Isuzu N-Series. Manual - part 269

5A4-50 ABS/ASR

DTC:C0245 (Flash Code 45) Solenoid Monitor Circuit Fault

Check flow B-12

Step

Action

Value

YES

NO

1

Replace the EHCU.

Is this step completed?

—

Go to Step2

Go to Step1

2

1. Install all the components, and check that

those are installed properly.

2. Clear the DTC.
3. Test run the vehicle.

Is this step completed?

—

Go to “Diagnostic 

basic flow”.

Go to Step2

ABS/ASR 5A4-51

DTC:C0251 (Flash Code 51) Speed Sensor Open/Short Circuit; FL

Check flow B-13

Step

Action

Value

YES

NO

1

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Measure the resistance between the J-

177 connector terminals 32 and 33.

Is the value within specified value?

1 — 2k

Ω

Go to Step2

Go to Step3

2

Measure the resistance between the J-177
connector terminals 32 and the ground.

Is the value within specified value?

1000k

Ω or 

more

Go to Step7

Go to Step4

3

1. Disconnect the FL wheel speed sensor

connector.

2. Measure the resistance between the J-75

connector terminals 1 and 2 (sensor
side).

Is the value within specified value?

1 — 2

Ω

Go to Step5

Go to Step6

4

1. Disconnect the FL wheel speed sensor

connector.

2. Measure the resistance between the J-75

connector terminal 1 (sensor side) and
the ground.

Is the value within specified value?

1000k

Ω or 

more

Go to Step5

Go to Step6

5

Repair the circuit for open/short circuit
between the control unit connector and the
sensor connector.

Is this step completed?

—

Go to Step8

—

6

Replace the FL wheel speed sensor.

Is this step completed?

—

Go to Step8

—

7

Replace the control unit.

Is this step completed?

—

Go to Step8

—

8

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 Step8

5A4-52 ABS/ASR

DTC:C0252 (Flash Code 52) Speed Sensor Open/Short Circuit; FR

Check flow B-14

Step

Action

Value

YES

NO

1

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Measure the resistance between the J-

177 connector terminals 10 and 11.

Is the value within specified value?

1 — 2k

Ω

Go to Step2

Go to Step3

2

Measure the resistance between the J-177
connector terminals 10 and the ground.

Is the value within specified value?

1000k

Ω or 

more

Go to Step7

Go to Step4

3

1. Disconnect the FR wheel speed sensor

connector.

2. Measure the resistance between the J-74

connector terminals 1 and 2 (sensor
side).

Is the value within specified value?

1 — 2k

Ω

Go to Step5

Go to Step6

4

1. Disconnect the FR wheel speed sensor

connector.

2. Measure the resistance between the J-74

connector terminal 1 (sensor side) and
the ground.

Is the value within specified value?

1000k

Ω or 

more

Go to Step5

Go to Step6

5

Repair the circuit for open/short circuit
between the control unit connector and the
sensor connector.

Is this step completed?

—

Go to Step8

—

6

Replace the FR control unit.

Is this step completed?

—

Go to Step8

—

7

Replace the control unit.

Is this step completed?

—

Go to Step8

—

8

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 Step8

ABS/ASR 5A4-53

DTC:C0253 (Flash Code 53) Speed Sensor Open/Short Circuit; RL

Check flow B-15

Step

Action

Value

YES

NO

1

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

and the RL wheel speed sensor connec-
tor J-149.

3. Check for continuity between the J-177

connector terminal 34 and the J-149 sen-
sor connector terminal 2.

Is there continuity?

—

Go to Step2

Go to Step7

2

Check for continuity between the J-177 con-
nector terminals 34 and 1.

Is there continuity?

—

Go to Step7

Go to Step3

3

Check for continuity between the J-177 con-
nector terminal 22 and the J-149 sensor con-
nector terminal 1.

Is there continuity?

—

Go to Step4

Go to Step7

4

Check for continuity between the J-177 con-
nector terminals 22 and 1.

Is there continuity?

—

Go to Step7

Go to Step5

5

1. Connect the connector of the EHCU.
2. Turn the starter switch ON.
3. Measure the voltage between the J-149

sensor connector terminal 1 and the
ground.

Is the value within specified value?

9 — 16V

Go to Step6

Go to Step7

6

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

Is the fail corrected?

—

Go to Step9

Go to Step8

7

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

Is this step completed?

—

Go to Step9

Go to Step7

8

Replace the control unit.

Is this step completed?

—

Go to Step9

Go to Step8

9

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 Step9