Isuzu KB P190. Manual — part 1487

11A-50 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)

B0014 NO TRANSPONDER KEY PROGRAMMED (Only 4JA1-T Engine)

Step Action Value(s)

Yes

No

1

Was the "Immobilizer System Check" performed?



Go to Step 2

Go to Immobilizer

System Check

2

Check the key.

Is a key peculiar to a vehicle?



Go to Step 3

Refer to

Diagnostic Aids

3

Check the immobilizer programming functions.
• Transponder (Key).
Was a problem found?



Go to Step 4

Go to Step 5

4

Perform the immobilizer programming functions.
• Transponder (Key).
(Refer to "Important information on Programming")

Was the action complete?



Go to Step 5



5

Recheck the DTC.

1. Key position is “OFF” and keep the position for

more than 30 seconds.

2. Key position is “ON”.

3. Check the DTC on scan tool.

Is DTC B0014 stored?



Go to Step 6

Verify repair

6

Replace the transponder (Key).

IMPORTANT: The replacement transponder (key)
must be programmed the security data by scan tool.

Was the action complete?



Go to Step 7



7

Recheck the DTC.

1. Key position is “OFF” and keep the position for

more than 30 seconds.

2. Key position is “ON”.

3. Check the DTC on scan tool.

Is DTC B0014 stored?



Go to Step 8

Verify repair

8

Replace the immobilizer control unit (ICU).

IMPORTANT: The replacement ICU must be
programmed the security data by scan tool.

Was the action complete?



Verify repair



IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-51

B0015 FREQUENCY SIGNAL LOW (Only 4JA1-T Engine)

Step Action Value(s)

Yes

No

1

Was the "Immobilizer System Check" performed?



Go to Step 2

Go to Immobilizer

System Check

2

Recheck the DTC.

1. Key position is “OFF”.

2. Install the scan tool on vehicle.

3. Key position is “ON”.

4. Check the DTC on scan tool.
Is DTC B0015 stored?



Go to Step 3

Refer to

Diagnostic Aids

3

Check the immobilizer communication W line circuit.

1. Key position is “OFF”.

2. Disconnect the immobilizer control unit (ICU).

3. Disconnect the Engine immobilizer unit.

4. Check the immobilizer communication W line

circuit for an open, short to ground, or short to

voltage.

Also, check the ICU and Engine immobilizer unit

ignition feed circuits for an open or short to ground

and the ICU and Engine immobilizer unit ground

circuit for an open.

Was a problem found?



Go to Step 4

Go to Step 5

4

Repair or replace the immobilizer communication W
line circuit.

Was the action complete?



Verify repair



5

Replace the immobilizer control unit (ICU).

IMPORTANT: The replacement ICU must be
programmed the security data by scan tool.

Was the action complete?



Verify repair



11A-52 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)

B0016 FREQUENCY SIGNAL HIGH (Only 4JA1-L Engine)

Step Action Value(s)

Yes

No

1

Was the "Immobilizer System Check" performed?



Go to Step 2

Go to Immobilizer

System Check

2

Recheck the DTC.

1. Key position is “OFF”.

2. Install the scan tool on vehicle.

3. Key position is “ON”.

4. Check the DTC on scan tool.

Is DTC B0016 stored?



Go to Step 3

Refer to

Diagnostic Aids

3

Check the immobilizer communication W line circuit.

1. Key position is “OFF”.

2. Disconnect the immobilizer control unit (ICU).

3. Disconnect the engine control module (Engine

immobilizer unit).

4. Check the immobilizer communication W line

circuit for an open, short to ground, or short to

voltage.

Also, check the ICU and Engine immobilizer unit
ignition feed circuits for an open or short to ground
and the ICU and Engine immobilizer unit ground
circuit for an open.

Was a problem found?



Go to Step 4

Go to Step 5

4

Repair or replace the immobilizer communication W
line circuit.

Was the action complete?



Verify repair



5

Replace the immobilizer control unit (ICU).

IMPORTANT: The replacement ICU must be
programmed the security data by scan tool.

Was the action complete?



Verify repair



IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-53

B0023 IMMOBILIZER COIL CIRCUIT (ANTENNA COIL FAULT)

(Only 4JA1-T Engine)

Step Action Value(s)

Yes

No

1

Was the "Immobilizer System Check" performed?



Go to Step 2

Go to Immobilizer

System Check

2

Check the immobilizer coil (antenna) circuit.

1. Key position is “OFF”.

2. Disconnect the immobilizer control unit (ICU).

(immobilizer coil circuit : 3 pin connector)

3. Check the immobilizer coil 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.

Was a problem found?



Go to Step 3

Go to Step 4

3

Repair or replace the immobilizer coil (antenna).

Was the action complete?



Verify repair



4

Recheck the DTC.

1. Key position is “OFF” and keep the position for

more than 30 seconds.

2. Key position is “ON”.

3. Check the DTC on scan tool.

Is DTC B0023 stored?



Go to Step 5

Verify repair

5

Replace the immobilizer control unit (ICU).

IMPORTANT: The replacement ICU must be
programmed the security data by scan tool.

Was the action complete?



Verify repair

