Isuzu N-Series. Service manual - part 271

5A4-58 ABS/ASR

17

Check the FR wheel speed sensor circuit.
(Refer to the check flow B-14.)

Is this step completed?

—

Check the repair.

—

18

Check the circuit for open circuit, and the con-
nector for improper connection between the
EHCU and the speed sensor connector. Refer
to “Intermittent trouble”.

Is this step completed?

—

Go to Step21

—

19

Repair the circuit for open/short circuit, and
the connector for improper connection
between the EHCU connector and the speed
sensor connector.

Is this step completed?

—

Go to Step21

Go to Step21

20

Replace the EHCU.

Is this step completed?

—

Go to Step21

—

21

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”.

Go to Step21

Step

Action

Value

YES

NO

ABS/ASR 5A4-59

DTC:C0263 (Flash Code 63) Speed Sensor Signal Fault/Wrong Tire Size; RL

Check flow B-19

Step

Action

Value

YES

NO

1

Check the tire.

Is the tire specification correct? Is abnormal
wear found in the outer surface?

—

Go to Step2

Replace with the 

specified tire with-

out wear.Go to 

Step18

2

Has certain tire been rotated alone by perfum-
ing for jack-up or roller tester?

—

DTC may be set if 

certain tire is 

rotated alone. Go 

to Step18

Go to Step3

3

Is the FL wheel bearing rattling?

—

Go to Step10

Go to Step4

4

Is the FL wheel speed sensor/sensor rotor rat-
tling?

—

Go to Step11

Go to Step5

5

Is iron powder attached to the FL wheel speed
sensor/sensor rotor?

—

Go to Step12

Go to Step6

6

Check the RL wheel speed sensor. (Refer to
the check flow C-1-3.)

Is the RL sensor output normal?

—

Go to Step7

Go to Step9

7

Does the sensor rotor have missing tooth or
saw-toothed?

—

Go to Step13

Go to Step8

8

1. Clear the DTC.
2. Test run the vehicle, and perform the self-

diagnosis.

Is DTC displayed repeatedly?

—

Go to Step17

Go to Step16

9

Is the speed sensor damaged or saw-
toothed?

—

Go to Step14

Go to Step15

10

Adjust the preload of the wheel bearing.

Is this step completed?

—

Go to Step18

—

11

Repair or replace the speed sensor/sensor
rotor.

Is this step completed?

—

Go to Step18

—

12

Repair the speed sensor/sensor rotor.

Is this step completed?

—

Go to Step18

—

13

Replace the sensor rotor.

Is this step completed?

—

Go to Step18

—

14

Replace the RL wheel speed sensor.

Is this step completed?

—

Go to Step18

—

15

Check the RL wheel speed sensor circuit.
(Refer to the check flow B-15.)

Is this step completed?

—

Check the repair.

—

16

Check the circuit for open circuit, and the con-
nector for improper connection the EHCU
connector and the speed sensor connector.
Refer to “Intermittent trouble”.

Is this step completed?

—

Go to Step18

—

5A4-60 ABS/ASR

17

Replace the EHCU.

Is this step completed?

—

Go to Step18

—

18

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”.

Go to Step18

Step

Action

Value

YES

NO

ABS/ASR 5A4-61

DTC:C0264 (Flash Code 64) Speed Sensor Signal Fault/Wrong Tire Size; RR

Check flow B-20

Step

Action

Value

YES

NO

1

Check the tire.

Is the tire specification correct? Is abnormal
wear found in the outer surface?

—

Go to Step2

Replace with the 

specified tire with-

out wear.Go to 

Step18

2

Has certain tire been rotated alone by perfum-
ing for jack-up or roller tester?

DTC may be set if 

certain tire is 

rotated alone. Go 

to Step18

Go to Step3

3

Is the RR wheel bearing rattling?

—

Go to Step10

Go to Step4

4

Is the RR wheel speed sensor/sensor rotor
rattling?

—

Go to Step11

Go to Step5

5

Is iron powder attached to the RR wheel
speed sensor/sensor rotor?

—

Go to Step12

Go to Step6

6

Check the RR wheel speed sensor. (Refer to
the check flow C-1-4.)

Is the RR sensor output normal?

—

Go to Step7

Go to Step9

7

Does the sensor rotor have missing tooth or
saw-toothed?

—

Go to Step13

Go to Step8

8

1. Clear the DTC.
2. Test run the vehicle, and perform the self-

diagnosis.

Is DTC displayed repeatedly?

—

Go to Step17

Go to Step16

9

Is the speed sensor damaged or saw-
toothed?

—

Go to Step14

Go to Step15

10

Adjust the preload of the wheel bearing.

Is this step completed?

—

Go to Step18

—

11

Repair or replace the speed sensor/sensor
rotor.

Is this step completed?

—

Go to Step18

—

12

Repair the speed sensor/sensor rotor.

Is this step completed?

—

Go to Step18

—

13

Replace the sensor rotor.

Is this step completed?

—

Go to Step18

—

14

Replace the RR wheel speed sensor.

Is this step completed?

—

Go to Step18

—

15

Check the RR wheel speed sensor circuit.
(Refer to the check flow B-16.)

Is this step completed?

—

Check the repair.

—

16

Check the circuit for open circuit, and the con-
nector for improper connection the EHCU
connector and the speed sensor connector.
Refer to “Intermittent trouble”.

Is this step completed?

—

Go to Step18

—