ISUZU TF SERIES 2004 Workshop Manual
TF SERIES 2004
ISUZU
ISUZU
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ISUZU TF SERIES 2004 Workshop Manual
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11B – 36 ANTITHEFT SYSTEM
Diagnostic Trouble Code (DTC) List For Antitheft
DTC Description
13 Security code not yet programmed
14 No remote key programmed
16 Door lock actuators short circuit to ground
20 Broken wire to door lock actuators
21 Remote key 1 with random code out of capture range
22 Remote key 2 with random code out of capture range
23 Remote key 3 with random code out of capture range
24 Remote key 4 with random code out of capture range
25 Remote key 5 with random code out of capture range
28 Input immobiliser short circuit to ground
29 Broken wire to immobiliser
31 Actuator driver door defect
32 Actuator passenger door defect
36 Broken wire to driver door
37 Broken wire to passenger door
41 Driver door switch unlock defect
42 Driver door switch lock defect
43 Driver door switch dead lock defect
44 Passenger door switch lock defect
45 Passenger door switch unlock defect
47 Battery voltage for door lock actuators is missing
50 A/D converter defect or battery voltage less than 9 volt
51 E E P ROM defect
52 E E P ROM not programmed by ISUZU
55 Control unit defect
123 Output flasher short circuit to grpund or broken wire
125 Output alarm horn broken wire
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ANTITHEFT SYSTEM 11B – 37
Antitheft System Check
Step Action Value (s) Yes No
1
2
3
4
5
6
7
8
91. Key position is “ACC”, shut all doors and
bonnet.
2. Observe the antitheft lamp.
Note: When a key switch is “ACC”, antithft
lamp will turn on and a antitheft lamp (LED)
will be flashing after 10 seconds.
Is the antitheft lamp "ON” or flashing?
1. Key position is “ON”, engine “OFF”.
2. Observe the antitheft lamp.
3. Key position is turned “ACC”.
4. Check the antitheft lamp will be turned
flashing and lamp will be turned ACC after 10
seconds.
Is the antitheft lamp flashing?
1. Key position is “OFF”.
2. Install the Tech-2.
3. Key position is “ON” or “OFF”.
4. Attempt to display antitheft data with the
Tech-2.
Does the Tech-2 display antitheft data?
1. Key position is “OFF”, disconnect the
antitheft control unit (ACU).
2. Check the DLC (Data Link Connector) circuit
for an open, short to ground, or short to
voltage.
Also, check the DLC ignition feed circuit for an
open or short to ground and the DLC ground
circuit for an open.
Was a problem found?
Repair or replace the DLC (Data Link Connector)
circuit.
Was the action complete?
1. Check the ACU ground circuit for an open, or
short to voltage. Also, check the ACU ignition
feed circuit for an open or short to ground
and the ACU ground circuit for an open.
2. If a problem is found, repair as necessary.
Was the problem found?
Replace the antitheft control unit (ACU).
IMPORTANT: The replacement ACU must be
programmed the antitheft data by Tech-2.
Was the action complete?
Select “Display DTCs” with the Tech-2.
Are any DTCs stored?
1. Observe the antitheft data list on Tech-2.
2. If a problem is found, repair as necessary.
Was the problem found?—
—
—
—
—
—
—
—
—Go to Step 2
Go to
DTC table
Go to Step 9
Go to Step 5
Go to Step 3
Verfy repair
Go to Step 8
Go to applicable
DTC table
System OKGo to
“No antitheft
lamp”
Go to Step 3
Go to Step 4
Go to Step 6
—
Go to Step 7
—
—
Go to
applicable
section
Page 3384 of 4264

11B – 38 ANTITHEFT SYSTEM
No Antitheft Lamp
Step Action Value (s) Yes No
1
2
3
4
5
6Check the fuse for the antitheft power feed
circuit. (10A)
If a problem found, repair as necessary.
Was the probem found?
Is the action complete?
1. Check the ACU ground circuit for an open, or
short to voltage. Also, check the ACU ignition
feed circuit for an open or short to ground
and the ACU ground circuit for an open.
2. If a problem is found, repair as necessary.
Was the problem found?
1. Check the antitheft lamp LED circuit for an
open, or short to voltage.
2. If a problem is found, repair as necessary.
Was the problem found?
1. Key position is “OFF”.
2. Install the Tech-2.
3. Key position is “ACC” or “OFF”.
4. Observe to display lamp data with the Tech-2.
Does the Tech-2 display antitheft lamp data ON?
Replace the antitheft lamp.
Replace the antitheft control unit (ACU).
IMPORTANT:The replacement ACU must be
programmed the antitheft data by Tech-2.
Was the action complete?—
—
—
—
—
—Verify repair
Verfy repair
Verify repair
Go to Step 5
Verify repair
Verify repairGo to Step 2
Go to Step 3
Go to Step 4
Go to Step 6
—
—
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ANTITHEFT SYSTEM 11B – 41
DTC 16 Door Lock Actuators Short Circuit to Ground
Step Action Value (s) Yes No
1
2
3
4Was the Antitheft System Check
performed?
Check the door lock actuators circuit.
1. Key position is “OFF”.
2. Disconnect the antitheft control unit (ACU).
3. Check the door lock actuator circuit for short
to ground.
If the problem found, repair as necessary.
Was a problem found?
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 the Tech-2.
Is DTC 16 stored?
Replace the antitheft control unit (ACU).
IMPORTANT: The replacement ACU must be
programmed the security data by the Tech-2.
Was the action complete?—
—
—
—Go to Step 2
Verify repair
Go to Step 5
Verify repairGo to antitheft
System Check
Go to Step 3
Verify repair
—
Page 3388 of 4264

11B – 42 ANTITHEFT SYSTEM
DTC 20 Broken wire to door lock actuators
Step Action Value (s) Yes No
1
2
3
4
5Was the Antitheft System Check
performed?
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 20 stored?
Check the door lock actuator circuit.
1. Key position is “OFF”.
2. Disconnect the antitheft control unit (ACU).
3. Disconnect the door lock motor.
4. Check the antitheft/door lock motor line
circuit for an open, short to ground.
Also, check the ignition feed circuits for an
open or short to ground and the ACU ground
circuit for an open.
Was a problem found?
Repair or replace the antitheft/door lock motor
circuit.
Was the action complete?
Replace the antitheft control unit (ACU).
IMPORTANT: The replacement ACU must be
programmed the security data by the tech2.
Was the action complete?—
—
—
—
—Go to Step 2
Go to Step 3
Go to Step 4
Verify repair
Verify repairGo to antitheft
System Check
Refer to
Diagnostic Aids
Go to Step 5
—
—
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