Opel Frontera UBS. Manual - part 209

5A–49

BRAKE CONTROL SYSTEM

Chart B-13 FR Dump Solenoid Valve Abnormality (DTC 44)

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

Is the EHCU connector free from damage or corrosion?

Go to Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart”.

3

1. Replace the EHCU.
2. Reconnect all component, ensure all component are properly

mounted.

Was this step finished?

Repeat the “Basic

Diagnostic Flow

Chart”.

Go to Step 3

Chart B-14 Rear Isolation Solenoid Valve Abnormality (DTC 45)

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

Is the EHCU connector free from damage or corrosion?

Go to Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart”.

3

1. Replace the EHCU.
2. Reconnect all component, ensure all component are properly

mounted.

Was this step finished?

Repeat the “Basic

Diagnostic Flow

Chart”.

Go to Step 3

Chart B-15 Rear Dump Solenoid Valve Abnormality (DTC 46)

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

Is the EHCU connector free from damage or corrosion?

Go to Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart”.

3

1. Replace the EHCU.
2. Reconnect all component, ensure all component are properly

mounted.

Was this step finished?

Repeat the “Basic

Diagnostic Flow

Chart”.

Go to Step 3

5A–50

BRAKE CONTROL SYSTEM

Chart B-16 FL Speed Sensor Disconnection (DTC 51)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure the resistance between EHCU connector terminals

20 and 21.

Is the resistance between 1.3k and 1.9k ohms?

Check for faults

in harness

between speed

sensor and

EHCU.

Fault found:

Repair, and

perform system

self-check.

No fault found:

Replace EHCU.

Go to Step 3

Go to Step 2

2

Measure the FL speed sensor resistance at the sensor connector.

Is the resistance between 1.3k and 1.9k ohms?

Repair harness

abnormality

between sensors

and EHCU.

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

Chart B-17 FR Speed Sensor Disconnection (DTC 52)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure the resistance between EHCU connector terminals 4

and 5.

Is the resistance between 1.3k and 1.9k ohms?

Check for faults

in harness

between speed

sensor and

EHCU.

Fault found:

Repair, and

perform system

self-check.

No fault found:

Replace EHCU.

Go to Step 3

Go to Step 2

2

Measure the FR speed sensor resistance at the sensor
connector.

Is the resistance between 1.3k and 1.9k ohms?

Repair harness

abnormality

between sensors

and EHCU.

Go to Step 3

Replace sensor.

Go to Step 3

3

1. Reconnect all components and 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–51

BRAKE CONTROL SYSTEM

Chart B-18 RL Speed Sensor Disconnection (DTC 53)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure the resistance between EHCU connector terminals

22 and 23.

Is the resistance between 1.3k and 1.9k ohms?

Check for faults

in harness

between speed

sensor and

EHCU.

Fault found:

Repair, and

perform system

self-check.

No fault found:

Replace EHCU.

Go to Step 3

Go to Step 2

2

Measure the RL speed sensor resistance at the sensor
connector.

Is the resistance between 1.3k and 1.9k ohms?

Repair harness

abnormality

between sensors

and EHCU.

Go to Step 3

Replace sensor.

Go to Step 3

3

1. Reconnect all components and 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-19 RR Speed Sensor Disconnection (DTC 54)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure the resistance between EHCU connector terminals 2

and 3. 

Is the resistance between 1.3K and 1.9k ohms?

Check for faults

in harness

between speed

sensor and

EHCU.

Fault found:

Repair, and

perform system

self-check.

No fault found:

Replace EHCU.

Go to Step 3.

Go to Step 2

2

Measure the RR speed sensor resistance at the sensor
connector.

Is the sensor resistance between 1.3k and 1.9k ohms?

Repair harness

abnormality

between sensors

and EHCU.

Go to Step 3

Replace sensor.

Go to Step 3

3

1. Reconnect all components and 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–52

BRAKE CONTROL SYSTEM

Chart B-20 FL Speed Sensor Short Circuit (DTC 61)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector
3. Measure the FL speed sensor resistance between EHCU

connector terminals 20 and 21.

Is the resistance between 1.3k and 1.9k ohms?

Go to Step 2

Go to Step 3

2

Is there play in the sensor/sensor rotor?

Go to Step 4

Repair.

Go to Step 6

3

Measure the FL speed sensor resistance at the sensor connector.

Is the resistance between 1.3k and 1.9k ohms?

Repair harness

abnormality

between sensors

and EHCU.

Go to Step 6

Replace sensor.

Go to Step 6

4

Damage and powdered iron sticking to sensor/sensor ring?

Go to Step 5

Repair.

Go to Step 6

5

Is sensor output normal? (Chart C-1-1 or TC-1)

Check for faults

in harness

between speed

sensor and

EHCU.

Fault found:

repair, and

perform system

self-check.

No fault found:

replace EHCU.

Go to Step 6

Replace sensor.

Go to Step 6

6

1. Reconnect all components and ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 6

NOTE: Even after repairing the faulty part the warning
light (W/L) does not go out if the vehicle is at a stop. Turn
the ignition switch to the ON position and drive the vehicle
at 12 km/h or higher to make sure that the warning light
goes out.