Isuzu KB P190. Manual - part 1469

IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)   11A-25

6

Important: Replacement transponder key must be
programmed.
Replace the transponder key that indicates No
Transponder Key at Step 4. Refer to Resetting and
Programming Guidelines in this section.

Did you complete the replacement?

—

Go to Step 8

—

7

Important: Replacement ICU must be
programmed.
Replace the ICU.  Refer to ICU Replacement.

Did you complete the replacement?

—

Go to Step 8

—

8

1.

Clear the DTCs with a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition.

Did the DTC fail this ignition?

—

Go to Step 2

Go to Step 9

9

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

No

11A-26   IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)

DTC B0004

Circuit Description

An antenna coil is a part of the ICU and it is located
around steering key lock cylinder. An antenna coil is
energized when the ICU is performing an
authentication of the transponder key. If the ICU
detects an open circuit or short circuit on the antenna
coil circuit, this DTC will set.

Condition for Running the DTC

• The ignition switch is ON.

Condition for Setting the DTC

• The ICU detects an open circuit or short circuit on

the antenna coil circuit.

Action Taken When the DTC Sets

• The engine will fail to run if the fault occurs before

starting the engine.

Condition for Clearing the DTC

• A current DTC clears once ignition cycle has

occurred without the fault recurring.

• A history DTC will clear after 50 consecutive

ignition cycles, if the condition for malfunction is no
longer present.

• Use a scan tool to clear the DTC.

Diagnostic Aids

• Improper installation of ICU will set this DTC.

Circuit/ System Testing DTC B0004

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Immobilizer Controls?

—

Go to Step 2

Go to Diagnostic 

System Check - 

Immobilizer 

Controls

2

1.

Inspect the ICU for the following conditions:

• Physical damage of ICU

• Improper installation of ICU

2.

Repair or replace as necessary.

Did you find and correct the condition?

—

Go to Step 4

Go to Step 3

3

Important: Replacement ICU must be
programmed.
Replace the ICU.  Refer to ICU Replacement.

Did you complete the replacement?

—

Go to Step 5

—

4

1.

Clear the DTCs with a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition.

Did the DTC fail this ignition?

—

Go to Step 2

Go to Step 5

5

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)   11A-27

DTC B0007

Circuit Description

When the transponder key authentication is completed,
the ICU begins authentication of the ECM. The ECM
transmits a specific request signal to the ICU and the
ICU sends back a response signal to the ECM. Both
communication signals are carried out via a controller
area network (CAN) communication bus. If the ICU
does not detect a request signal from the ECM, this
DTC will set.

Condition for Setting the DTC

• The ICU does not receive a request signal from the

ECM.

Action Taken When the DTC Sets

• The engine will fail to run if the fault occurs before

starting the engine.

Condition for Clearing the DTC

• A current DTC clears once ignition cycle has

occurred without the fault recurring.

• A history DTC will clear after 50 consecutive

ignition cycles, if the condition for malfunction is no
longer present.

• Use a scan tool to clear the DTC.

Diagnostic Aids

• Electromagnetic interference may affect

intermittent condition.

• If the ignition switch is cycled (ON > OFF > ON)

rapidly, this DTC may set but engine starts. This is
normal and a current DTC clears once ignition
cycle has been normally occurred.

Circuit/ System Testing DTC B0007

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Immobilizer Controls?

—

Go to Step 2

Go to Diagnostic 

System Check - 

Immobilizer 

Controls

2

1.

Install a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition, with the engine OFF.

4.

Select the Engine in the system selection
menu.

5.

Attempt to communicate with the ECM via the
Engine Data table.

Does the scan tool communicate with the ECM?

—

Go to Step 3

Go to Diagnostic 

System Check - 
Engine Controls

3

Monitor the ECM DTC Information with a scan tool.

Is DTC U0001 set?

—

Go to DTC U0001 in 

Engine Control 

Section

Go to Step 4

4

Refer to Scan Tool Does Not Communicate with
The CAN Device in this section.

Did you complete the action?

—

Go to Step 5

—

5

1.

Clear the DTCs with a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition.

Did the DTC fail this ignition?

—

Go to Step 2

Go to Step 6

6

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

11A-28   IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)

DTC B0008

Description

When the ignition switch is ON, the ICU begins
authentication of the transponder key in the steering
lock through the antenna coil. Once the ICU transmits a
signal, the transponder must send back a specific
response signal.  If the ICU receives a wrong response
signal from the transponder, this DTC will set.

Condition for Running the DTC

• The ignition switch is ON.

Condition for Setting the DTC

• The ICU receives a wrong response signal from

the transponder key.

Action Taken When the DTC Sets

• The engine will not start if the fault occurs before

starting the engine.

Condition for Clearing the DTC

• A current DTC clears once ignition cycle has

occurred without the fault recurring.

• A history DTC will clear after 50 consecutive

ignition cycles, if the condition for malfunction is no
longer present.

• Use a scan tool to clear the DTC.

Diagnostic Aids

• If the transponder key or ICU is transferred

(swapped) from another vehicle, this DTC will set.

Circuit/ System Testing DTC B0008

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Immobilizer Controls?

—

Go to Step 2

Go to Diagnostic 

System Check - 

Immobilizer 

Controls

2

1.

Install a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition, with the engine OFF.

4.

Monitor the DTC Information with a scan tool.

Is DTC B0009 also set?

—

Go to DTC B0009

Go to Step 3

3

Inspect all programmed transponder keys while
observing the Transponder Key parameter with a
scan tool.

Is there a transponder key that indicates Invalid
when ignition switch is ON?

—

Go to Step 4

Go to Diagnostic 

Aids

4

Does only specific transponder key indicate
Invalid?

—

Go to Step 5

Go to Step 6

5

Important: Replacement transponder key must be
programmed.
Replace the transponder key that indicates Invalid
at Step 3. Refer to Resetting and Programming
Guidelines in this section.

Did you complete the replacement?

—

Go to Step 7

—

6

Important: Replacement ICU must be
programmed.
Replace the ICU.  Refer to ICU Replacement.

Did you complete the replacement?

—

Go to Step 7

—

7

1.

Clear the DTCs with a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition.

Did the DTC fail this ignition?

—

Go to Step 2

Go to Step 8

8

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK