Opel Frontera UE. Manual - part 729

BRAKE CONTROL SYSTEM

5A–47

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 1.2k and 2.0k 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 1.2k and 2.0k 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

5A–48

BRAKE CONTROL SYSTEM

Chart B-20 FL Speed Sensor Missing (DTC 61 (Flash out) / C0226, C0227 (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

No

1 

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

2 

Is there play sensor/sensor rotor?

Repair.

Go to Step 6

Go to Step 4

3 

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 6

Replace sensor.

Go to Step 6

4 

Damage and powered iron sticking to sensor/sensor ring?

Repair.

Go to Step 6

Go to Step 5

5 

Is sensor output normal? (Chart C-1-1 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

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–49

Chart B-21 FR Speed Sensor Missing (DTC 62 (Flash out) / C0222, C0223 (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

No

1 

1. Turn the key off.

2. Disconnect coil integrated module connector.

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 2.8k ohms?

Go to Step 2

Go to Step 3

2 

Is there play sensor/sensor rotor?

Repair.

Go to Step 6

Go to Step 4

3 

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 6

Replace sensor.

Go to Step 6

4 

Damage and powered iron sticking to sensor/sensor ring?

Repair.

Go to Step 6

Go to Step 5

5 

Is sensor output normal? (Chart 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 6

Replace sensor.

Go to Step 6

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

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

No

1 

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

2 

Is there play sensor/sensor rotor?

Repair.

Go to Step 6

Go to Step 4

3 

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

4 

Damage and powered iron sticking to sensor/sensor ring?

Repair.

Go to Step 6

Go to Step 5

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

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