Isuzu KB P190. Manual — part 1503

11B-58 ANTITHEFT SYSTEM

DTC 44 Passenger Door Lock Switch lock 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 44 stored?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Check the passenger door lock function.

1. Key position is “OFF”.

2. Install the Tech-2 on vehicle.

3. Key position is “OFF”.

4. Observe to display door lock switch data with the

Tech-2.

5. Turn ON by passenger door lock.
Does the Tech-2 display Closed?

—

Go to Step 4 Go

to

Step 5

4

1. Key position is “OFF”.

2. Observe to display door lock data with the Tech-2.

3. Turn OFF by passenger door lock.
Does the Tech-2 display Open ?

—

Refer to

Diagnostic Aids,

and then go to

step 5 Go

to

Step 5

5

1. Check the passenger door lock switch circuit for

an open, short to ground, or short to voltage.

Also, check the door lock connector for damage.

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

—

Verify repair

Go to Step 6

6

1. Repair or replace the passenger door lock switch.

2. Check the DTC on the Tech-2.
Is DTC 44 stored?

—

Go to Step 7 Verify

repair

7

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-59

DTC 45 Passenger Door Lock Switch Unlock 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 44 stored?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Check the passenger door lock function.

1. Key position is “OFF”.

2. Install the Tech-2 on vehicle.

3. Key position is “OFF”.

4. Observe to display door lock switch data with the

Tech-2.

5. Turn ON by passenger door lock.
Does the Tech-2 display Closed ?

—

Go to Step 4 Go

to

Step 5

4

1. Key position is “OFF”.

2. Observe to display door lock data with the Tech-2.

3. Turn OFF by passenger door lock.
Does the Tech-2 display Open ?

—

Refer to

Diagnostic Aids,

and then go to

step 5 Go

to

Step 5

5

1. Check the passenger door lock switch circuit for

an open, short to ground, or short to voltage.

Also, check the door lock connector for damage.

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

—

Verify repair

Go to Step 6

6

1. Repair or replace the passenger door lock switch.

2. Check the DTC on the Tech-2.
Is DTC 45 stored?

—

Go to Step 7 Verify

repair

7

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-60 ANTITHEFT SYSTEM

DTC 47 Battery Voltage For Door Lock Actuators Is Missing

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 47 stored?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Check the antilock system voltage.

1. Key position is “OFF”.

2. Install the Tech-2 on vehicle.

3. Key position is “ON”.

4. Observe to display system voltage data with the

Tech-2.

Is the voltage near the specified value ?

—

Go to Step 5 Go

to

Step 4

4

1. Key position is “OFF”.

2. Check the battery voltage.

3. If a problem found, repair as necessary. (Chage

battery)

Was the problem found?

—

Verify repair

Refer to

Diagnostic Aids

5

Check the door lock motor output voltage.

1. Key position is “OFF”.

2. Connect a digital volt meter to measure voltage.

between ACU terminal 7 and body ground.

3. Key position is “ON”.

4. Observe to display voltage with the DVM.

5. Door lock ON.
Is the voltage near the specified value ?

—

Go to Step 6 Go

to

Step 7

6

1. Check the door lock motor circuit for an open,

short to ground, or short to voltage.

Also, check the door lock motor connector for

damage.

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

—

Verify repair

—

7

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-61

DTC 50 A/D Converter Defect Or Battery Voltage Less Than 9 Volt

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 50 stored?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Check the antilock system voltage.

1. Key position is “OFF”.

2. Install the Tech-2 on vehicle.

3. Key position is “ON”.

4. Observe to display system voltage data with the

Tech-2.

Is the voltage near the specified value ?

—

Go to Step 6 Go

to

Step 4

4

1. Key position is “OFF”.

2. Check the battery voltage.

3. If a problem found, repair as necessary. (Chage

battery)

Was the problem found?

—

Verify repair

Go to Step 5

5

1. Check the ignition feed circuit for an open, short to

ground.

Also, check the ACU ground circuit for damage.

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

—

Verify repair

Refer to

Diagnostic Aids

6

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

—