Isuzu N-Series. Service manual - part 266

Repair the short circuit and improper connec-
tion in J-177 connector terminal 18.

Measure the voltage between the J-177 con-
nector terminal 18 and 1,23.

Is the voltage within the specified value?

0.5 — 4.5V

1. Install all the components, and check that

those are installed properly.

2. Clear the DTC.
3. With Tech 2:

• Connect the J-177 connector of the

EHCU.
Check the model type code.

Is this step completed?

—

Go to “Diagnostic

basic flow”.

Replace the EHCU with a new one.

Is this step completed?

—

Go to “Diagnostic

basic flow”.

ABS/ASR 5A4-39

Model Type Identification by Control Unit

EHCU (ABS control unit) is exclusively installed for each
vehicle type, based the drive system, brake type, tire,
etc. Also, you can use the warning lamp blinking pattern
to identify the type of control unit (for which vehicle
type).

How to Indicate Model Type Identification Re-
sult

With the ignition switch OFF, short the terminal 12 with
the terminal 4 or 5 (ground) of the self-diagnosis con-
nector, and depress the brake pedal and then turn the
starter switch to ON. The ABS warning lamp will blink to
indicate the result.

1.2

0.4

OFF

OPEN

GND

Ignition switch

Diagnosis connector

Brake switch

Warning lamp
(Raised floor model)

Unit: sec

Approx.

3.2 sec

Vehicle model identification code: 1

0.4

N5A2036E

Model type

identification

code

2WD ABS

Raised floor model with front

wheel disc brake

Flat low model with front wheel

disc brake

Raised floor model with four

wheel drum brake

NQR model for EC

NQR model for Australia

5A4-40 ABS/ASR

DTC:C0214 (Flash Code 14) EHCU Fault

Check flow B-3

Step

Action

Value

YES

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Check for continuity between the J-177

connector terminal 1,23 and the body
ground.

Is there continuity?

—

Go to Step2

1. Connect the connector of the EHCU.
2. Clear the DTC.
3. Perform the self-diagnosis after turning

the starter switch from OFF to ON.

Is DTC displayed repeatedly?

—

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

Is this step completed?

—

—

Replace the EHCU.

Is this step completed?

—

—

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”.

ABS/ASR 5A4-41

DTC:C0215 (Flash Code 15) ECU Power Supply Fault

Check flow B-4

Step

Action

Value

YES

Is the battery voltage normal?

—

Go to Step2

1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Start the engine.
4. Measure the voltage between the J-177

connector terminal 2 and the J-177 con-
nector terminal 1,23.

Is the value within specified value?

17 — 33.5V

Go to Step6

Look for the circuit with improper connection.

Is improper connection found?

—

Repair and perform the self-diagnosis.

Is DTC displayed repeatedly?

—

Go to Step7

Charge or replace the battery.

Is this step completed?

—

—

Repair the circuit for open/short circuit, and
the connector for improper connection
between the J-177 connector terminal 2 and
the fusible link FL-9.

Is this step completed?

—

—

Replace the control unit.

Is this step completed?

—

—

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”.