Opel Frontera UBS. Service 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.
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