Opel Frontera UBS. Service manual — part 1096
5A–57
BRAKE CONTROL SYSTEM
Unit Inspection Procedure
This section describes the following inspection
procedures referred to during “SYMPTOM DIAGNOSIS”
and “DIAGNOSIS BY ‘ABS’ WARNING LIGHT
ILLUMINATION PATTERN” :
without TECH 2
with TECH 2
Wheel Speed Sensor Output Inspection
Chart C-1-1 to C-1-4
Chart TC-1
Transmission SW Inspection
Chart C-2
Chart TC-2
Chart C-1-1 FL Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle, With all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning FL wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 20 and 21 under
200 mV?
Go to Step 2
Ok.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is resistance between connector (C-13) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit in
harness between
wheel speed
sensor connector
and EHCU.
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
3
Reconnect all components and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
5A–58
BRAKE CONTROL SYSTEM
Chart C-1-2 FR Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning FR wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 4 and 5 under 200
mV?
Go to Step 2
Ok.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is resistance between connector (C-41) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit of
harness between
wheel speed
sensor connector
and EHCU.
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
3
Reconnect all components and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
Chart C-1-3 RL Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning RL wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 22 and 23 under
200 mV?
Go to Step 2
Ok.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is resistance between connector (F-3) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit of
harness between
wheel speed
sensor connector
and EHCU.
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
3
Reconnect all components and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
5A–59
BRAKE CONTROL SYSTEM
Chart C-1-4 RR Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning RR wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 2 and 3 under 200
mV?
Go to Step 2
Ok.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is resistance between connector (F-2) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit of
harness between
wheel speed
sensor connector
and EHCU.
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
3
Reconnect all components and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
Chart TC-1 Sensor Output Inspection Procedure (Use TECH 2)
Step
Action
Yes
No
1
1. Connect TECH 2.
2. While driving the vehicle, check the wheel speed of each
sensor by Data List.
Is the vehicle speed value is normal?
Go to Step 6
Go to Step 2
2
Check the sensor harness for suspected disconnection (Check
while shaking harness/connector).
Is the sensor harness connection normal?
Replace speed
sensor.
Go to Step 3
Repair.
Go to Step 6
3
While driving the vehicle, check the wheel speed of each sensor
by Data List.
Is the vehicle speed value is normal?
Go to Step 6
Go to Step 4
4
Check the sensor rotor.
Is the sensor rotor normal?
Go to Step 6
Replace sensor
rotor.
Go to Step 5
5
While driving the vehicle, check the wheel speed of each sensor
by Data List.
Is the vehicle speed value is normal?
Go to Step 6
Repair harness or
connector
between EHCU
and speed
sensor.
Go to Step 6
6
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 6
5A–60
BRAKE CONTROL SYSTEM
Chart C-2 Transmission Input Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
Is there continuity between EHCU connector terminals 6 and 15
(Gear position-P(A/T), N(M/T))?
Shorted switch
harness.
Repair switch or
harness.
Go to Step 6
Go to Step 2
2
Is the vehicle an A/T model?
Go to Step 3
Go to Step 5
3
Turn the key on and measure voltage between EHCU connector
terminals 6 and 15.
Is there less than 6V when the gear position is L, and R(Battery
voltage 12V)?
Go to Step 5
Transmission SW
trouble.
Disconnected
harness.
Repair SW and
harness.
Go to Step 6
4
Turn the key on and measure the voltage between EHCU
connector terminal 6 and 15.
Is there more than 9.6V when the gear position is 1, 2, R(Battery
voltage 12V)?
Go to Step 5
Transmission SW
trouble.
Disconnected
harness.
Repair SW and
harness.
Go to Step 6
5
Measure the voltage between EHCU connector terminals 6 and
15.
Is there 6.6 to 9.0V when the gear position is 3, 4, 5 and N(M/T) or
2,3,D,N and P(A/T)(Battery voltage 12V)?
Go to Step 6
Transmission SW
trouble.
Disconnected
harness.
Repair SW and
harness.
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
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