Isuzu N-Series. Manual - part 265

5A4-34 ABS/ASR

6

ASR lamp only comes on 
when driving.

Normal if ASR off switch 
has been operated.
If not, the ASR off switch 
circuit is faulty.
Check the ASR off switch 
itself, and the harness 
between the ASR off 
switch and the EHCU 
connector terminal 5.

7

ASR lamp only blinks 
when driving.

ASR is in operation. It is 
normal.

No.

Lamp condition

Warning lamp illumination pattern

Diagnostic flow

N5A2034E

N5A2035E

ABS/ASR 5A4-35

ABS Warning Lamp does not Come on with the Starter Switch ON.

Check flow B-1-1

Step

Action

Value

YES

NO

1

Is the F-16 meter backup lamp fuse blown?

—

Go to Step5

Go to Step2

2

Is the warning lamp bulb blown?

—

Go to Step6

Go to Step3

3

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Turn the starter switch ON.
4. Measure the voltage between the B-51

connector terminal 18 and the J-177 con-
nector terminal 1,23.

Is the voltage within specified value?

16.5 — 34V

Go to Step4

Go to Step7

4

Check for continuity between the J-177 con-
nector terminal 1,23 and the body ground.

Is there continuity?

—

Go to Step9

Go to Step8

5

Replace the fuse.

Is this step completed?

—

Go to Step10

—

6

Replace the warning lamp.

Is this step completed?

—

Go to Step10

—

7

Repair the circuit for open/short circuit, and
the connector for improper connection.

Is this step completed?

—

Go to Step10

—

8

Repair the circuit for open/short circuit, and
the connector for improper connection.

Is this step completed?

—

Go to Step10

—

9

1. Check the suspicious circuit for improper

connection.

2. If the connection is normal, replace the

EHCU.

Is this step completed?

—

Go to Step10

—

10

1. Install all the components, and check that

those are installed properly.

2. Clear the DTC.

Is this step completed?

—

Go to “Diagnostic 

basic flow”.

—

5A4-36 ABS/ASR

ABS Warning Lamp Repeats Blinking After Turning the Starter Switch to ON.

Check flow B-1-2

Step

Action

Value

YES

NO

1

Is anything connected to the self-diagnosis
connector?

—

Go to Step2

Go to Step3

2

Disconnect the connection.

Is this step completed?

—

Go to Step7

—

3

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.

Check for continuity between the J-177 con-
nector terminal 4 and the J-177 connector ter-
minal 1,23. Is there continuity?

—

Go to Step4

Go to Step5

4

Repair the circuit of the diagnosis connector
J-177 terminal 4 and the B-79 connector ter-
minal 12.

Is this step completed?

—

Go to Step7

—

5

Is there any other trouble symptom?

—

Check according 
to the check flow 

of such symptom.

Go to Step6

6

Replace the EHCU.

Is this step completed?

—

Go to Step7

—

7

Install all the components, and check that
those are installed properly.

Is this step completed?

—

Go to “Diagnostic 

basic flow”.

Go to Step7

ABS/ASR 5A4-37

ABS Warning Lamp Repeats Blinking After Turning the Starter Switch to ON.

Check flow B-1-3

Step

Action

Value

YES

NO

1

Is anything connected to the self-diagnosis
connector?

—

Go to Step2

Go to Step3

2

Disconnect the connection.

Is this step completed?

—

Go to Step7

—

3

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.

Is there continuity between the J-177 connec-
tor terminal 4 and the J-177 connector termi-
nal 1, 23?

—

Go to Step4

Go to Step5

4

Repair the circuit between the diagnosis con-
nector J-177 terminal 4 and the B-79 connec-
tor terminal 12.

Is this step completed?

—

Go to Step7

—

5

Is there any other trouble symptom?

—

Check according 
to the check flow 

of such symptom.

Go to Step6

6

Replace the EHCU.

Is this step completed?

—

Go to Step7

—

7

Install all the components, and check that
those are installed properly.

Is this step completed?

—

Go to “Diagnostic 

basic flow”.

Go to Step7