ABS ISUZU TROOPER 1995 Owners Manual

5A4-34 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CIRCUIT DIAGRAM
FENDER -LH
BODY· FRT
FENDER -LH
+ o-----J----'8:..:8:..:/R~
B
EJ
~~B BODY ENG. FRAME
II
11~5
II C-16
E 8 C M
Fig. 5A4-11
o.sw 8BI6
.. -d ~
DATA LINK CONNECTOR
C-4 lOA ELEC. IGN. O.Sl/W
C-10 lOA METER, GAUGE
H-24
IM/TI ------~
H-10
I I I 10
I H;lo I
4WDS1111
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-35
0.85 G/W
0.5 L/W
~ ..
"' i 0 ..
~ .. ~ iii ..
H-25
l!'/jc;_R_Uli!_E_<;_q_N_T!I9~1-___ , ' ~ ' ~ '
DJ
"' 0 ..
"' ~ 5l z ~ Ul " ..
18 3 H-24 ' 4 ~~~ '
-----------------l ;:~ "'" ~~ 0
" ... U>:::> ~ "' iii !!!1] 0 .. ~~ 0.85 G/Y
~ 3 "' CD 0 CD
BOO~ffiT llr---------------------------~~------------------------------------------~--------------~

5A4-36 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
+ o--1---=8..:8:.:.111~
B
B
~IP-1oiB BODY ENG. FRAME
EBCM(16i
0.5G/B
~1-"T=-''---'-'-'~
~ :::>
~1-L-.--.-~
FENDER-RH II C-39 1----------------------------------
Fig. 5A4-12
UPSHIFT INDICATOR (METER I
•

!! co U1 )> "" I .... w
(
EBCM
RR
ABS SPEED SENSOR
(RHl
.
RELAY:
UPSHIFT-2
""·,'-....."
M-11_
. ·r·---
..
C-39
M-12"-~.·
··..
> .. , ,·
~'
...
,
~~~~~
~.-· RELAY
& FUSE
BOX
· ••.
(FL-1,
FL-2, FL-6,
F-9~
'•
BATTERY HYDRAULIC
--+1--.-.
UNIT
C-33
--~----
C-34.
H-41
H-42
TRANSMISSION
(


~·~ rl r
( STARTER
SW
RR
ABS SPEED SENSOR
(LH)
\~· \'
-.
.
B-46
' G SENSOR
\
FUSE
BOX (C-3, C-4, C-10, C-14)
BRAKE
SW
(W/CRUISE CONTROL)
STOPLIGHT SW
(W/0
CRUISE CONTROL)
BRAKE PEDAL FRT
ABS
SPEED SENSOR
(LH)
(
"V )> ~ r-0 s 5 2
.... :e ::I: m
m r-l> 2 ~ r-0 0 ~ CCI ~ ~ m ~ Cl) -t m s: ~ ~ c.n t I w .....

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