ANTITHEFT SYSTEM 11B-49
DTC 28 Input Immobilizer short circuit to ground
Step Action Value (s) Yes No
1 W as the Antitheft System Check performed?
— Go to Step 2 Go to
antitheft
System Check
2 Recheck the DTC.
1. Key position is “OFF”.
2. Install the Tech-2 on vehicle.
3. Key position is “ON”.
4. Check the DTC on the Tech-2.
Is DTC 28 stored? — Go to Step 3 Refer to
Diagnostic Aids
3 Check the driver door locking motor function.
line circuit.
1. Key position is “OFF”.
2. Install the Tech-2 on vehicle.
3. Key position is “ON”.
4. Check the antitheft/Immobilizer communication line circuit for short to voltage, short to ground.
Also, check the ICU and ACU ignition feed circuits for an open or short to ground and the ICU and
ACU ground circuit for an open.
W as a problem found? — Go to Step 4 Go to Step 5
4 Repair or replace the antitheft/Immobilizer
communication line circuit.
W as the action complete? — Verify repair —
5 Replace the antitheft control unit (ACU). IMPORTANT: The replacement ACU must be
programmed the security data by the Tech-2.
W as the action complete? — Verify repair —
BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007
11B-50 ANTITHEFT SYSTEM
DTC 29 Broken Wire To Immobilizer
Step Action Value (s) Yes No
1 W as the Antitheft System Check
performed? — Go to Step 2 Go to
antitheft
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 the Tech-2.
Is DTC 29 stored? — Go to Step 3 Refer to
Diagnostic Aids
3 Check the antitheft/immobilizer communication line circuit.
1. Key position is “OFF”.
2. Disconnect the antitheft control unit (ACU).
3. Disconnect the immobilizer control unit (ICU).
4. Check the antitheft/Immobilizer communication line circuit for an open, short to ground.
Also, check the ICU and ACU ignition feed circuits for
an open or short to ground and the ICU and ACU
ground circuit for an open.
W as a problem found? — Go to Step 4 Go to Step 5
4 Repair or replace the antitheft/Immobilizer
communication line circuit.
W as the action complete? — Verify repair —
5 Replace the antitheft control unit (ACU). IMPORTANT: The replacement ACU must be
programmed the security data by the Tech-2.
W as the action complete? — Verify repair —
BACK TO CHAPTER INDEX TO MODEL INDEX
ISUZU KB P190 2007
