Isuzu KB P190. Manual — part 1483

11A-34 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)

B0001 REPLACE ELECTRONIC CONTROL UNIT (ECU) (IMMOBILIZER FAULT)

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 B0001 stored?



Go to Step 3

Refer to

Diagnostic Aids

3

Check the immobilizer control unit (ICU) circuit.

1. Ignition "OFF," disconnect the ICU.

2. 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.

Was a problem found?



Go to Step 4

Go to Step 5

4

Repair or replace the immobilizer unit (ICU) 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-35

B0002 IMMOBILIZER NOT PROGRAMMED

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 programming functions.
• Immobilizer control unit (ICU).
If a problem is found, repair as necessary.

(Refer to "Important information on Programming")

Was the action complete?



Go to Step 3

Go to Step 5

3

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 B0002 stored?



Go to Step 4

Verify repair

4

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



5

Check the immobilizer programming functions.
• Engine control module (ECM).
• Immobilizer control unit (ICU).
If a problem is found, repair as necessary.

(Refer to "Important information on Programming")

Was the action complete?



Verify repair

Go to Step 6

6

Replace the key and lock cylinder assembly and
immobilizer system (ICU and ECM).

IMPORTANT:
• ICU and ECM are not replacing simultaneously.
• After replace lock cylinders, perform the following

below the items.

• Program the immobilizer system.
(Refer to "Important information on Programming")

Was the action complete?



Verify repair



11A-36 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)

B0003 TRANSPONDER KEY PROBLEM

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.
• All transponder (Key).
If a problem is found, repair as necessary.

(Refer to "Important information on Programming")

Was the action complete?



Go to Step 4

Go to Step 5

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 B0003 stored?



Go to Step 5

Verify repair

5

Recheck the DTC.

1. Non-OEM parts switch is "OFF" or remove the Non-

OEM parts.

2. Remove the accessory and another key from key.

3. Move the vehicle to a new location.

4. Key position is “OFF” and keep the position for more

than 30 seconds.

5. Key position is “ON”.

6. Check the DTC on scan tool.

Is DTC B0003 stored?



Go to Step 6

Verify repair

6

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 7

Go to Step 8

7

Repair or replace the immobilizer coil (antenna) circuit.

Was the action complete?



Verify repair



8

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 B0003 stored?



Go to Step 9

Verify repair

IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-37

Step Action Value(s)

Yes

No

9

Replace the immobilizer control unit (ICU).

IMPORTANT:

The replacement ICU must be

programmed the security data by scan tool.

Was the action complete?



Go to Step 10



10

Check the immobilizer programming functions.
• Immobilizer control unit (ICU).
• All transponder (Key).
If a problem is found, repair as necessary.

(Refer to "Important information on Programming")

Was the action complete?



Go to Step 11



11

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 B0003 stored?



Go to Step 12

Verify repair

12

Replace the transponder (Key).

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

Was the action complete?



Verify repair

