lock ISUZU TROOPER 1995 Workshop Manual

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-35
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5A4-36 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
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B
B
~IP-1oiB BODY ENG. FRAME
EBCM(16i
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FENDER-RH II C-39 1----------------------------------
Fig. 5A4-12
UPSHIFT INDICATOR (METER I
•

5A4-38 4-WHEEL ANTI LOCK BRAKE SYSTEM (ABS)
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 hydraulic unit) is heard while not braking.
These are
all attributable to problems which cannot be detected by EBCM's self-diagnosis. Use the
customer complaint and a test to determine which symptom is present. Then follow the appropriate flow
chart listed below.
Diagnostic Flow Charts
No. Symptom Without TECH 1 With TECH 1
1
ABS works frequently but vehicles does not Chart A-1 Chart TA-1
decelerate.
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 hydraulic unit) is heard while Chart A-5 Chart
TA-5 not braking.
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-39
CHART A-1 [):Eeft:j]
1) ABS WORKS FREOUENTL V BUT VEHICLE DOES NOT DECELERATE
PUT KEY OFF AND CONNECT PINOUT BOX.
WITH G SENSOR CONNECTOR DISCONNECTED,
CHECK CONTINUITY BETWEEN THE TERMINALS 1 AND 13
CHECK G SENSOR SINGLY (REFER TO CHART C-1)
IS THERE DAMAGE, OR POWDERED IRON STICKING
TO EACH WHEEL SPEED SENSOR/SENSOR RING?
IS
THE OUTPUT OF EACH WHEEL SPEED SENSOR
NORMAL?
(REFER TO CHART C-2)
• HARNESS BB04, BB16, BB17 ARE SHORTED
• REPAIR THE HARNESSES
REPLACE WHEEL SPEED
SENSOR OR REPAIR HARNESS

5A4-40 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART TA-1 I TECH 1 I
1) ABS WORKS FREOUENTL Y BUT VEHICLE DOES NOT DECELERATE ~
CONNECT TECH 1 I
I
MODE F6: WHEEL SENSORS MAKES SURE OF THE OUTPUT CONDITIONS OF EACH SENSOR
I
RETURN TO CHART A-1 I I REPLACE WHEEL SPEED SENSOR I
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-41
CHART A-2
2) UNEVEN BRAKING OCCURS WHILE ABS WORKS

5A4-42 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART TA-2 I TECH 1 I
2) UNEVEN BRAKING OCCURS WHILE ABS WORKS
MAKE SURE OF THE OUTPUT CONDITIONS OF EACH SENSOR FOLLOWING THE PROCEDURE
DESCRIBED ON PAGE 5A4-31
REPAIR AND CHECK THE WHEEL SPEED
SENSOR (REFER TO CHART B-13, TB-13, C-2)
•

4-WHEEL ANTI LOCK BRAKE SYSTEM (ABS) 5A4-43
CHART A-3, TA-3 [)jeK:(I I TECH 1 I
3) THE WHEELS ARE LOCKED

5A4-44 4-WHEEL ANTILOCK BRAKE SYSTEM (ASS)
CHART A-4
4) BRAKE PEDAL
FEEL IS ABNORMAL
IS THE STOP LIGHT ACTUATED WHEN
THE BRAKE PEDAL IS DEPRESSED?
TURN THE
IGNITION SWITCH OFF.
CONNECT PINOUT BOX
MEASURE VOLTAGE BETWEEN PINOUT BOX TERMINAL 25 TO 10 WHEN
BRAKE PEDAL IS DEPRESSED
MEASURE CONTINUITY BETWEEN PINOUT BOX
TERMINALS 10, 20, AND 34 TO BODY GROUND
CHECK HARNESS/
CONNECTOR
FOR SUS­PENDED DISCONNECTION
HYDRAULIC SYSTEM
LEAKAGE OR AIR ENTRY (REFER TO SECTION 5A-2
"BRAKE FLUID LEAKS") HARNESS
NG
BETWEEN BRAKE
SWANDEBCM
•

5A4-46 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
DIAGNOSIS BY II ABS,
WARNING LIGHT ILLUMINATION PATTERN
In the event that there is abnormality in the "ASS" warning light illumination pattern while the key is in the ON
position or if the warning light is actuated during driving, trouble should be diagnosed on a illumination pattern
basis as
follows:
No.
Condition "ABS" Warning Diagnostic Chart
Light Illumination Pattern
1 Warning light is ON Normal Warning I I actuated normally light OFF ' , Still not lit during
Starter ON : driving
sw OFF
2 Warning light is
Warning ON Warning light lighting
not lit light OFF circuit trouble
ON .... to CHART 8-1
Starter I sw OFF
3 Warning light blinks Warning ON Warning light lighting
twice light OFF circuit trouble
:
ON ... to CHART
B-2
Starter
sw OFF
4 Warning light ON Diagnostic trouble codes Warning J remains ON light OFF are
stored.
Display diagnostic trouble ' codes and diagnose on a
Starter
ON I code basis according to
sw OFF the flow charts.
5 Warning light is ON~ Warning actuated while light OFF driving During driving
ONr(l Starter
sw OFF