Isuzu KB P190. Manual — part 1504

11B-62 ANTITHEFT SYSTEM

DTC 51 EEPROM Defect

Step Action Value

(s)

Yes

No

1

Was 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 51 stored?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Replace the antitheft control unit (ACU).

IMPORTANT: The replacement ACU must be
programmed the security data by the Tech-2.

Was the action complete?

—

Verify repair

—

ANTITHEFT SYSTEM 11B-63

DTC 52 EEPROM Not Programmed By ISUZU

Step Action Value

(s)

Yes

No

1

Was the Antitheft System Check performed?

— Go

to

Step 2

Go to antitheft

System Check

2

Check the antitheft programming functions for EOL
information with the Tech-2.

Was a problem found?

—

Go to Step 3 Go

to

Step 4

3

Perform the antitheft programming functions.
• IOL information

(Refer to “Important information on

Programming”)

Was the action complete?

—

Go to Step 4 —

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 52 stored?

—

Go to Step 5 Verify

repair

5

Replace the antitheft control unit (ACU).

IMPORTANT: The replacement ACU must be
programmed the security data by the Tech-2.

Was the action complete?

—

Verify repair

—

11B-64 ANTITHEFT SYSTEM

DTC 55 Control unit defect

Step Action Value

(s)

Yes

No

1

Was the Antitheft System Check performed?

— Go

to

Step 2

Go to antitheft

System Check

2

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 55 stored?

—

Go to Step 3 Verify

repair

3

Replace the antitheft control unit (ACU).

IMPORTANT: The replacement ACU must be
programmed the security data by the tech2.

Was the action complete?

—

Verify repair

—

ANTITHEFT SYSTEM 11B-65

DTC 123 Output flasher short circuit to ground or broken wire

Step Action Value

(s)

Yes

No

1

Was 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 tech2 on vehicle.

3. Key position is “ON”.

4. Check the DTC on the tech2.
Is DTC 123 stored?

—

Go to Step 3

Refer to

Diagnostic Aids

3

1. Check the flasher circuit for an open, short to

ground, or short to voltage.

Also, check the flasher connector for damage.

2. If a problem found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 4

4

Check the flasher function.

1. Key position is “OFF”.

2. Connect a jumper wire between ACU terminal 28

and body ground.

3. Key position is “ON”.

4. Observe to operate flasher lamp.
If the problem found about the flasher lamp circuit,
repair as necessary.

Was the problem found?

—

Verify repair

Go to Step 5

5

Replace the antitheft control unit (ACU).

IMPORTANT: The replacement ACU must be
programmed the security data by the tech2.

Was the action complete?

—

Verify repair

—