brake ISUZU TROOPER 1995 Workshop Manual

4-WHEEL ANTILOCK BRAKE SYSTEM (ABSI 5A4-55
CHART B-6
BRAKE
SWITCH TROUBLE (DIAGNOSTIC TROUBLE CODE 22)
IS THE STOP LIGHT ACTUATED WHEN THE BRAKE
PEDAL IS DEPRESSED?
TURN THE KEY OFF
CONNECT PINOUT BOX
MEASURE
25 PIN TO 10 VOLTAGE AS THE
BRAKE PEDAL IS DEPRESSED
CHECK THAT PINS 10, 20, AND 34 HAVE GOOD GROUND
• CHECK HARNESS/
CONNECTOR FOR DISCONNECTION
• FAULT FOUND: REPAIR, AND PERFORM SYSTEM SELF-CHECK • NO FAULT FOUND:
REPLACE EBCM
HARNESS BETWEEN
BRAKE SWAND EBCM IS FAUL TV
• ABNORMALHARNESS IN STOP LIGHT CIRCUIT
REPAIR THE HARNESS

5A4-56 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART B-7 [)reM:{!
ABNORMAL TRANSMISSION INPUT (A/T MODEL) (DIAGNOSTIC TROUBLE CODE 23)
. 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
CONTINUITY: 0 X 0 X X NO
CONTINUITY: X
NG
NG
IN "P", "N", "D" OR "2" RANGE I
• TURN THE KEY OFF • WITH AfT CONTROLLER CONNECTOR REMOVED, CHECK 16 AND 20
CONTINUITY
~ $
. HARNESS SHORT 1· CHECK AfT I TOGND CONTROLLER
• REPAIR HARNESS
~ p ('
• , A2 .... .... ., 12 83 14 ....
2
L
X 0
!
0
-,
NG IN "R" OR "L" RANGE
I . TURN TH E KEY OFF WITH AfT CONTROLLER CONNECTOR
D, CHECK 16 AND AfT REMOVE CONTRO LLER CONNECTOR B10
CONTIN UITY
l
$
. CHECK A fT DISCONNECTED
CONTRO LLER HARNESS REPAIR HARNESS
5lrL Jl
.. .. :~~f~ IJ II
"tH-
•

5A4-58 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART B-8 I):Eeti((l
HYDRAULIC UNIT (HU) PUMP MOTOR AND MOTOR RELAY CIRCUIT ~
(DIAGNOSTIC TROUBLE CODE 32)
• WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
• MEASURE RESISTANCE BETWEEN TERMINALS 17 AND28
I 70n-9on I I OTHER THAN 70n-9on I
I
CHECK CONTINUITY BETWEEN TERMINAL 141 AND10 I MEASURE RESISTANCE BETWEEN HU CONNECTORS I C34-6 AND C34-11
I
I I I
CONTINUITY j NO CONTINUITY j 1 70(l-9ooJ I OTHER THAN 70n-9on I
I I I REMOVE HU CONNECTOR CHECK CONTINUITY I REPAIR HARNESS BB07 I I REPLACE HU I AND CHECK CONTINUITY BETWEEN HU OR BB08 BETWEEN PINOUT BOX
CONNECTOR C33-3 TERMINAL 14 AND 10 AND BODY GROUND
I
I
I CONTINUITY I NO CONTINUITY j
I I REPAIR HARNESS BB27, BB06 (OPEN) I • CHECK FOR MOTOR GROUND • FAULT FOUND: REPAIR GROUND
I • NO FAULT FOUND: REPLACE HU
NO CONTINUITY I CONTINUITY J
I MEASURE VOLTAGE REPAIR HARNESS
BETWEEN HU CONNECTOR BB06, BB27
(GND
C33-2 AND BODY GROUND SHORT)
BATTERYVOLTAGE I $
. MOTOR RELAY REPAIR FUSE/HARNESS BETWEEN I ABNORMAL BATTERY AND C33-2/CONNECTOR • REPLACE HU
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-59
CHART B-9 [JEeft:(l
SOLENOID VALVE ABNORMALITY (DIAGNOSTIC TROUBLE CODE 41,42 & 44)
• WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
• MEASURE THE FOLLOWING TERMINAL RESISTANCE
ACCORDING TO THE SPECIFIC DIAGNOSTIC TROUBLE CODE STORED:
CODE 41 (FL SOLENOID VALVE)
BETWEEN PINOUT BOX TERMINALS 2 AND 32 CODE 42 IFR SOLENOID VALVE)
BETWEEN PINOUT BOX TERMINALS 35 AND 32 CODE 44 (REAR SOLENOID VALVE)
BETWEEN PINOUT BOX 18 AND 32
I
I
I OTHER THAN 0.6-1.8n I 0.6·1.Bn I
I I
MEASURE SOLENOID VALVE RESISTANCE: . CHECK FOR FAULTS IN HARNESS BETWEEN CODE 41 (FL SOLENOID VALVE) HYDRAULIC UNIT AND EBCM
BETWEEN C34-4 AND C34-7
FAULT FOUND: REPAIR, AND PERFORM CODE 42 (FR SOLENOID VALVE) SYSTEM SELF-CHECK BETWEEN C34-3 AND C34-7 • NO FAULT FOUND: REPLACE EBCM
CODE 44 (REAR SOLENOID VALVE)
BETWEEN C34-2 AND C34-7
l
I I OTHER THAN 0.6-1.8n I o.s-1.Bn I _L I REPLACE HYDRAULIC UNITj REPAIR HARNESS OR CONNECTOR I BETWEEN HYDRAULIC UNIT AND EBCM

5A4-60 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART B-1 0 [):Ee@]
VALVE RELAY ABNORMALITY (DIAGNOSTIC TROUBLE CODE 45) ~
• WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
• MEASURE RESISTANCE BETWEEN THE TERMINALS 17 AND 27
I 1s-12oo 1 I OTHER THAN 75-1200 J
I
CHECK CONTINUITY
BETWEEN TERMINAL 32 J AND10 I_ REMOVE HU CONNECTOR AND MEASURE I RESISTANCE BETWEEN C34-6 AND C34-10
I
I
I I
CONTINUITY I
NO CONTINUITY/ I75-120n/ I OTHERS I
I I
I
MEASURE
VOLTAGE CHECK CONTINUITY I REPAIR HARNESS/ J I REPLACE HU I
BETWEEN HU HARNESS BETWEEN C34-7 AND CONNECTOR
C33-1 TO BODY GROUND C34-12 ON THE VEHICLE SIDE I
I I CONTINUITY I l NO CONTINUITY I
I I
CHECK CONTINUITY VEHICLE-SIDE
,. HU IS FAULTY J HU CONNECTOR C34-12 AND BODY • REPLACE
HU GROUND
I
I I
CONTINUITY j I NO CONTINUITY I
I I • HARNESS BB12 l REPAIR HARNESS BY02 I OPEN
• REPAIR HARNESS
I BATTERY VOLTAGE j OTHER I
I
• HU VALVE RELAY I REPAIR HARNESS /FUSE BETWEEN I TROUBLE BATTERY AND HU • REPLACE HU
~1111 .. 1 2 3 4 5 617 8 9 101112 =
•

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
•

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
•