Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 680
5A–16
BRAKE CONTROL SYSTEM
Connector List
D05RW002
5A–17
BRAKE CONTROL SYSTEM
D05RW003
5A–18
BRAKE CONTROL SYSTEM
Part Location
D08RW369
Legend
(1) F–2
(2) F–3
(3) I–9
(4) C–63
(5) H–7, H–8, H–24, H–25
(6) B–25
(7) C–16
(8) Fuse Box
(9) B–13 or B–14
(10) C–13
(11) H–10, H–11
(12) C–41
(13) H–41, H–42
(14) C–4
(15) C–85
(16) Relay & Fuse Box (X–15)
(17) H–12, H–15, H–16
(18) C–39
(19) M–1
(20) M–8
(21) H–33
(22) I–10
5A–19
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
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