1995 ISUZU TROOPER Workshop Manual

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
•

CHART A-5, TA-5 I):Eet<(] I TECH 1 I
5) BRAKING SOUND (FROM HYDRAULIC UNIT) IS HEARD WHILE NOT BRAKING
IS THIS THE FIRST VEHICLE START AFTER ENGINE
START? AND IS VEHICLE SPEED UNDER 10 KM/H
(6MPH)?
WHEN
DID IT OCCUR? 1. AT THE TIME OF SHIFT DOWN OR CLUTCH OPERATION 2. AT THE TIME OF LOW J.l DRIVE (ICE OR SNOW ROAD) OR ROUGH ROAD DRIVE 3. AT THE TIME OF HIGH-SPEED TURN 4. AT THE TIME OF PASSING CURB 5. AT THE TIME OF OPERATING ELECTRICAL
EQUIPMENT SWITCHES
6. AT THE TIME OF RACING THE ENGINE (OVER
5000 RPM)
IS THERE PLAY IN EACH SENSOR/WHEEL
SPEED SENSOR RINGS?
•
CHECK HARNESS/CONNECTOR FOR SUSPECTED
DISCONNECTION
• IF NO DISCONNECTION IS FOUND,
REPLACE EBCM
IT IS SELF-CHECKING SOUND NORMAL
UNDER ANY ONE CONDITION ABOVE, ABS MAY SOMETIME BE ACTUATED EVEN WHEN BRAKE
PEDAL IS NOT APPLIED
11 = Friction Unit

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