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