ISUZU TROOPER 1995 Workshop Manual

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-61
CHART B-11 [tE€f((]
SPEED SENSOR DISCONNECTION (DIAGNOSTIC TROUBLE CODE 51, 52, 53, & 54)
• WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
• MEASURE THE FOLLOWING TERMINAL RESISTANCE
ACCORDING TO THE SPECIFIC DIAGNOSTIC TROUBLE
CODE STORED
CODE
51 (FL SENSOR) BETWEEN PINOUT BOX TERMINALS 4 AND 22 CODE 52 (FR SENSOR) BETWEEN PINOUT BOX TERMINALS 21 AND 23 CODE 53 (RL SENSOR) BETWEEN PINOUT BOX TERMINALS 8 AND 9 CODE 54 (RR SENSOR) BETWEEN PINOUT BOX TERMINALS 24 AND 26
I
l I 0.8K-1.3Kn I OTHER I
l I • CHECK FOR FAULTS IN HARNESS BETWEEN MEASURE EACH SENSOR RESISTANCE AT I SPEED SENSOR AND EBCM THE SENSOR CONNECTOR
• FAULT FOUND: REPAIR, AND PERFORM I SYSTEM SELF-CHECK I I • NO FAULT FOUND: REPLACE EBCM o.BK-1.3Kn I l OTHER j
I I REPAIR HARNESS I REPLACE SENSOR I ABNORMALITY BETWEEN SENSORS AND EBCM

5A4-62 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART B-12 tJEe©]
SPEED SENSOR SHORT CIRCUIT (DIAGNOSTIC TROUBLE CODE 61, 62, 63, & 64) ~
WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
MEASURE THE FOLLOWING TERMINAL RESISTANCE
ACCORDING TO THE SPECIFIC DIAGNOSTIC TROUBLE CODE STORED:
CODE 61 (FL SENSOR) BETWEEN PINOUT BOX TERMINALS 4 AND 22 CODE 62 IFR SENSOR) BETWEEN PINOUT BOX TERMINALS 21 AND 23 CODE 63 IRL SENSOR) BETWEEN PINOUT BOX TERMINALS 8 AND 9 CODE 64 (RR SENSOR) BETWEEN PINOUT BOX TERMINALS 24 AND 26
DAMAGE
AND POWERED IRON STICKING TO SENSOR/SENSOR RING?
CHECK FOR FAULTS IN
HARNESS BETWEEN SPEED SENSOR AND EBCM
FAULT FOUND: REPAIR, AND PERFORM SYSTEM SELF-CHECK NO FAULT FOUND:
REPLACE EBCM
REPAIR HARNESS BETWEEN SENSORS AND EBCM
•

CHART B-13, TB-13 l)EeR:[I I TECH 1 I
SENSOR SIGNAL INPUT ABNORMALITY (DIAGNOSTIC TROUBLE CODE 65)
SELECT F3: SNAP SHOT MANUAL TRIGGER
WITH
WHEEL SPEED DATA DISPLAYED, RUN THE *1 VEHICLE WHEN SPEED HAS ARRIVED AT 30 KM/H
(18 MPH), PRESS F9 KEY
CHECK SPEED DATA ON EACH WHEEL (REFER TO THE CRITERIAL GIVEN BELOW)
ONLY THE ABNORMAL WHEEL SHOULD
FOLLOW THE NEXT FLOWCHART
IS THERE PLAY IN SENSOR/SENSOR ROTOR? -I)Eel{[l ALL THE WHEELS SHOULD FOLLOW THE FOLLOWING FLOWCHART
IS THERE POWDERED IRON STICKING
TO SENSOR/SENSOR ROTOR?
cill
~
Sensor Signal Abnormality Criteria using TECH 1 --------,
1) While driving, the speed of one or two wheels is 25% or more higher than that of
the other wheels.
2) The speed of one or two wheels is 10 km/h (6 mph) or more higher than that of the
other
wheels.
3) During steady driving, wheel speed changes abruptly.
* 1 The vehicle must run on a level paved road.

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-,..,
•