Opel Frontera UBS. Service manual — part 1095

5A–53

BRAKE CONTROL SYSTEM

Chart B-21 FR Speed Sensor Short Circuit (DTC 62)

Step

Action

Yes

No

1

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

connector terminals 4 and 5.

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 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 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-1-2 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 “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.

5A–54

BRAKE CONTROL SYSTEM

Chart B-22 RL Speed Sensor Short Circuit (DTC 63)

Step

Action

Yes

No

1

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

connector terminals 22 and 23.

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 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 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-1-3 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.

5A–55

BRAKE CONTROL SYSTEM

Chart B-23 RR Speed Sensor Short Circuit (DTC 64)

Step

Action

Yes

No

1

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

connector terminals 2 and 3.

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 RR 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-1-4 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 “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.

5A–56

BRAKE CONTROL SYSTEM

Chart B-24 Sensor Signal Input Abnormality (DTC 65)

Step

Action

Yes

No

1

Using TECH 2?

Go to Step 2

Go to Step 3

2

1. Connect TECH 2.
2. Select Snap shot manual trigger.
3. With wheel speed data displayed, run the vehicle when speed

has arrived at 30 km/h (18 mph).

4. Check speed data on each wheel (refer to the criterion given

below). *1

Is the abnormal sensor condition found?

Replace.

Go to Step 8

Go to Step 3

All the sensors

should follow the

following

flowchart (without

using TECH 2).

3

Is there play in sensor/sensor ring?

Repair.

Go to Step 8

Go to Step 4

4

Is there powdered iron sticking to sensor/sensor ring?

Repair.

Go to Step 8

Go to Step 5

5

Is there a broken tooth or indentation in sensor ring?

Replace sensor

ring.

Go to Step 8

Go to Step 6

6

Is there play in wheel bearing?

Adjust or repair.

Go to Step 8

Go to Step 7

7

Is the check wiring between sensor and EHCU normal?

Replace EHCU.

Go to Step 8

Repair, and

perform system

self-check.

Go to Step 8

8

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat “Basic

diagnostic flow

chart.”

Go to Step 8

Sensor Signal Abnormality Criteria using
TECH 2

1. While driving, the speed of one or two wheels 25% or

more higher than that of the other wheels.

2. The speed of one or two wheels is 10 km/h (6 mph) or

more higher than that of the other wheels.

3. During steady driving, wheel speed changes abruptly.

*1 The vehicle must run on a level paved road.

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.
It is important to verify that the correct tires are installed
on vehicle.