wheel ISUZU TROOPER 1995 Workshop Manual

5A4 -64 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
UNIT INSPECTION PROCEDURE
This section describes the following inspection procedures referred to during "SYMPTOM DIAGNOSIS" and
"DIAGNOSIS BY 'ABS' WARNING LIGHT ILLUMINATION PATTERN":
without TECH 1 with TECH 1
G-sensor
Unit Inspection Chart C-1 -
Sensor Output Inspection Chart C-2 Chart TC-2
Transfer
SW Inspection Chart C-3 Chart TC-3
Transmission
SW Inspection Chart C-4 Chart TC-4
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-65
CHART C-1
G-SENSOR UNIT INSPECTION PROCEDURE
REMOVE G-SENSOR FROM THE VEHICLE
• DISCONNECT
THE G-SENSOR CONNECTOR 825 • MEASURE RESISTANCE 8ElWEEN G-SENSOR CONNECTOR 825-1 TO 825-2 UNDER THE FOLLOWING CONDITIONS:
CONDITION
G-SENSOR
PLACED HORIZONTAL
G-SENSOR TILTED
TO 30°
OR MORE
VEHICLE ...........
FRONT
~
STANDARD G-SENSOR ON/OFF
1000 OR LESS ON
100kn OR MORE OFF
30°
OR MORE
[)EeH:(I

5A4-66 4-WHEEL ANTILOCK BRAKE SYSTEM (ASS)
CHART C-2
SENSOR
OUTPUT INSPECTION PROCEDURE
• TURN THE KEY OFF AND CONNECT PINOUT BOX
• JACK UP THE VEHICLE WITH ALL FOUR WHEELS OFF THE GROUND . MEASURE THE AC VOLTAGE BERWEEN PINOUT BOX TERMINALS
WHILE TURNING EACH WHEEL AT A SPEED OF 1 RPS:
-FLWHEEL BETWEEN TERMINALS 4 AND 22
I
-FR WHEEL
BETWEEN TERMINALS 21 AND 23
-RL WHEEL BETWEEN TERMINALS 8 AND 9
-RR WHEEL BETWEEN TERMINALS 24 AND 26
I UNDER 200 mV I OVER 200 mV J
0
DISCONNECT THE WHEEL SPEED SENSOR
• MEASURE RESISTANCE BETWEEN THE WHEEL SPEED SENSOR
CONNECTOR:
-FLWHEEL BETWEEN TERMINALS C13-1 AND C13-2 -FR WHEEL
BETWEEN TERMINALS C41-1 AND C41-2 -RLWHEEL BETWEEN TERMINALS F3-1 AND F3-2
- RRWHEEL
BETWEEN
TERMINALS F2-1 AND F2-2
I OUTSIDE 0.8K-1.3Kn I 0.8K-1.3KO j
I • WHEEL SPEED SENSOR IS FAULTY I CONNECTOR IS FAUL TV. OR OPEN OR • REPLACE THE WHEEL SPEED SENSOR SHORT
CIRCUIT OF HARNESS BETWEEN
WHEEL SPEED SENSOR CONNECTOR ANDEBCM
I
INSPECT AND CORRECT THE CONNECTOR I OR HARNESS
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-67
CHARTTC-2
SENSOR OUTPUT INSPECTION PROCEDURE
CHECK THE MINIMUM SPEED OF EACH SENSOR BY MODE F6: WHEEL SENSORS (REFER TOP. 5A4-31)
REPLACE
WITH NEW SENSORS AND RECHECK SENSOR OUTPUT CONDITIONS BY MODE F6: WHEEL SENSORS
CHECK THE
SENSOR HARNESS FOR SUSPECTED
DISCONNECTION (CHECK WHILE SHAKING HARNESS/CONNECTOR)
REPLACE
WITH NEW SENSOR ROTOR AND CHECK ONCE AGAIN THE OUTPUT CONDITIONS OF SENSORS WITH MODE F6: WHEEL SENSORS
I TECH 1 I

5A4-68 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART C-3 [@f((l
4WD SWITCH INSPECTION PROCEDURE
WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
I TURN THE KEY ON I
MEASURE THE VOLTAGE BETWEEN THE TERMINALS 15 AND 20 IN THE FOLLOWING T/F LEVER POSITIONS:
T!F LEVER POSITION STANDARD VOLTAGE
2H 12V
4H ov
4L ov
l OTHER THAN STANDARD j AS STANDARD I
clJ
CHECK CONTINUITY BETWEEN 4WD SW CONNECTOR M11-1 AND M12-1
I
2H
I
NO CONTINUITY
I 4L, 4H CONTINUITY
$ $
REPLACE 4WD sw I REPAIR CONNECTOR OR HARNESS BETWEEN CONNECTOR C4-15 AND C16-3
Ill

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-69
CHARTTC-3
4WD
SWITCH INSPECTION PROCEDURE
CHECK CONTINUITY BElWEEN 4WD SW CONNECTOR M11-1 AND M12-1
2H
4L,4H
NO CONTINUITY
CONTINUITY
REPAIR CONNECTOR
OR HARNESS BElWEEN CONNECTOR C4-15 AND C16-3
I TECH 1 I

5A4-70 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART C-4
TRANSMISSION INPUT INSPECTION
PROCEDURE (A/T MODEL)
. TURN THE KEY OFF, CONNECT THE PINOUT BOX . TURN THE KEY ON
• CHECK CONTINUITY BETWEEN THE PINOUT BOX TERMINAL 16 AND 20
SHIFT POSITION
p R N
D 2 L
CONTINUITY: 0 X 0 X
X X 0 NO CONTINUITY: X
$
@
I NG IN ·p·, ·w, "D" OR ·2· RANGE j I NG IN "R" OR "L" RANGE I
I • TURN
THE KEY OFF ! • TURN THE KEY OFF . WITH A!T CONTROLLER CONNECTOR
1.
WITH AfT CONTROLLER
CONNECTOR
REMOVED, CHECK 16 AND 20 REMOVED,
CHECK 16 AND A!T CONTINUITY CONTROLLER CONNECTOR B10 I CONTINUITY
I
~ $ $ $
. HARNESS SHORT I" CHECKA/T I I" CHECK AfT I
•
DISCONNECTED TOGND CONTROLLER
CONTROLLER HARNESS
• REPAIR HARNESS
• REPAIR HARNESS
r--I
p I In_ -,
A1 A2 .... .... ., .. .. ... A11 A12 81 12 13 .... .,. 19 810 111817
...:....:.r-,..,
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4 -71
CHART C-4 [JEefl:(l
TRANSMISSION INPUT INSPECTION PROCEDURE (M/T MODEL)
• WITH THE KEY TURNED OFF, CONNECT PINOUT BOX AND EBCM • CHECK CONTINUITY BETWEEN THE TERMINAL 16 AND 20 (GEAR POSITION-N)
I
I I
NO
CONTINUITY I I CONTINUITY I
I I
WHIT KEY ON, MEASURE
THE VOLTAGE BETWEEN 16 AND I . sw OR HARNESS SHORT TO GND I
20 AS FOLLOWS: •
REPAIR SW OR HARNESS
I SHIFT POSITIONS I 1, 2, R I OTHER POSITIONS I
I
VOLTAGE I 11.5-14.5V I ov I
I
I I
OTHER THAN SPECIFIED I
I AS SPECIFIED I
I @ . T/M SW IS FAULTY • DISCONNECTED HARNESS • REPAIR SW OR HARNESS

5A4-72 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHARTTC-4 I TECH 1 I
TRANSMISSION INPUT INSPECTION PROCEDURE
I CONNECT TECH , I
I
I SELECT MODE FO: DATA LIST I
MIT J AfT
I I
SHIFT POSITION
DISPLAY SHIFT POSITION DISPLAY
1,
2, R OFF-ROAD INPUT CLOSED L, R OFF-ROAD
INPUT CLOSED
3, 4, 5, N
OFF-ROAD INPUT OPEN OTHER THAN ABOVE OFF-ROAD
INPUT OPEN
SHIFT GEAR AND MAKE SURE OF THE ABOVE OPERATE THE LEVER AND MAKE SURE OF THE ABOVE
I I
ciJ $ $ ciJ
ABNORMAL T/M SW, INHIBITOR SW, OR HARNESS
• REPAIR T/M SW, INHIBITOR SW, OR HARNESS
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-73
ON-VEHICLE SERVICE
W CAUTION:
~ Replace all components included in repair kits used to service this system. Lubricate rubber parts with
clean, fresh brake fluid to ease assembly. Do not use shop air with in-line lubricators on brake parts,
as
damage to rubber components may result. If any hydraulic component is removed or brake line
disconnected,
it may be necessary to bleed part or all of the brake system.
NOTE:
The use of rubber hoses or parts other than those furnished specifically for the Anti lock Brake System may
lead to functional problems requiring major overhaul.
HYDRAULIC UNIT
5 (Located at the back
of the front fender) Removal
steps
1. Harness connector 2. Battery mounting bar 3. Brake pipes 4. Ground cable bolt 5. Bracket fixing bolt and nut 6. Bracket 7. Hydraulic unit fixing nuts 8. Hydraulic unit
Installation steps To install, follow the removal
steps in the reverse order.
1••1 REMOVAL
Fig. 5A4-15
I••IINSTALLATION
1. Harness connector
2. Battery mounting bar
3. Brake pipes
• After disconnecting brake pipe, cap or tape
the
openings of the brake pipe to prevent the
entry of foreign matter.
4. Ground cable bolt
5. Bracket fixing bolt and nut
6. Bracket
7. Hydraulic unit fixing nuts
8. Hydraulic unit
To install, follow the removal steps in the reverse
order,
noting the following points:
Torque
N·m Ob·ftl
Hydraulic unit fixing nuts 22 (16)
Bracket fixing bolt 24 (17)
Ground cable 14 (10)
Brake pipe (joint bolts) 16 (12)
• After installing the hydraulic unit, bleed brakes
completely.
See Section 5A "Hydraulic Brakes".