Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1175
BRAKE CONTROL SYSTEM
5A–29
I-18
X-15
No.
Connector face
5A–30
BRAKE CONTROL SYSTEM
Part Location
D08RX107
EndOFCallout
Legend
(1) Battery
(2) Fuse & Relay Box
(3) C–36
(4) C–5
(5) C–4
(6) H–12, 14
(7) I–18
(8) Starter Switch
(9) I–1
(10) C–34
(11) F–4
(12) H–26
(13) H–25
(14) H–15
(15) C–16
(16) C–13
(17) H–5
(18) B–19
(19) E–30 (6VD1)
(20) E–28 (Y22SE)
(21) C–33
BRAKE CONTROL SYSTEM
5A–31
Symptom Diagnosis
The symptoms that cannot be indicated by 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 attributed to problems which cannot be
detected by EHCU self-diagnosis. Use the customer
complaint and test to determine which symptom is
present. Then follow the appropriate flow chart listed
below.
Chart A-1 ABS Works Frequently But Vehicle Does Not Decelerate
No.
Symptom
Diagnostic Flow Charts
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
Chart TA-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
Step
Action
Yes
No
1
Is braking force distribution normal between front and rear of
vehicle?
Go to Step 2
Repair brake
parts.
Go to Step 7
2
Are axle parts installed normally?
Go to Step 3
Repair axle
parts.
Go to Step 7
3
Is there play in each or any wheel speed sensor?
Repair wheel
speed sensor.
Go to Step 7
Go to Step 4
4
Is there damage, or powdered iron sticking to each or any wheel
speed sensor/sensor ring?
Replace or
repair sensor or
sensor ring.
Go to Step 7
Go to Step 5
5
Is the output of each wheel speed sensor normal? (Refer to chart
C-1 or TC-1)
Go to Step 6
Replace wheel
speed sensor or
repair harness.
Go to Step 7
6
Is the input of 4WD controller normal?
Go to Step 7
Replace
controller or
repair harness.
Go to Step 7
7
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 7
5A–32
BRAKE CONTROL SYSTEM
Chart TA-1 ABS Works Frequently But Vehicle Does Not Decelerate (Use TECH 2)
Chart A-2 Uneven Braking Occurs While ABS Works
Chart TA-2 Uneven Braking Occurs While ABS Works (Use TECH 2)
Step
Action
Yes
No
1
1. Connect TECH 2.
2. Make sure of the output conditions of each sensor.
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
Step
Action
Yes
No
1
Is there play in each or any sensor?
Repair.
Go to Step 5
Go to Step 2
2
Damage or powdered iron sticking to each or any 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 H/U.
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
Step
Action
Yes
No
1
1. Connect TECH 2.
2. Make sure of the output conditions of each sensor.
Is the output of each sensor normal?
Go to Step 2
Go to Step 3
2
Check piping by TECH 2 ACTUATOR TEST
Is the piping normal?
Replace EHCU.
Go to Step 4
Repair the pipe.
Go to Step 4
3
Repair and check the wheel speed sensor (Refer to chart B-20 to
B-23 , C-1 or TC-1).
Was the each chart finished?
Go to Step 4
Go to Step 3
4
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 4
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