Isuzu KB P190. Manual - part 1468

IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)   11A-21

Diagnostic Trouble Code (DTC) List

DTC

DTC Descriptor

B0001

Replace Electronic Control Unit (ECU)

B0002

Immobilizer Not Programmed

B0003

Transponder Key Problem

B0004

Immobilizer Coil Circuit

B0007

No Engine Request Received

B0008

Wrong Transponder Key

B0009

No Transponder Key Programmed

B0010

Unknown Transponder Key

B0012

Default Transponder Detected

B0013

Previously Erased Transponder

B0014

Secret Key Error

U0100

Lost Communication With ECM

11A-22   IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)

DTC B0001 

Description

This diagnostic applies to internal microprocessor
integrity conditions within the ICU.

Condition for Setting the DTC

• The ECM detects a faulty writing in its internal

electrically erasable & programmable read only
memory (EEPROM).

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.

Circuit/ System Testing DTC B0001

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.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Step 4

3

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

Did you complete the replacement?

—

Go to Step 4

—

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 3

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-23

DTC B0002

Description

The electrically erasable programmable read only
memory (EEPROM) memorizes immobilizer security
code and transponder key information. If the ICU
detects immobilizer security code is not programmed
into the ICU, this DTC will set.

Condition for Setting the DTC

• The ICU detects that the security code is not

programmed.

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

• Non-programmed ICU sets this DTC.

Circuit/ System Testing DTC B0002

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.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Diagnostic 

Aids

3

Program immobilizer security information into the
ICU. Refer to Resetting and Programming
Guidelines in this section.

Did you complete the programming?

—

Go to Step 4

—

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 3

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

11A-24   IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)

DTC B0003

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 never receives a 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 does not receive a response signal from

the transponder key.

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.

• An antenna coil problem may set this DTC.

• Objects that block transponder key in the steering

lock may set this DTC.

• Another key that is attached to the key ring may

affect this DTC to set.

• If the ignition switch has been turned ON without

transponder key this DTC sets.

Circuit/ System Testing DTC B0003

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 B0004 also set?

—

Go to DTC B0004

Go to Step 3

3

1.

Inspect the transponder key(s) and the ICU for
the following conditions:

• Physical damage of transponder key(s)

or ICU

• Improper installation of ICU

• Improper transponder key

• Objects such as key ring or metal that

touch transponder key or antenna coil

• Objects such as key ring or metal that

cover transponder key or antenna coil

2.

Repair the condition(s) as necessary.

Did you find and correct the condition?

—

Go to Step 8

Go to Step 4

4

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

Is there a transponder key that indicates No
Transponder Key when ignition switch is ON?

—

Go to Step 5

Go to Diagnostic 

Aids

5

Does only specific transponder key indicate No
Transponder Key?

—

Go to Step 6

Go to Step 7