lock ISUZU TROOPER 1995 Workshop Manual

5A3-26 REAR WHEEL ANTILOCK BRAKE SYSTEM
Continued from the previous page
REPLACE
THE EXCITER RING OF AXLE, AND RETEST
VEHICLE.
REPLACE SPEED SENSOR (THIS FAILURE MAY BE INTERMITTENT DUE TO MOISTURE CONTAMINATION, AND
CANNOT ALWAYS BE DETERMINED BY THE ABOVE RESISTANCE CHECK). Continued
from the previous page
•
REINSTALL SENSOR AND RAISE THE REAR WHEELS TO CLEAR THE FLOOR.
• START THE ENGINE, AND TURN THE WHEELS AT 5 MPH. • USING A VOLTMETER SET ON THE AC SCALE, CHECK FOR VOLTAGE AT THE TWO PINS OF THE SENSOR TEST CONNECTOR.
• RECONNECT BATIERY AND EBCM
CONNECTOR.
• RECONNECT SENSOR HARNESS TO SPEED SENSOR.
• THEN TURN IGNITION ON.
IF DEFECTS STILL EXISTS IN SYSTEM AFTER ALL PREVIOUS
STEPS, REPLACE EBCM.
EBCM
= Electronic Brake Control Module
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-27
FLASHOUT DIAGNOSTIC TROUBLE CODE 7
(ISOLATION OUTPUT MISSING OR ANTI LOCK VALVE WIRING SHORTED TO
GROUND)
Anti lock valve
Isolate.
ResetSW. 40
(EBCM)
Dump
• DISCONNECT THE ANTILOCK VALVE CONNECTOR, AND CHECK FOR RESISTANCE BETWEEN THE VALVE ISOLATION SOLENOID PIN (4) AND
THE VALVE GROUND PIN (3) IN THE VALVE CONNECTOR.
Valve
connector
CONSTANT READING OF RESISTANCE UNDER 3 OHMS
REPLACE ANTILOCK VALVE, AND RECHECK THE SELF CHECK.
CONSTANT READING OF RESISTANCE 3 TO 6 OHMS
• DISCONNECT
THE BATTERY. • DISCONNECT THE EBCM HARNESS CONNECTOR FROM EBCM, AND CHECK FOR RESISTANCE BETWEEN THE ISOLATION PIN (1) OF EBCM HARNESS CONNECTOR AND CHASSIS GROUND WHILE SHAKING THE HARNESS.
Continued on the next page
EBCM
= Electronic Brake Control Module

5A3-28 REAR WHEEL ANTILOCK BRAKE SYSTEM
Continued from the previous page
I
I CONSTANT READING OF CONSTANT READING OF I ERRATIC RESISTANCE READING. I RESISTANCE OVER 20K OHMS
RESISTANCE UNDER 20K OHMS
I CONNECT BATTERY AND EBCM REPAIR ISOLATION WIRE FOR A L REPAIR THE HARNESS. I HARNESS CONNECTOR, THEN SHORT TO GROUND BETWEEN
TURN IGNITION ON.
ANTILOCK VALVE AND EBCM, AND RECHECK THE SELF CHECK.
NO
CODE 7 INDICATED I I CODE 7 RETURNS J
I
REPLACE ANTI LOCK VALVE AND RECHECK THE SELF CHECK I AND RETEST VEHICLE. I REPLACE EBCM AND RECHECK THE SELF CHECK. I
EBCM -Electronic Brake Control Module
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-29
FLASHOUT DIAGNOSTIC TROUBLE CODE 8
(DUMP OUTPUT MISSING OR ANTILOCK VALVE WIRING SHORTED TO GROUND)
Isolate.
Reset SW.
(EBCM)
Dump
• DISCONNECT THE ANTILOCK VALVE CONNECTOR, AND CHECK FOR RESISTANCE BETWEEN THE VALVE DUMP SOLENOID PIN (1) AND THE VALVE GROUND PIN (3) IN THE VALVE CONNECTOR.
Valve
connector
CONSTANT READING OF RESISTANCE UNDER 1 OHM
REPLACE ANTILOCK VALVE, AND RECHECK THE SELF CHECK.
CONSTANT READING OF RESISTANCE 1 TO 3 OHMS
• DISCONNECT
THE BATIERY.
• DISCONNECT THE EBCM HARNESS CONNECTOR FROM EBCM, AND CHECK FOR RESISTANCE BETWEEN THE
DUMP PIN (9) OF EBCM HARNESS CONNECTOR AND CHASSIS GROUND WHILE SHAKING THE HARNESS.
Pin (9)
Continued on the
next page
EBCM
-Electronic Brake Control Module

5A3-30 REAR WHEEL ANTILOCK BRAKE SYSTEM
Continued from the previous page
I
I CONSTANT READING OF CONSTANT READING OF I ERRATIC RESISTANCE READING. I RESISTANCE OVER 20K OHMS
RESISTANCE UNDER 20K OHMS
l CONNECT BA TIERY AND
EBCM REPAIR DUMP WIRE FOR A SHORT I REPAIR THE HARNESS. J HARNESS CONNECTOR, THEN TO GROUND BETWEEN ANTILOCK TURN IGNITION ON.
VALVE AND EBCM, AND RECHECK THE SELF CHECK.
l NO CODE 81NDICATED I I CODE 8 RETURNS I
l REPLACE ANTI LOCK VALVE AND RECHECK THE SELF CHECK I I REPLACE EBCM AND RECHECK THE SELF CHECK. I AND RETEST VEHICLE.
EBCM = Electronic Brake Control Module
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-31
FLASHOUT DIAGNOSTIC TROUBLE CODE 9
(HIGH 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 OVER 2500 OHMS
REPLACE SENSOR, 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 (17) AND PIN (16) IN EBCM HARNESS CONNECTOR
WHILE SHAKING THE HARNESS.
EBCM
harness connector
ERRATIC RESISTANCE READING.
REPLACE SENSOR, RECHECK RESISTANCE READING, AND RECHECK THE SELF CHECK.
EBCM
- Electronic Brake Control Module
Continued on the next page

5A3-32 REAR WHEEL ANTILOCK BRAKE SYSTEM
Continued from the previous page
I
I CONSTANT READING OF I CONSTANT
READING OF I ERRATIC RESISTANCE READING. I RESISTANCE 1000 TO 2500 OHMS
RESISTANCE OVER 2500 OHMS
I CHECK
EBCM AND/OR SPEED I SENSOR CONNECTION. REPAIR
OPEN SENSOR
WIRES FROM EBCM TO SPEED SENSOR, I REPAIR THE HARNESS. I
CHECK FOR DIRTY OR LOOSE PIN CONNECTIONS AT ALL CONNECTORS, AND RECHECK THE SELF CHECK.
1 • RECONNECT BATIERY AND EBCM HARNESS I PROBLEM FOUND; REPAIR CONNECTION(S). I CONNECTOR.
• RECONNECT SENSOR HARNESS TO SPEED SENSOR.
• THEN TURN IGNITION ON.
1 NO CODE 9 INDICATED I CODE 9 RETURNS I
J REPLACE
SPEED SENSOR (THIS
FAILURE MAY BE l RECHECK ALL PROCEDURE STEPS. I INTERMITIENT DUE TO MOISTURE CONTAMINATION, AND
J
CANNOT ALWAYS BE DETERMINED BY THE ABOVE
RESISTANCE CHECK).
IIF DEFECTS STILL EXISTS IN SYSTEM AFTER ALL PREVIOUS I STEPS, REPLACE EBCM.
EBCM
= Electronic Brake Control Module
•

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