Opel Frontera UBS. Service manual — part 1090
5A–33
BRAKE CONTROL SYSTEM
5A–34
BRAKE CONTROL SYSTEM
Part Location (RHD model)
D08RW623
Legend
(1) F–2
(2) F–3
(3) H–33
(4) H–7
(5) H–46
(6) C–16
(7) E–42, E–43, M–8
(8) E–47, E–48, M–1
(9) B–13 or B–14
(10) C–13
(11) H–4, H–5, H–6
(12) H–10, H–11
(13) E–4 (4JX1)
(14) E–30 (4GJ2, 6VD1/6VE1)
(15) Fuse Box
(16) H–42
(17) C–41
(18) C–85
(19) C–4 (EHCU)
(20) Relay & Fuse Box
(21) C–39
(22) H–13, H–15, H–16, H–26, H–27
(23) I–10
(24) I–9
(25) H–12
(26) C–63
(27) B–25
5A–35
BRAKE CONTROL SYSTEM
Symptom Diagnosis
The symptoms that cannot be indicated by the warning
light can be divided in the following five categories:
1. ABS works frequently but vehicle does not
decelerate.
2. Uneven braking occurs while ABS works.
3. The wheels lock during braking.
4. Brake pedal feel is abnormal.
5. Braking sound (from EHCU) is heard while not
braking.
These are all attributable to problems which cannot be de-
tected by EHCU self-diagnosis. Use the customer com-
plaint and a test to determine which symptom is present.
Then follow the appropriate flow chart listed below.
No
Symptom
Diagnostic Flow Charts
No.
Sym tom
Without TECH 2
With TECH 2
1
ABS works frequently but vehicle does not decelerate.
Chart A–1
Chart TA–1
2
Uneven braking occurs while ABS works.
Chart A–2
—
3
The wheels are locked.
Chart A–3
Chart TA–3
4
Brake pedal feel is abnormal.
Chart A–4
—
5
Braking sound (from EHCU) is heard while not braking.
Chart A–5
Chart TA–5
Chart A–1 ABS Works Frequently But Vehicle Does Not Decelerate
Step
Action
Yes
No
1
1. Turn key off.
2. G Sensor connector and EHCU connector disconnected.
Is there continuity between EHCU terminals 26 and 8?
Go to Step 2
Go to Step 3
2
Connect EHCU connector.
Is there continuity between the G sensor and the EHCU?
Go to Step 3
Repair circuit.
Go to Step 1
3
Is the G sensor normal? (Refer to chart B-5)
Go to Step 4
Replace G
sensor.
Go to Step 11
4
Is braking force distribution normal between the front and rear of
the vehicle?
Go to Step 5
Repair brake
parts.
Go to Step 11
5
Are axle parts installed normally?
Go to Step 6
Repair axle parts.
Go to Step 11
6
Is there play in each wheel speed sensor?
Repair wheel
speed sensor.
Go to Step 11
Go to Step 7
7
Is there damage, or powered iron sticking to each wheel speed
sensor/sensor ring?
Replace sensor
or sensor ring.
Go to Step 11
Go to Step 8
8
Is the output of each wheel speed sensor normal? (Refer to chart
C-1 or TC-1)
Go to Step 9
Replace wheel
speed sensor or
repair harness.
Go to Step 11
9
Is the input of transmission normal? (Refer to chart C-2 or TC-2)
Go to Step 10
Replace switch or
repair harness.
Go to Step 11
5A–36
BRAKE CONTROL SYSTEM
Step
No
Yes
Action
10
Is the input of 4WD controller normal?
Go to Step 11
Replace
controller or
repair harness.
Go to Step 11
11
Reconnect all components and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 11
Chart TA-1 ABS Works Frequently But Vehicle Does Not Decelerate (Use TECH 2)
Step
Action
Yes
No
1
1. Connect TECH 2.
2. Make sure of the output conditions of each wheel speed
sensor by mode “F1: Data Display”.
Is the output of each sensor normal?
Go to Step 2
Replace wheel
speed sensor.
Go to Step 3
2
Return to Chart A-1.
Was the Chart A-1 finished?
Go to Step 3
Go to Step 2
3
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
Chart A-2 Uneven Braking Occurs While ABS Works
Step
Action
Yes
No
1
Is there play in each sensor?
Repair.
Go to Step 5
Go to Step 2
2
Is there damage or powdered iron sticking to each sensor/sensor
ring?
Repair.
Go to Step 5
Go to Step 3
3
Is the output of each sensor normal? (Refer to chart C-1 or TC-1)
Go to Step 4
Replace sensor
or repair harness.
Go to Step 5
4
Is brake pipe connecting order correct?
Replace EHCU.
Go to Step 5
Reconnect brake
pipe correctly.
Go to Step 5
5
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 5
Chart A-3, TA-3 The Wheels Are Locked
Step
Action
Yes
No
1
Is ABS working?
Go to Step 2
Go to Step 6
2
Is vehicle speed under 10 km/h (6mph)?
Normal.
Go to Step 3
3
Is sensor output normal? (Chart C-1 or TC-1)
Go to Step 4
Replace sensor
or repair harness.
Go to Step 9
4
Is transmission input normal? (Chart C-2 or TC-2)
Go to Step 5
Replace SW or
repair harness.
Go to Step 9
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