Page 5945 of 6020
IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-47
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.
W as 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")
W as 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 B0011 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.
W as the action complete?
Verify repair
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ISUZU KB P190 2007
Page 5946 of 6020

11A-48 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
B0012 WRONG TRANSPONDER KEY (Only 4JA1-T Engine)
Step Action Value(s) Yes No
1
W as 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).
W as 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")
W as 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 B0012 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.
W as 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 B0012 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.
W as the action complete?
Verify repair
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TO MODEL INDEX
ISUZU KB P190 2007
Page 5947 of 6020

IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-49
B0013 IMMOBILIZER NOT PROGRAMMED (Only 4JA1-T Engine)
Step Action Value(s) Yes No
1
W as 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")
W as 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 B0013 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.
W as the action complete?
Verify repair
5 Check the immobilizer programming functions.
• Engine control immobilizer unit.
• Immobilizer control unit (ICU).
If a problem is found, repair as necessary.
(Refer to "Important information on Programming")
W as the action complete?
Verify repair Go to Step 6
6 Replace the key and lock cylinder assembly and
immobilizer system (ICU and Engine immobilizer
unit).
IMPORTANT:
• ICU and Engine immobilizer unit are not
replacing simultaneously.
• After replace lock cylinders, perform the
following below the items.
• Program the immobilizer system.
(Refer to "Important information on Programming")
W as the action complete?
Verify repair
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TO MODEL INDEX
ISUZU KB P190 2007
Page 5948 of 6020

11A-50 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
B0014 NO TRANSPONDER KEY PROGRAMMED (Only 4JA1-T Engine)
Step Action Value(s) Yes No
1
W as 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).
W as 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")
W as 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.
W as 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.
W as the action complete?
Verify repair
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TO MODEL INDEX
ISUZU KB P190 2007
Page 5949 of 6020

IMMOBILIZER SYSTEM (C24SE, 4JA1-T) 11A-51
B0015 FREQUENCY SIGNAL LOW (Only 4JA1-T Engine)
Step Action Value(s) Yes No
1 W as 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.
W as a problem found?
Go to Step 4 Go to Step 5
4 Repair or replace the immobilizer communication W
line circuit.
W as 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.
W as the action complete?
Verify repair
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 5950 of 6020

11A-52 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
B0016 FREQUENCY SIGNAL HIGH (Only 4JA1-L Engine)
Step Action Value(s) Yes No
1
W as 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.
W as a problem found?
Go to Step 4 Go to Step 5
4 Repair or replace the immobilizer communication W
line circuit.
W as 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.
W as the action complete?
Verify repair
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TO MODEL INDEX
ISUZU KB P190 2007
Page 5951 of 6020

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
W as 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.
W as a problem found?
Go to Step 3 Go to Step 4
3 Repair or replace the immobilizer coil (antenna).
W as 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.
W as the action complete?
Verify repair
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
Page 5952 of 6020

11A-54 IMMOBILIZER SYSTEM (C24SE, 4JA1-T)
B0024 WRONG TRANSPONDER KEY (Only 4JA1-T Engine)
Step Action Value(s) Yes No
1
W as 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).
W as 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")
W as 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 B0024 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.
W as 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 B0024 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.
W as the action complete?
Verify repair
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007