wheel ISUZU TROOPER 1995 Workshop Manual

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-33
FLASH OUT DIAGNOSTIC TROUBLE CODE 10
(LOW SENSOR RESISTANCE)
(EBCM)
Speed
sensor
Speed sensor
• DISCONNECT THE SENSOR HARNESS CONNECTOR FROM SPEED SENSOR, AND CHECK FOR RESISTANCE BETWEEN THE TWO SENSOR
PINS WHILE SHAKING THE HARNESS.
CONSTANT READING OF RESISTANCE UNDER 1000 OHMS
REPLACE SENSOR, AND RECHECK RESISTANCE READING, AND RECHECK THE SELF CHECK. CONSTANT
READING
OF RESISTANCE 1000 TO 2500 OHMS
• RECONNECT SENSOR HARNESS
CONNECTOR TO SPEED SENSOR.
• DISCONNECT BATTERY,
AND DISCONNECT EBCM HARNESS
CONNECTOR FROM EBCM, AND CHECK FOR RESISTANCE BETWEEN PIN (16) IN EBCM
HARNESS CONNECTOR AND CHASSIS GROUND WHILE
SHAKING THE HARNESS.
ERRATIC RESISTANCE READING.
REPLACE SENSOR,
RECHECK RESISTANCE READING, AND RECHECK THE SELF CHECK.
EBCM
= Electronic Brake Control Module
Continued on the next page

5A3-34 REAR WHEEL ANTILOCK BRAKE SYSTEM
CONSTANT READING OF RESISTANCE OVER 20K OHMS
REPAIR SENSOR WIRE
FOR A SHORT TO GROUND BETWEEN EBCM AND SENSOR, CHECK FOR FRAYED OR SHORTED WIRES IN THE CONNECTOR, AND RECHECK THE SELF CHECK.
Continued from the previous page
I
CONSTANT READING OF RESISTANCE UNDER 20K OHMS
• DISCONNECT
THE SENSOR
HARNESS CONNECTOR FROM
SPEED SENSOR, AND CHECK FOR RESISTANCE BETWEEN PIN (17)
AND PIN (16) IN EBCM HARNESS
CONNECTOR WHILE SHAKING
THE HARNESS.
= [',...,J-2.,..1-3..--14....,l~'l's...,, 1-6-.-17, la"'l EBCM
harness connector
l9l10111112t~ 14Jl5116117) :) Pin (17)
f f Pin (166~,~~.
!.TJ -I
~~···~
CONSTANT READING OF RESISTANCE OVER 20K OHMS
• RECONNECT
BATTERY AND EBCM HARNESS CONNECTOR.
• RECONNECT SENSOR HARNESS
TO SPEED SENSOR.
•
THEN TURN IGNITION ON.
NO
CODE 10 INDICATED CONSTANT
READING
OF I RESISTANCE UNDER 20K OHMS
REPAIR SENSOR WIRES
FOR A SHORT CIRCUIT BETWEEN THEM,
AND CHECK FOR FRAYED WIRE OF SHORTED CONNECTORS, AND RECHECK THE SELF CHECK.
I l
I ERRATIC RESISTANCE READING. I
l REPAIR THE HARNESS. I
I
ERRATIC RESISTANCE READING. I
I REPAIR THE HARNESS. I
I CODE 10 RETURNS I
I REPLACE SENSOR AND RECHECK THE SELF CHECK AND I RETEST VEHICLE. l REPLACE EBCM AND RECHECK THE SELF CHECK. I
EBCM -Electronic Brake Control Module
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-35
FLASHOUT DIAGNOSTIC TROUBLE CODE 11
(STOPLIGHT SWITCH CIRCUIT DEFECTIVE CONDITION INDICATED ONLY WHEN
DRIVING ABOVE 56 km/h (35 mph))
Main fuse Fuse C-14
BOA 15A
8
(EBCM)
Stoplight
switch Stoplights
NOTE: A false Code 11 may be set under any of the following conditions:
• If the drive presses on the brake pedal while starting the vehicle.
• If
the driver "rides" the brake pedal while driving (pressure applied to pedal without stopping the vehicle).
• If
the brake light (stoplight) bulbs are burned out or inoperative.
If Code 11 is an intermittent complaint, use the test drive to see if driver habits are causing the code to set without
any vehicle fault. Make sure the brake pedal switch is adjusted and working properly.
• REPAIR OR REPLACE STOPLIGHT SWITCH.
• CHECK FOR BLOWN STOPLIGHT FUSE OR BLOWN/ MISSING STOPLIGHT BULBS. •
DISCONNECT EBCM HARNESS CONNECTOR FROM
EBCM AND CHECK FOR VOLTAGE BETWEEN PIN (8) OF EBCM HARNESS CONNECTOR AND CHASSIS GROUND
WHILE STEPPING ON THE BRAKE PEDAL WHILE
SHAKING THE HARNESS.
Continued
on the next page
EBCM = Electronic Brake Control Module

5A3-36 REAR WHEEL ANTILOCK BRAKE SYSTEM
Continued from the previous page
I
I CONSTANT READING OF VOLTAGE I CONSTANT READING OF VOLTAGE I ERRATIC VOLTAGE READING. I OVER 9 VOLTS UNDER 9 VOLTS
I CHECK EBCM AND STOPLIGHT I REPAIR WIRE FOR OPEN CIRCUIT I REPAIR THE HARNESS. I CIRCUIT CONNECTIONS. BETWEEN STOPLIGHT SWITCH AND EBCM AND RECHECK THE SELF CHECK.
I
I NO PROBLEM EBCM AND STOPLIGHT CIRCUIT J I REPAIRCONNECTION(S),ERASETROUBLECODEANDTHEN I CONNECTIONS. RECHECK THE SELF CHECK AND RETEST VEHICLE.
I CONNECT EBCM HARNESS CONNECTOR THEN TURN I IGNITION ON.
l
I NO CODE 11 INDICATED I I CODE 11 RETURNS J
I I REFER TO NOTE ON PREVIOUS PAGE, ERRONEOUS CODE l I REPLACE EBCM AND RECHECK THE SELF CHECK. I MAY BE CAUSED BY "RIDING" THE BRAKE PEDAL.
EBCM = Electronic Brake Control Module
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-37
FLASHOUT DIAGNOSTIC TROUBLE CODE 13/14/15
(EBCM FAILURE)
• REPLACE THE EBCM AND RECHECK SELF CHECK.
EBCM -Electronic Brake Control Module

5A3-38 REAR WHEEL ANTILOCK BRAKE SYSTEM
ON-VEHICLE SERVICE ·
REAR WHEEL ANTILOCK ELECTRONIC BRAKE CONTROL MODULE (EBCM)
REPLACEMENT
3
Removal steps
1. Shift knob
2. Front console assembly
3. Lower cluster assembly
4. EBCM assembly
5. Bracket
Installation steps
To install, follow the removal steps
in the reverse order.
Fig. 5A3-9
E) REMOVAL
1.
2.
3.
4.
5.
Shift knob
Front console assembly
• To remove the front console, refer to section 10
"Body".
Lower cluster assembly
EBCM assembly
• Disconnect the EBCM connector from EBCM.
•
Remove four EBCM fixing bolts.
Bracket
• Disconnect the bracket from EBCM.
1•+1 INSTALLATION
5.
4.
Bracket
• Connect the bracket to the EBCM.
EBCM assembly
• Tighten the EBCM assembly fixing bolts to the
specified torque.
I~I_T_o_rq_u_e ____ N·_m_(lb_·i_n_) ...... 1 __ 8_(6_9_) __
3.
2.
1.
Lower cluster assembly
Front console assembly
Shift knob
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-39
ANTILOCK (ISOLATION/DUMP) VALVE REPLACEMENT
3
Removal steps
1. Harness connector
2. Brake pipe
3. Bolt
4. Antilock
valve 5. Bracket
Installation steps
To install, follow the removal
steps in the reverse order.
Fig. 5A3-10
NOTE:
The antilock valve is not serviceable. It should be
replaced when necessary.
EJ REMOVAL
1. Harness connector
2. Brake pipe
3. Bolt
4. Antilock valve
5. Bracket
1••1 INSTALLATION
To install, follow the removal steps in the reverse
order, noting the
following points;
1. Tighten the antilock valve fixing bolts to the
specified torque.
1~1 Bolt Torque N·m (lb·ft) I 24 (18)
2. Tighten the brake pipes to the specified torque.
1~1 Brake Pipe Torque N·m (lb·in) I 12 (104)
• Bleed the brake system as outlined in uHydraulic
Brakesu (Sec. 5A).

5A3-40 REAR WHEEL ANTILOCK BRAKE SYSTEM
SPEED SENSOR REPLACEMENT
Removal steps
1. Harness connector
2.
Bolt and washer
3. Speed sensor
Installation steps To install, follow the removal
steps in the reverse order.
Fig. 5A3-11
NOTE:
The speed sensor is not serviceable. It should be
replaced when necessary.
E3 REMOVAL
1. Harness connector
2. Bolt and washer
3. Speed sensor
1••1 INSTALLATION
To install, follow the removal steps in the reverse
order, noting the
following points;
1. Tighten the bolt to the specified torque.
1~1 Bolt Torque N-m {lb·ft) I 24 {18)
NOTE:
See "Rear Axle" {Sec. 48) for exciter ring service.

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-41
MAIN DATA AND SPECIFICATIONS
TORQUE SPECIFICATIONS N·m (lb·ft)
Fig. 5A3-12

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-1
SECTION 5A4
'--' 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CAUTION
All
brake attaching fasteners are an important attaching part in that they could affect performance of
vital parts and systems, and/or could result in major repair expense. They must be replaced with one
of the same part number or with an equivalent part if replacement becomes necessary. Do not use
replacement parts
of lesser quality or substitute design. Torque values must be used as specified
during reassembly to assure proper retention of these parts.
CONTENTS
General Description .................... 5A4-3
System Components ................. 5A4-3
Electronic Brake
Control Module ·
(EBCM) .......................... 5A4-3
Hydraulic Unit ...................... 5A4-3
ABS Warning Light .................. 5A4-4
Wheel
Speed Sensor ................. 5A4-4
G-Sensor
........................... 5A4-4
Normal and Antilock Braking .......... 5A4-4
Brake Pedal Travel
................... 5A4-4
Abbreviation ........................ 5A4-4
Diagnosis
............................. 5A4-5
General
Information ................. 5A4-5
ABS
System Service Precautions ....... 5A4-5
Computer System Service
Precautions
....................... 5A4-5
General Service Precautions
........... 5A4-5
Note on lntermittents ................ 5A4-6
Test Driving ABS Complaint Vehicles ... 5A4-6
II ABS11 Warning Light ................ 5A4-6
Normal Operation ................... 5A4-6
Basic
Diagnostic Flow Chart ........... 5A4-7
Basic
Inspection Procedure ............ 5A4-8
TECH 1
TOOL. ......................... 5A4-10
1. What can be done with TECH 1 ...... 5A4-10
2. How to Use TECH 1 ................ 5A4-11
3. Explanation of Modes .............. 5A4-15
Mode FO: Data List ................... 5A4-16
Mode F2: Trouble Code ............... 5A4-18
Mode F3: Snapshot .................. 5A4-19
Mode F4: Clear Code ................. 5A4-20
Mode F5: Actuator Test ............... 5A4-21
Mode F6: Wheel Sensors ............. 5A4-31
Pin-Out Checks ........................ 5A4-33
Circuit Diagram ..................... 5A4-34
Part Location ....................... 5A4-37
Symptom Diagnosis .................... 5A4-38
CHART A-1 1) ABS Works Frequently
but Vehicle does not Decelerate ...... 5A4-39
CHART TA-1 1) ABS Works Frequently
but Vehicle does not Decelerate ...... 5A4-40
CHART A-2 2) Uneven Braking Occurs
while ABS Works .................. 5A4-41
CHART TA-2 2) Uneven Braking Occurs
while ABS Works .................. 5A4-42
CHART A-3, T A-3 3) The Wheels are
Locked
........................... 5A4-43
CHART A-4 4) Brake Pedal Feel is
Abnormal ........................ 5A4-44
CHART A-5 , T A-5 5) Braking Sound
(from Hydraulic Unit) is Heard while
not Braking ....................... 5A4-45
Diagnosis by 11 ABS11 Warning Light
Illumination Pattern .................. 5A4-46
Diagnostic Trouble Codes (DTCs) ....... 5A4-47
1. How to Display and Erase DTCs ... 5A4-47
2. Diagnostic Trouble Codes ........ 5A4-49
CHART B-1 With the Key in the ON
Position (before Starting the Engine),
Warning Light (W /L) is not
•
Actuated ........................ 5A4-50
CHART B-2 II ABSII Light Flashes
Twice with Key ON ................ 5A4-51
CHART B-3 EBCM Abnormality (Diagnostic
Trouble Code 14) .................. 5A4-52
CHART B-4 Power Voltage Drop (Diagnostic
Trouble Code 15) .................. 5A4-53
CHART B-5 G-Sensor Circuit (Diagnostic
Trouble Code 21) .................. 5A4-54
CHART B-6 Brake Switch Trouble
(Diagnostic Trouble Code 22) ........ 5A4-55
CHART B-7 Abnormal Transmission Input
(A/T Modei)(Diagnostic Trouble
Code 23) ......................... 5A4-56
CHART B-7 Abnormal Transmission Input
(M/T Modei)(Diagnostic Trouble
Code 23) ......................... 5A4-57
CHART B-8 Hydraulic Unit (HU) Pump
Motor and Motor Relay Circuit
(Diagnostic Trouble Code 32) ........ 5A4-58
CHART B-9 Solenoid Valve Abnormality
(Diagnostic Trouble Code 41, 42,
& 44) ............................ 5A4-59
CHART B-10 Valve Relay Abnormality
(Diagnostic Trouble Code 45) ........ 5A4-60