brake light ISUZU TROOPER 1995 Owners Manual

8 -178 CHASSIS ELECTRICAL
ANTI-LOCK BRAKE SYSTEM (ABS)
GENERAL DESCRIPTION
The circuit consists of the starter switch, stoplight switch (vehicle w/o cruise control), brake switch (vehicle
with cruise control), hydraulic unit, electronic brake control module, wheel speed sensor, G sensor, ABS and
4WD indicator, 4WD switch and data link connector.
When the service brake is applied while in the running mode,
the EBCM (Electronic Brake Control Module)
judges
which wheel is about to lock by using the wheel rotation speed signals sent from the four ABS speed
sensors at the
front and rear wheels. And the brake fluid pressure applied to the four wheels is controlled by
a hydraulic unit to prevent the wheels from locking.
Based on the wheel rotation speed signals
input from the ABS sensor, the EBCM sends out signals to the
solenoid valve in the hydraulic unit
to increase, maintain or decrease the brake fluid pressure. The solenoid
valve uses this signal
to control the fluid pressure which is applied to the calipers of the disk brakes of the
front wheels. (The system also controls at the same time the fluid pressure applied to the rear wheels.)
• EBCM (Electronic brake control module)
The EBCM uses the signals sent from the speed sensor to control the operation of the hydraulic unit.
When any malfunction occurs in the ABS, the
EBCM activates the fail-safe fuction while turning on the
ABS warning light.
• Hydraulic unit
The hydraulic unit consists of the motor, plunger pump, solenoid valve, and fluid pressure control
valves. The exterior
of the unit has a relay box consisting of the motor relay and valve relay. Three
solenoid valves, the
two of which are provided at the front wheels and the one at the rear wheels, control
the fluid pressure
of these wheels.
• Speed sensor
The speed sensor consists of the sensor and the rotor. It sends the EBCM the AC voltage generated by
the rotation of the rotor as the vehicle speed signal. ~
• G-sensor
The G-sensor, installed inside the center console, sends out signals to the EBCM by detecting the
decelerating speed
of the vehicle.
• ABS warning light
The ABS warning light in the instrument panel, lights up when any malfunction occurs in the ABS. It also
lights up
with the starter key at the "ON" position, as a self-check.
Refer
to Section 5A4, "ANTI-LOCK BRAKE SYSTEM" for detail.
II

::!! (Q 00 I N N 00
(
EBCM
RR
ABS
SPEED
SENSOR
(RHI
RELAY:
UPSHIFT-2
C-33 C-34
(
(
STARTERSW RR
ABS
SPEED
SENSOR
ILHI
C-94 DATA
LINK
CONNECTOR
GSENSOR
FUSE
BOX
(C-3,
C-4,
C-10,
C-141
BRAKE
SW
(W/CRUISE
CONTROL)
STOPLIGHT
SW
IW/0
CRUISE
CONTROL)
FRT
ABS
SPEED
SENSOR
ILHI
~ :a -t CJ) r-0 (") ~ 0 z
(") :::t ln en (i) m r­m ~ :;g n ~ r-eo I ..a ..... CD

CHASSIS ELECTRICAL 8-185
REAR WHEEL ANTI-LOCK BRAKE SYSTEM (RWAL)
GENERAL DESCRIPTION
The circuit consists of the starter switch, stoplight switch (vehicle w/o cruise control), brake switch (vehicle
w/cruise control). RWAL controller, RWAL speed sensor, RWAL valve, brake differential switch, 4WD switch,
parking brake
SW, indicator light (RWAL, 4WD, BRAKE), and test connector.
In this system, when the service brake is applied the RWAL controller judges the wheel rotation difference
signals which have been sent from the RWAL speed sensor at the rear axle differential. The anti-lock valves
control
the brake fluid pressure which is applied to the rear wheels to prevent the wheels from locking.
When starting the engine, the RWAL indicator in the instrument panel lights up at the same time as the brake
indicator
to inform the driver that the system is operating normally. (The light goes off after two seconds.)
Refer
to Section 5A3, "RWAL (REAR WHEEL ANTI-LOCK BRAKE SYSTEM)" for detail.

::!! (Q 00 I ....., w ..,..
(
BRAKE
LIGHT
STARTER
SW
4 WD
INDICATOR
LIGHT
RWAL
WARNING
LIGHT (METER)
BRAKE
SW
(W/CRUISE
CONTROL)
STOPLIGHT
SW
(W/0
CRUISE
CONTROL)
(
C-45
JfJI:
/
I
RWAL
CONTROLLER
TRANSMISSION
4WDSW
PARKING
BRAKE
SW
(
;g ::JJ -1 en .... 0 0 ~ -0 2 N
n :I: l> en en c;; m r­m n -t :a g r­eo I ~ co .....

8-188 CHASSIS ELECTRICAL
CIRCUIT DIAGRAM
Ill Ill
+
B jP-toj~ BODY ENG. FRAME
3
FENOER-LH I I
BODY-FRT II
FRONTEND II
5W
F-9 20AABS
5W
1.25Y/G
METER
H-7
0
0 0
0
0.85 G1V
o I BRAKE SW 4 : ~ ~--~--~
~ ~ CW/CRUISE CONTROLI
12 H-7
Fig. 8-235
10 STOPLIGHT ITO PAGE 8-841
•

8-192 CHASSIS ELECTRICAL
TRANSMISSION CONTROL MODULE (TCM)
GENERAL DESCRIPTION
The circuit consists of the starter switch, TCM, mode switch, brake switch, speed sensor, kick down switch,
Power and
Winter switches, Throttle Position (TP) sensor, Engine Control Module (ECM), barometer sensor,
adapter case, main case,
warning light (CHECK TRANS, NT OIL TEMP) and indicator light (WINTER DRIVE,
POWER DRIVE).
The TCM, based on the predetermined shifting characteristics and lockup operating valve, provides the
optimum shifting control to the varying vehicle running condition. The following input signals are sent to the
TCM: select lever position from the mode switch, running mode from the POWER & WINTER switches,
throttle opening from the TP sensor, vehicle speed from the vehicle speed sensor and engine speed from the
ECM are sent to the TCM. After receiving these signals, the TCM determines the vehicle running condition,
and
it sends output signals to each solenoid to control shifting.
When the
TCC solenoid is engaged, the lockup mechanism operates.
The shift
solenoid 2.3 and 1.2/3.4 selects the shift gear position.
The force
motor controls the line pressure to improve shifting.
Also, when the TCM detects an abnormal signal from the transmission or sensor, it will cause the "CHECK
TRANS"
light on the warning box to flash in order to inform the driver of the malfunction.
Refer to section 7 A "AUTOMATIC TRANSMISSION" for details.
•

8 -200 CHASSIS ELECTRIC'Al
A/T SHIFT LOCK
GENERAL DESCRIPTION
This circuit consists of the starter switch, stoplight switch (vehicle w/o cruise control), brake switch (vehicle
w/cruise control),
shift lock controller, stoplight, backup light and mode switch.
The shift lock system is designed not
to allow the shift lever to be shifted from the "P" position to any other
position
without depressing the brake pedal while the starter switch is turned on.
The solenoid pin at the
lower portion of the shift lever retracts when the brake pedal is not depressed, thus
causing the shift lever cam
to be locked by the link lever.
INTERNAL CIRCUIT OF SHIFT LEVER
J-1 JOINT CONNECTOR
SHIFT
LOCK
SOLENOID
B-32
PARKING POSITION
DETECTING SW
ILLUMINATION LIGHT
Fig. 8-243
SHIFT LOCK PARKING
SOLENOID POSITION
DETECTING
sw
JOINT CONNECTOR
CONTROLLER
SIDE
•

"T1 ce· 00 I N ~ ~
(
BRAKE
SW
(W/CRUISE
CONTROL)
STOPLIGHT
SW
(W/0
CRUISE CONTROL)
SHIFT
LEVER
" ""'
SHIFT
LOCK
CONTROLLER
""''
RELAY
& FUSE
BOX
(FL-1,
FL-2)

(
STARTERSW
BRAKE
PEDAL
STOP
LIGHT
(LH)
\R-7 "-TRAILER
HARNESS
CONNECTOR
(H-44)
(
;g ~ r-0 0 ~ 5 z
0 :J: ~ en u; m r­m ~ :a g r­eo I N 0 ....

·;.
8 -204 CHASSIS ELECTRICAL
STARTER SWITCH
Refer to "START AND CHARGING" in this section.
STOPLIGHT
STOPLIGHT SWITCH
BRAKE SWITCH
Refer to "STOPLIGHT AND REAR DEFOGGER" in
,c, this section.
SHIFT LOCK CONTROLLER
Refer to the shift lock controller in Section 7 A
"AUTOMATIC TRANSMISSION."
SHIFT LOCK SOLENOID
~ INSPECTION
Fig. 8-247
Joint connector
(solenoid side)
Connect the
joint connector terminal 1 ~to the
battery
(+) terminal and 2 [ill to the (-) terminal
and check to
see if the solenoid works. (Fig. 8-247)
Replace the solenoid when the result
of inspection is
found abnormal.
PARKING POSITION DETECTING
SWITCH
~
(1!]1NSPECTION
l2Ti1
Lill1
Other than P
Fig. 8-248
Check the continuity between the
joint connector
terminals. (Fig. 8-248)
Repair
or replace the switch when the result of
inspection is found abnormal.
I
I I
.............. ~ ................................ -----------------1 .

8-288 CHASSIS ELECTRICAL
METER AND WARNING/INDICATOR LIGHT
GENERAL DESCRIPTION
The circuit consists of the starter switch, meter assembly, vehicle speed sensor, clutch switch, transmission
switch, lighting switch,
turn signal switch, thermo unit, oil pressure unit, Engine Control Module, fuel tank unit,
4WD
SW, oil pressure switch, parking brake switch, brake fluid switch, seat belt switch and illumination
controller.
The meter ASM contains the speedometer, tachometer, voltmeter, engine coolant temperature gauge, oil
pressure gauge, fuel gauge and warning/indicator lights.
The meter warning/indicator lights and
their bulb sockets are a unit, they are installed from the back of the
speedometer assembly.