOBILIZER SYSTEM 11A-29

4.
Insert Non-programmed Transponder-key and
press soft key of "Confirm".

060R200288

5.
"Turn On ignition key", is displayed if the ignition is
off.
6.
The trans

Page 3316 of 4264

ISUZU TF SERIES 2004 Workshop Manual 11A-30 IMMOBILIZER SYSTEM

Data List

Page 3317 of 4264

ISUZU TF SERIES 2004 Workshop Manual IMMOBILIZER SYSTEM 11A-31

Diagnostic procedure

Once the cause of DTC is repaired or gone,
engine can be operated normally, and present
DTC becomes history code.

History code is canceled by

IMMOBILIZER SYSTEM 11A-31

Diagnostic procedure

Once the cause of DTC is repaired or gone,
engine can be operated normally, and present
DTC becomes history code.

History code is canceled by no repeat failure on 25
consequence ignition key on afterward.

History code cannot be canceled by batter
y
connector disconnected.
Clearing Diagnostic Trouble Codes
IMPORTANT:
Do not clear DTCs unless directed to do
so by the service information provided for each
diagnostic procedure. When DTCs are cleared, the
Failure Record data which may help diagnose an
intermittent fault will also be erased from memory.
Verifying Vehicle Repair
Verification of vehicle repair will be more
comprehensive for vehicles with immobilizer system
diagnostic. Following a repair, the technician should
perform the following steps:
1.
Review and record the Fail Records for the DTC
which has been diagnosed.
2.
Clear DTC(s).
3.
Operate the vehicle within conditions noted in the
Fail Records.
4.
Monitor the DTC status information for the DTC
which has been diagnosed until the diagnostic test
associated with that DTC runs.
Following these steps are very important in verifying
repairs on immobilizer systems. Failure to follow these
steps could result in unnecessary repairs.
Diagnostic Aids
Check the condition for system parts.

Installation condition, poor connection, damage,
system parts malfunction. Harness, Fuse, Relay,
Immobilizer coil (antenna), Key, Meter, Immobilize
r
control unit (ICU), Engine control module (ECM).
NOE: Breakage of immobilizer fuse does not operate
immobilizer system. Check engine lamp flashes at this
time.

Check the Electro-Magnetic Interference (EMI)

Location of vehicle check

Move the vehicle to a new location and perform
the check again.

Non-OEM Parts.

Switch is "OFF" or remove the Non-OEM parts and
perform the check again.

Other

Remove the accessory and another key from key.

Check the other items.

Battery voltage is low.

Immobilizer programming functions.

Must be programmed immobilizer system.

Registration for security code, immobilizer control
unit parts number.

Key switch operation.

Immobilizer system may detect a history DTC b
y
the timing of ON-OFF of a key switch.

Active the immobilizer system.

Keyless entry system is malfunction.

Anti theft system is malfunction.

Check the operation

Check the operation "Lock / unlock" by using transmitte
r
(key) on the vehicle.

Page 3318 of 4264

ISUZU TF SERIES 2004 Workshop Manual 11A-32 IMMOBILIZER SYSTEM

Diagnostic Trouble Code (DTC) list with ECM

Immobilizer Control Unit (ICU)
DTC
Description Note
B0001
REPLACE ELECTRONIC CONTROL UNIT
(ECU) (IMMOBILIZER FAULT

Page 3319 of 4264

ISUZU TF SERIES 2004 Workshop Manual IMMOBILIZER SYSTEM 11A-33

Diagnostic Trouble Code (DTC) list with Engine Immobilizer Unit (4JA1-T Diesel Engine)

Engine Immobilizer Unit
Code
(DTC) Description Detecting Condition
B0011

Page 3320 of 4264

ISUZU TF SERIES 2004 Workshop Manual 11A-34 IMMOBILIZER SYSTEM

IMMOBILIZER SYSTEM CHECK
Step Action Value(s) Yes No
1 1. Key position is "ON," engine "OFF."
2. Observe the check engine lamp.
Note: When a key switch is turned O

11A-34 IMMOBILIZER SYSTEM

IMMOBILIZER SYSTEM CHECK
Step Action Value(s) Yes No
1 1. Key position is "ON," engine "OFF."
2. Observe the check engine lamp.
Note: When a key switch is turned ON, check engine
lamp will turn on and a check engine lamp will be
turned off after a few seconds.
Is the check engine lamp "ON"?
Go to Step 2
Go to "No
Immobilizer
warning lamp"
2 1. Key position is "ON," engine "OFF."
2. Observe the check engine lamp.
Note: When a key switch is turned ON, check engine
lamp will turn on and a check engine lamp will be
turned off after a few seconds.
Is the check engine lamp "OFF"?
(Check engine lamp does not flash)
Go to Step 3
Go to
"Immobilizer
warning lamp on
steady"
3 1. Key position is "OFF."
2. Install a scan tool.
3. Key position is "ON."
4. Attempt to display immobilizer data with the scan
tool.
Does the scan tool display immobilizer data?
Go to Step 9
Go to Step 4
4 1. Key position is "OFF," disconnect the immobilizer
control unit (ICU).
2. Check the DLC (Data Link Connector) circuit for
an open, short to ground, or short to voltage.
Also, check the DLC ignition feed circuit for an
open or short to ground and the DLC ground
circuit for an open.
Was a problem found?
Go to Step 5
Go to Step 6
5 Repair or replace the DLC (Data Link Connector)
circuit.
Was the action complete?
Go to Step 3
6
1. Check the ICU circuit for an open, short to ground,
or short to voltage. Also, check the ICU ignition
feed circuit for an open or short to ground and the
ICU ground circuit for an open.
2. If a problem is found, repair as necessary.
Was a problem found?
Go to Step 7
Go to Step 8
7 Repair or replace the ICU ignition feed and ground
circuits.
Was the action complete?
Go to Step 3
8 Replace the immobilizer control unit (ICU).
IMPORTANT:
The replacement ICU must be
programmed the immobilizer data by the scan tool.
Was the action complete?
Go to Step 3
9 Select "Display DTCs" with the scan tool.
Are any DTCs stored?
Go to Step 10
Go to Step 13

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