Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 166

5A–42

BRAKE CONTROL SYSTEM

Chart B-8 2WD Controller in 4WD Vehicle Controller (DTC 13 (Flash out) / C0285 (Serial
communications)), 4WD State Input Signal Failure (DTC 24 (Flash out) / C0282 (Serial
communications))

Step

Action

Yes

No

1

Remove coil integrated module connector.

Is the coil integrated module connector (C-6) terminal 8 line
normally?

Go to 

Step 2

Repair.

Go to 

Step 3

2

Is the TOD control unit normally?

Replace EHCU.

Go to 

Step 3

Replace TOD

control unit.

Go to 

Step 3

3

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

Chart B-9 Pump Motor Failure (DTC 32 (Flash out) / C0267, C0268 (Serial
communications))

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Measure the voltage between terminal 1 of the coil integrated

module connector (C-5) and body ground.

Is the voltage equal to the battery voltage?

Go to 

Step 2

Repair

fuse/harness

between battery

and coil

integrated

module connector

(C-5) terminal 1.

Go to 

Step 5

2

Is the harness from the hydraulic unit connected to the coil
integrated module connector?

Go to 

Step 3

Connect to the

connector.

Go to 

Step 3

3

Is the hydraulic unit harness in good condition?

Go to 

Step 4

Replace EHCU.

Go to 

Step 5

4

Is the resistance of hydraulic unit connector terminals 1 and 2
between 0.2 and 1.0 ohms?

Replace EHCU.

Go to 

Step 5

Replace EHCU.

Go to 

Step 5

5

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 5

5A–43

BRAKE CONTROL SYSTEM

Chart B-10 EHCU Valve Relay Failure (DTC 35 (Flash out) / C0265, C0266 (Serial
communications))

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Measure the voltage between terminal 1 of the coil integrated

module connector (C-5) and body ground.

Is the voltage equal to the battery voltage?

Replace EHCU.

Go to 

Step 2

Repair fuse and

harness between

coil integrated

module connector

(C-5) terminal 1

and battery.

Go to 

Step 2

2

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 2

Chart B-11 FL Isolation Solenoid Coil Failure (DTC 41 (Flash out) / C0245, C0247 (Serial
communications))

Step

Action

Yes

No

1

Was the “EHCU Connector Pin–out Checks” performed?

Go to 

Step 2

Go to 

“EHCU

Connector

Pin–out Checks.”

2

1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the

EHCU.

3. Inspect the connector for damage or corrosion.

Is the connector free from damage or corrosion?

Go to 

Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart.”

3

1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are

properly mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

Chart B-12 FL Dump Solenoid Coil Failure (DTC 42 (Flash out) / C0246, C0248 (Serial
communications))

Step

Action

Yes

No

1

Was the “EHCU Connector Pin–out Checks” performed?

Go to 

Step 2

Go to 

“EHCU

Connector

Pin–out Checks.”

2

1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the

EHCU.

3. Inspect the connector for damage or corrosion.

Is the connector free from damage or corrosion?

Go to 

Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart.”

3

1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are

properly mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

5A–44

BRAKE CONTROL SYSTEM

Chart B-13 FR Isolation Solenoid Coil Failure (DTC 43 (Flash out) / C0241, C0243 (Serial
communications))

Step

Action

Yes

No

1

Was the “EHCU Connector Pin–out Checks” performed?

Go to 

Step 2

Go to 

“EHCU

Connector

Pin–out Checks.”

2

1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the

EHCU.

3. Inspect the connector for damage or corrosion.

Is the connector free from damage or corrosion?

Go to 

Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart.”

3

1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are

properly mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

Chart B-14 FR Dump Solenoid Coil Failure (DTC 44(Flash out) / C0242, C0244 (Serial
communications))

Step

Action

Yes

No

1

Was the “EHCU Connector Pin–out Checks” performed?

Go to 

Step 2

Go to 

“EHCU

Connector

Pin–out Checks.”

2

1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the

EHCU.

3. Inspect the connector for damage or corrosion.

Is the connector free from damage or corrosion?

Go to 

Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart.”

3

1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are

properly mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

Chart B-15 Rear Isolation Solenoid Coil Failure (DTC 45 (Flash out) / C0251, C0253 (Serial
communications))

Step

Action

Yes

No

1

Was the “EHCU Connector Pin–out Checks” performed?

Go to 

Step 2

Go to 

“EHCU

Connector

Pin–out Checks.”

2

1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the

EHCU.

3. Inspect the connector for damage or corrosion.

Is the connector free from damage or corrosion?

Go to 

Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart.”

3

1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are

properly mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

5A–45

BRAKE CONTROL SYSTEM

Chart B-16 Rear Dump Solenoid Coil Failure (DTC 46 (Flash out) / C0252, C0254 (Serial
communications))

Step

Action

Yes

No

1

Was the “EHCU Connector Pin–out Checks” performed?

Go to 

Step 2

Go to 

“EHCU

Connector

Pin–out Checks.”

2

1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the

EHCU.

3. Inspect the connector for damage or corrosion.

Is the connector free from damage or corrosion?

Go to 

Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart.”

3

1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are

properly mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3

Chart B-17 FL Speed Sensor Open or Shorted (DTC 51 (Flash out) / C0225 (Serial
communications))

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Measure the resistance between coil integrated module

connector (C-6) terminals 2 and 10.

Is the resistance between 2.0k and 2.8k ohms?

Check for faults

in harness

between speed

sensor and coil

integrated

module.

Fault found:

Repair, and

perform system

self-check.

No fault found:

Replace coil

integrated

module.

Go to 

Step 3

Go to 

Step 2

2

Measure the FL speed sensor resistance at the sensor connector.

Is the resistance between 2.0k and 2.8k ohms?

Repair harness

abnormality

between sensors

and coil

integrated

module.

Go to 

Step 3

Replace sensor.

Go to 

Step 3

3

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to 

Step 3