Opel Frontera UE. Manual - part 126

5A–50

BRAKE CONTROL SYSTEM

Chart B-22 Rear Speed Sensor Missing (DTC 63 (Flash out) / C0236, C0237 (Serial
communications))

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 (8 mph) or higher to make sure that
the warning light goes out.

Step

Action

Yes

1. Turn the key off.

2. Disconnect coil integrated module connector.

3. Measure the Rear speed sensor resistance between coil

integrated module connector (C-4) terminals 4 and 12.

Is the resistance between 1.2k and 2.0k ohms?

Go to Step 2

Go to Step 3

Is there play sensor/sensor rotor?

Repair.

Go to Step 6

Go to Step 4

Measure the rear speed sensor resistance at the sensor
connector.
Is the resistance between 1.2k and 2.0k ohms?

Repair harness

abnormality

between

sensors and

coil integrated

module.

Go to Step 6

Replace sensor.

Go to Step 6

Damage and powered iron sticking to sensor/sensor ring?

Repair.

Go to Step 6

Go to Step 5

Is sensor output normal? (Chart C-1-3 or TC-1)

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 6

Replace sensor.

Go to Step 6

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 6

BRAKE CONTROL SYSTEM

5A–51

Chart B-23 Simultaneous Drop-out of Front Speed Sensor Signal (DTC 64 (Flash out) /
C0229 (Serial communications))

Step

Action

Yes

1. Turn the key off.

2. Disconnect coil integrated module connector.

3. Measure the FL speed sensor resistance between coil

integrated module connector (C-4) terminals 2 and 10.

Is the resistance between 2.0k and 2.8k ohms?

Go to Step 2

Go to Step 3

Measure the FR speed sensor resistance between coil integrated
module connector (C-4) terminals 3 and 11.
Is the resistance between 2.0k and 2.8 k ohms?

Go to Step 5

Go to Step 4

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 2

Replace sensor.

Go to Step 2

Measure the FR 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 5

Replace sensor.

Go to Step 5

Damage and powered iron sticking to sensor/sensor ring?

Repair.

Go to Step 6

Is there play sensor/sensor rotor?

Repair.

Go to Step 7

Is sensor output normal? (Chart C-1-1&C-1-2 or TC-1)

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 8

Replace sensor.

Go to Step 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

5A–52

BRAKE CONTROL SYSTEM

Chart B-24 Wheel Speed Input Abnormality (DTC 65 (Flash out) / C0238 (Serial
communications))

Sensor Signal Abnormality Criteria using TECH 2

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

25% or more higher or lower than that of the other
wheels.

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

or more higher or lower 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 (8 mph) or higher to make sure that
the warning light goes out.
It is important to verify that the correct tires are installed
on vehicle.

Step

Action

Yes

Using TECH 2?

Go to Step 2

Go to Step 3

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).

Is there play in sensor/sensor ring?

Repair.

Go to Step 8

Go to Step 4

Is there powdered iron sticking to sensor/sensor ring?

Repair.

Go to Step 8

Go to Step 5

Is there a broken tooth or indentation in sensor ring?

Replace sensor

ring.

Go to Step 8

Go to Step 6

Is there play in wheel bearing?

Adjust or repair.

Go to Step 8

Go to Step 7

Is the check wiring between sensor and coil integrated module
normal?

Replace EHCU.

Go to Step 8

Repair, and

perform system

self-check.

Go to Step 8

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat

<FmSdata>[rsquor

]Basic diagnostic

flow chart"

Go to Step 8

BRAKE CONTROL SYSTEM

5A–53

Unit Inspection Procedure

This section describes the following inspection
procedures referred to during “SYMPTOM DIAGNOSIS"
and “DIAGNOSIS BY ‘ABS' WARNING LIGHT
ILLUMINATION PATTERN" :

Chart C-1-1 FL Sensor Output Inspection Procedure

without TECH 2

with TECH 2

Sensor Output Inspection

Chart C-1-1 to C-1-3

Chart TC-1

Step

Action

Yes

1. Turn the key off.

2. Disconnect coil integrated module connector.

3. Jack up the vehicle with all four wheels off the ground.

Measure the AC voltage between coil integrated module
connector terminals while turning FL wheel at a speed of 1
RPS:

Is the check between coil integrated module connector (C-4)
terminals 2 and 10 than under 200 mV?

Go to Step 2

OK.

Go to Step 3

1. Disconnect the wheel speed sensor.

2. Measure resistance between the wheel speed sensor

connector terminals 1 and 2.

Is the check between connector (C-13) terminals 1 and 2 within
2.0k - 2.8k ohms?

Connector is

faulty, or open

or short circuit

of harness

between wheel

speed sensor

connector and

coil integrated

module.

Inspect and

correct the

connector or

harness.

Go to Step 3

Wheel speed

sensor is faulty.

Replace the

wheel speed

sensor.

Go to Step 3

Reconnect all components, ensure all components are properly
mounted.
Was this step finished?

Repeat the “Basic

diagnostic flow

chart"

Go to Step 3

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