Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1179

BRAKE CONTROL SYSTEM

5A–45

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

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

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

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

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–46

BRAKE CONTROL SYSTEM

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

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

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-4) terminals 2 and 10.

Is the resistance between 2.0k and 2.8k ohms?(2WD model) 
Is the resistance between 0.7k and 1.5k ohms?(4WD model)

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?(2WD model) 
Is the resistance between 0.7k and 1.5k ohms?(4WD model)

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

BRAKE CONTROL SYSTEM

5A–47

Chart B-18 FR Speed Sensor Open or Shorted (DTC 52 (Flash out) / C0221 (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-4) terminals 3 and 11.

Is the resistance between 2.0k and 2.8k ohms?(2WD model) 
Is the resistance between 0.7k and 1.5k ohms?(4WD model)

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 FR speed sensor resistance at the sensor
connector.
Is the resistance between 2.0k and 2.8k ohms?(2WD model) 
Is the resistance between 0.7k and 1.5k ohms?(4WD model)

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

5A–48

BRAKE CONTROL SYSTEM

Chart B-19 Rear Speed Sensor Open or Shorted (DTC 53 (Flash out) / C0235 (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-4) terminals 4 and 12.

Is the resistance between 1.0k and 1.7k 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 EHCU.

Go to Step 3

Go to Step 2

2 

Measure the Rear speed sensor resistance at the sensor
connector.
Is the resistance between 1.0k and 1.7k 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