Opel Frontera UBS. Manual - part 2043

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.

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.