brake fluid ISUZU TROOPER 1995 Service Manual

7 A-98 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 33
TCC HIGH SHORT TO PLUS OR OPEN
This DTC flashes the CHECK TRANS indicator and
does NOT set the BACKUP MODE.
Circuit Description:
• The Torque Converter Clutch (TCC) solenoid is a
simple ON/OFF solenoid connected to the
adapter case valve body. When the solenoid is
energized
by the Transmission Control Module
(TCM), it opens a fluid port. When the port is
open,
line pressure actuates the converter clutch
control valve which engages the torque converter
clutch by exhausting the fluid. The TCM engages
the torque converter clutch only when all of the
following conditions exist:
G) The transmission is at operating temperature.
® The brake pedal is released.
® The transmission is operating in second, third
or fourth gear.
@ The engine is warm (more than 70°C).
® The shift pattern requests TCC apply.
® Shift finished.
(]) No malfunction which will disable the TCC:
DTC43, DTC55
(only short to ground).
• The solenoid is activated by a current. This
current is produced by applying a voltage to one
side (the High side) and a ground to the other
side (low side).
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoid and
the supply voltage. The High side of the TCC
solenoid is used to turn the TCC ON or OFF
because the Low side is permanently connected
to the ground of the transmission. In BACKUP
MODE
or when ignition is turned OFF the TCC
High Side is
turned OFF.
• The TCM continually monitors the solenoid
connection to its High Side Driver for either low
or high voltage.
• There is only one test of the HSD for TCC: when
the engine is cranked and the TCC is turned OFF.
•
If this circuit is shorted to plus, the TCC solenoid
is constantly commanded ON (shifts can be firm).
In 1st gear the TCC is hydraulically OFF, whatever
the TCC solenoid position. This means that the
car can be driven even with the TCC shorted to
voltage. The engine could stall when the driver is
braking strongly, if the car is stopped when the
transmission is still in second gear with TCC
applied. Note: The 3-2
shifts are very firm.
Diagnostic Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
G) The solenoid high side connected to TCM
terminal C7 is shorted to voltage or open.
® The condition needs to be present for 0.13
second.
• Action after the detection time:
G) TCC is turned OFF.
® CHECK TRANS indicator turned ON.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
I - - - -C-91 BRN/BLU H-10
TOFlQU!;
I ? (( 4(A) J., M-6
I Cot!M:R'teR I I c7 15 I --1· -.-- - - ---. AUTOMATIC .. CLU'IrlilH I I S~NOib I I I TRANSMISSION
leoti~~~~ I . I I T()ftotJE
I I I I II CoHVEMER I I ' CLUTCH I I I I SQLENOID I
I 1: I I
I II I I I
I I H-11 - --!._-- - - - - -
{ I
{
BLK/ORN ~
9
-=-
1 GROUND I I C1 BLK/BLU : 5
1_--_,) 01 ( 1
TRANSMISSION
CONTROL MODULE (TCM)
•

7A-102 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE
(DTC) 34
BAND APPLY SOLENOID SHORT TO GROUND OR OPEN
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Circuit Description:
• The band apply solenoid is a normally open
solenoid
which controls the flow of fluid for brake
band
application. The Transmission Control
Module (TCM) uses Pulse Width Modulation
(PWM) and changes the duty cycle to control the
solenoid. The
TCM turns the solenoid ON
(energized) and OFF (de-energized) at a constant
frequency. The length
of time the solenoid is
energized
during each ON/OFF cycle is called the
pulse
width. By varying or "modulating" the
pulse
width, the solenoid output pressure is
changed.
Since the solenoid is normally closed,
increasing the pulse width increases the duty
cycle and decreases the output pressure. PWM
control provides smooth band application
without an accumulator. The band is only
applied in first and second gears.
• In the event of an electrical failure (open), the
solenoid regulates at the
maximum oil flow (0%
duty cycle).
• The solenoid is activated by a current. This
current is produced
by applying a voltage to one
side (the High side) and a
ground to the other
side (low side).
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoids and
the
supply voltage. The High side of the solenoid
is
permanently supplied with voltage, except in
BACKUP
MODE or when Ignition is OFF the HSD
2{8)\l, M-7
r----C-90 BRN/YEL H-10 ( 12
is turned OFF.
• The TCM continually monitors the splenoid
connection
to its low Side Driver (LSD) for either
low or high voltage. The LSD is a circuit of the
TCM that acts as a switch between the solenoid
and
ground. When the solenoid is commanded
ON the TCM is switching the solenoid to ground.
• There are two tests of the LSD: when the engine
is cranked (DTC82) and
when the ignition is
turned ON (DTC34).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the shift
solenoids (1-2/3-4, 2-3 and Band) to check for
short circuits or open circuits. To do so the gear
is set
to 4th, 3rd, 1st, 1st with band apply, 4th
with no HSD. Each one of the 5 tests requires
0.15 second. If the engine is cranked before the
end
of all tests, the remaining tests are not done.
Diagnostic Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD The solenoid low side connected to TCM
terminal A9 is shorted to ground or open.
@ The test is only done when ignition is ON.
@ Engine Speed <480 RPM (not cranked) and
Output Speed= 0 RPM.
® The condition needs to be present for 0.15 to
0.75 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
: --r ----r ----
1-
- -: ~Z[;'~,~~ION
I 1'•1 ~~ If ~!FT . i '· !: J GROUND A9
I
I
I
1 ·. SOI:!Noto· R sOLI!lQI,~, . ~ , ~. sOt.ENOiti•J
I ,Ji'Ji ·
· I
I •• ) . I
--~~---------~---~ >--------< I
I
I I
BAND APPLY C-91 BRNtWHT H-10
I SOLENOID ( CONTROL : C12 10
I .
: GROUND {
. BLK/ORN . ; C1 BLK/BLU :> 01 ..... ---J
H-11
TRANSMISSION
CONTROL
MODULE (TCM)
•

7A-114 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 43
TCC HIGH SHORT TO GROUND
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The Torque Converter Clutch (TCC) solenoid is a
simple ON/OFF solenoid connected to the
adapter case
valve body. When the solenoid is
energized
by the Transmission Control Module
(TCM), it opens a fluid port. When the port is
open,
line pressure actuates the converter clutch
control valve
which engages the torque converter
clutch by exhausting the fluid. The TCM engages
the
torque converter clutch only when all of the
following conditions exist:
G) The transmission is at operating temperature.
@ The brake pedal is released.
® The transmission is operating in second, third
or fourth gear.
® The engine is warm (more than 70°C).
@ The shift pattern requests TCC apply.
® Shift finished.
(f) No malfunction which will disable the TCC:
DTC33, DTC55 (only short to ground).
• The solenoid is activated by a current. This
current is produced
by applying a voltage to one
side (the High side) and a
ground to the other
side (low side).
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoid and
the supply voltage. The High side of the TCC
solenoid is used to turn the TCC ON or OFF
because the Low side is permanently connected
to the ground of the transmission. In BACKUP
MODE or when ignition OFF the TCC High Side is
turned OFIF.
• The TCM continually monitors the solenoid
connection of to its High Side Driver for either
low or high voltage.
• There is only one test of the HSD for TCC: when
the engine is cranked and the TCC is turned ON.
Diagnostic .Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
G) The solenoid High side connected to TCM
terminal C7 is shorted to ground.
@ The condition needs to be present for 0.07
seconds after ignition switch ON.
•
Action after the detection time: TCC is turned
OFF.
• Recovery eonditions: To recover, do an IGNITION
CYCLE.
r - - --, C-S1 BRN/BLU H-10 TORQUE I >-----__:_---<1 ~ ~'---------4-(A~) \1, M-6
g~~i~~TER I C7 II --1-- -- ---, AUTOMATIC
SOLENOID 1 TRANSMISSION
I
I
CONTROL
I I
I {I? GROUND I I C1 )
l---~ 01
TRANSMISSION CONTROL
MODULE (TCM)
I
: II
I
TORQUE CONVE:RTER CLUTCH
SOLEt\A0
I I H-11 - -~· - - - - - - -BLKJORN ~
9
-=-,5 BLK/BLU (
1
•

7A-116 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 44
BAND APPLY SOLENOID SHORT TO PLUS
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Circuit Description:
• The band apply solenoid is a normally open
solenoid which controls the flow of fluid for brake
band
application. The Transmission Control
Module (TCM) uses Pulse Width Modulation
(PWM) and changes the duty cycle to control the
solenoid. The TCM turns the solenoid ON
(energized) and OFF (de-energized) at a constant
frequency. The
length of time the solenoid is
energized
during each ON/OFF cycle is called the
pulse width. By varying or "modulating" the
pulse width, the solenoid output pressure is
changed.
Since the solenoid is normally closed,
increasing the pulse width increases the duty
cycle and decreases the output pressure. PWM
control provides smooth band application
without an accumulator. The band is only applied
in first and second gears.
• In the event of an electrical failure (open), the
solenoid regulates at the maximum oil flow (0%
duty cycle).
•
The solenoid is activated by a current. This
current is produced by
applying a voltage to one
side (the High side) and a
ground to the other
side (low side).
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoids and
the
supply voltage. The High side of the solenoid
is permanently supplied with voltage, except in
BACKUP
MODE or when ignition is OFF the HSD
H-7
is turned OFF.
• The TCM continually monitors the solenoid
connection to its Low Side Driver (LSD) for either
low or high voltage. The LSD is a circuit of the
TCM
that acts as a switch between the solenoid
and ground. When the solenoid is commanded
ON the TCM is switching the solenoid to ground.
• There are two tests of the LSD: when the engine
is cranked (DTC82) and
when the ignition is
turned
ON (DTC44).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the
shift
solenoids (1-2/3-4, 2-3 and Band) to check for
short circuits or open circuits. To do so the gear
is set
to 4th, 3rd, 1st, 1st with band apply, 4th
with no HSD. Each one of the 5 tests requires
0.15 second. If the engine is cranked before the
end
of all tests, the remaining tests are not done.
Diagnostic Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD The solenoid Low side connected to TCM
termin.al A9 is shorted to voltage.
@ The test is only done when ignition is ON.
@ Engine Speed < 480 RPM (not cranked) and
Output
Speed = 0 RPM.
@ The condition needs to be present for 0.15 to
1.18 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
,... BATTERY-, C-90
I INPUT I? A4 GRN/WHT ·~-----BATTERY
( 4
I IGNITION I ? I INPUT A7 II
I { I? AS I GROUND I ? A3
I
)
I A2
I I
I
I
I I
I I
I
I
I I
I SHIFT& I
I BANDAPPLY C-91 SOLENOID I 1 _:oNTROL _ 1
TRANSMISSION
CONTROL MODULE (TCMI
C12
RED/GRN
BRN/YEL
BRN/BLK
BRN/RED
BRN/WHT
H-42 •--::------ECM MAIN RELAY )) 8 H-10
«--------3-(D--,I'l----- --'~L -,,,l M-7
( 12
2:j
16 r-- -r ----r ----
1-- --
AUTOMATIC I
I TRANSMISSION
: H::Q]:;& : I OLE SOlENOID I
I I
I I
1-213-4 2-:
-II
SHIFT
II
s SOLE NOlO s
-"--------_______ .J
H-10 ( 10
•

... ......,.
AUTOMATIC TRANSMISSION (4L30-E) 7A-155
ON-VEHICLE SERVICE
CHECKING TRANSMISSION FLUID
LEVEL
1. Park the vehicle on level ground.
2. Apply the parking brake.
3. Place the automatic transmission in "Park" and
start the engine.
Allow the engine to idle for
two minutes.
4. With the brakes applied, move the shifter lever
through all the gear ranges, ending in "Park".
5. Remove the dipstick, Carefully touch the
dipstick with your finger to determine the
temperature of the fluid. (Fig. 7A-14)
• If the fluid is cool or warm (approximately
room temperature) or slightly higher (but
not too hot to touch), the fluid level should
be within the "Cold" range.
• If the fluid is hot, the fluid level should be
(A; within the "Hot" range.
6.
Cold Hot
Fig. 7A-14
• If the vehicle has just been driven for a long
period of time at highway speeds or in city
traffic in hot weather, wait 30 minutes for
the fluid to cool down before checking fluid
level.
If fluid level is low, add enough DEXRON®-m
Automatic transmission fluid to bring trans­
mission
to its proper fluid level through the
transmission oil filler tube.
NOTE:
The automatic transmission fluid level must be
checked
with the vehicle at normal AfT oil
operating temperature: 75 TO 85°C (167 TO
185°F)
measured with TECH1 scan tool.
Overfilling or underfilling could result in
damage
to the transmission.
• If fluid level is low, inspect the area around
the oil pan for leakage.
•
If the fluid smells burnt or is black, replace
it.
CHANGING TRANSMISSION FLUID
There is no need to change the transmission fluid
unless the transmission is used under one or more
of the following heavy duty conditions.
A: Repeated
short trips
B: Driving on rough roads
C: Driving on dusty roads
D: Towing a trailer
If the vehicle is used under these conditions,
change the fluid every 20,000 miles (32,000 km.)
There is
no drain plug in the oil pan. Oil should be
extracted
with suitable suction device through the
filler tube. Alternately the fluid can be drained by
carefully removing the oil pan. Place a large drain
pan
under the oil pan, remove 13 bolts on the right,
left and front sides of the oil pan and loosen 3 bolts
on the rear side.
Drain
the fluid carefully.
Hold
the pan horizontally, remove the remaining 3
bolts and remove pan and gasket. Clean the oil pan
and
reinstall it . with a new gasket. It is also
recommended to replace the fixing bolts. Tighten
16 fixing bolts to 11 N·m (8 lb·ft.) torque.
MANUAL LINKAGE
~ INSPECTION
1. Make sure that when the shifter control lever is
shifted
from "P" to "L", a "clicking" can be felt
at each shift position. Make sure that the gear
corresponds
to that of the position plate
indicator.
2. Check to see if the shifter lever can be shifted
as
shown in Fig. 7A-15. jQ
~ Button must be pressed.
~ Button need not be pressed.
Fig. 7A-15

7A-174 AUTOMATIC TRANSMISSION (4L30·E)
1•!•1 biSASSEMBLV
During the disassembly and reassembly of the
following components, perform the following:
• Wash each part thoroughly and blow air
through each oil passage and groove to
eliminate blockage.
• Seal rings, roll pins and gaskets should be
replaced
with new parts.
• When assembling the components, apply
DEXRON®-m Automatic Transmission Fluid
(ATF)
to each seal, rotating part and sliding
part.
• Do not dip those parts having a facing, such as
drive plate for clutch or brake, in the cleaner
when washing it with solvent.
Also, always wash
it with new ATF two or
three times after cleaning with solvent.
1. Torque converter (Fig. 7A-30)
l"i:\1 • Drain fluid from torque converter.
~ • Attach holding fixture to the transmission
and set it on holding fixture base (Fig. 7A-
31).
Holding fixture: J-8763-02
Fixture base: J-3289-20
w NOTE:
Do
not overtighten the tool, as case damage
may result.
Fig. 7A-31
2. 0-ring (Fig. 7 A-30)
•
Remove 0-ring from turbine shaft.
3. Mode switch and transmission harness (Fig.
7A-30)
•
Remove two 10mm screws, cover and
mode switch.
• Remove transmission harness.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Adapter case oil pan (Fig. 7 A-30)
•
Remove twelve 10mm screws, adapter oil
pan, and gasket.
• Remove oil filler tube.
Wiring harness (Fig. 7 A-30)
•
Disconnect electrical connections from
solenoids. Pull on connectors only, not on
wiring harness.
Adapter case valve body (Fig. 7A-30)
• Seven
13mm screws, adapter case valve
body assembly, transfer plate and two
gaskets.
• Remove wmng harness and 5 pin
connector.
Main case oil pan (Fig. 7 A-30)
•
Remove sixteen 10mm screws, main oil
pan, magnet, and gasket.
Oil filter· (Fig. 7 A-30)
•
Remove three 13mm screws, oil filter.
Manual detent (Fig. 7 A-30)
•
Remove two 13mm screws, roller & spring
and manual detent.
Wiring harness (Fig. 7 A-30)
•
Disconnect harness assembly from band
apply solenoid, shift solenoids and main
case 4 pin connector.
• Remove 4 pin connector.
Servo cover (Fig. 7 A-30)
•
Remove four 13mm screws, servo cover
and
~1asket.
Main case valve body (Fig. 7 A-30)
•
Remove seven 13mm valve body screws.
• Remove main valve body assembly with
manual valve link and transfer plate.
NOTE: Note
thE! position of link, with the long end into
valve, short end into range selector lever.
• Remove gasket transfer plate from main
case.
• Remove two check balls from main case.
13.
Servo Piston (Fig. 7A-32)
• Turn transmission to vertical position to drain
fluid. Return back
to horizontal position when
drained.
• Install servo piston spring compressor with
offset to the rear of case.
• Compress servo piston assembly.
• Remove servo piston retaining ring.
• Slowly release servo piston assembly.
• Remove tool.
1®.1 • Remove servo piston assembly, return spring,
and servo apply rod.
Servo piston spring compressor: J-23075
•

Fig. 7C-36
(6) Clutch pedal engagement height inspection
(Fig.
7C-37)
block the wheels.
® Start the engine, fully step on the clutch
pedal,
and move the shift lever to 1st
position.
@ With the engine idling, release the
clutch pedal slowly and measure its
stroke -just prior
to its clutching
position.
Clutch pedal engagement height (H3) mm (in)
MIN. 30 (1.18)
If the
measured value exceeds the specified
limit, check the following points. Repair if
necessary.
• Hydraulic circuit for fluid leakage or air in
circuit.
• Clutch disc warped.
• Diaphragm spring weakened or tip of
fingers worn.
• Driven plate sticking on sprines.
• Release bearing worn or damaged.
• Master cylinder and slave cylinder worn.
Floor panel
Fig. 7C-37
CLUTCH 7C-15
2. Torque N·m (lb·ft)
Master cylinder to dash panel 16 (12)
Clutch pedal to dash panel 21 (15)
Master cylinder push rod to yoke 17 (12)
Clutch pipe to master cylinder 20 (14)
Clutch pipe
to damper cylinder 12
(104 lb·in)
Clutch
pipe to flex, hose 20 (14)
Slave cylinder to case 43 (32)
Slave
cylinder bleeder screw 8 (691b·in)
Clutch
pipe to slave cylinder 20 (14)
Damper cylinder bleeder union nut 49 (36)
Damper cylinder bleeder pipe 15 (11)
Damper cylinder
bleeder screw 8 (69 lb·in)
3. Bleeding
(1) Check
the level of clutch fluid in the reservoir
and
replenish if necessary (Fig. 7C-38).
Fig. 7C-38
Bleeding the damper cylinder (Fig. 7C-39)
Damper cylinder
Fig. 7C-39

7C-18 CLUTCH
Fig. 7C-43
Fig. 7C-44
SLAVE CYLINDER
~\
4
5
3
l•!•l REASSEMBLY
To reassemble, follow the disassembly steps in the
reverse
order, noting the following points:
1. Cylinder body
D • lmmHrse the cylinder body in clean brake fluid
L:::J (Fig. 7C-45).
2. Piston assembly
D Before installing, apply a thin coat of rubber
L:::J grease to the piston. Install cup in groove in
IE41 piston with the lip turned to front of cylinder.
Use care to prevent damaging the lip of the piston
seat.
Fig.
7C-45
Disassembly steps
1. Boot
2. Push rod
3. Piston and piston
cup 4. Spring
5. Cylinder body
Reassembly steps
To reassemble, follow the disassembly steps in the reverse order.
Fig. 7C-46
•

GROUNDING POINT
REFERENCE TABLE
Connector No.
Cable harness
~
~
I B-1a1
Body harness
I B-191
I B-261
1 lc-16 I
2IC-16 I
3IC-16 I
4IC-16 I
Engine room
5IC-16 I
harness
6IC-16 I
7IC-16 I
aiC-16 1
Location
Body-RH
Body-LH
Body-center
Fender-LH
CHASSIS ElECTRICAL 8-29
Parts (Load)
Remind buzzer, Key remind switch (Starter
switch),
Sun roof control unit, Sun roof motor, Sun roof switch, Safety stop switch, Limit
switch
Door lock key switch (Front-RH), Cruise control
unit, Cigar lighter, Door mirror (RH), Front door
key switch (RH), Front door lock actuator (RH),
Fan switch, Starter relay, Front
door lock & power window switch (LH, RH), Front power window motor
Door lock key switch (Front-LH), Front power window motor (LH), Door mirror (LH), Front
door key switch (LH), Front door lock actuator
(LH), Rear wiper intermittent relay, Front door
lock & power window switch (LH)
Starter relay, Headlight
wiper switch,
Anti-theft controller,
Dimmer·passing switch, Fog light switch, Headlight, Lighting
relay, Fog
light relay, Illumination controller,
Illumination light, Rear defogger switch, Rear
defogger relay, Flasher unit,
Power window relay, Cruise control main relay, Kick-down
switch, Audio, Intermittent relay (front), Mode SW, Tail relay, Lighting SW, Cornering light
relay, Glove box switch, Digital clock,
Transmission control module, Heater & A/C
relay, Front
door key switch, Door mirror
control switch, Door mirror folding switch,
Door mirror defogger switch, Meter assembly
Seat heater, Seat heater switch, Fuel pump, Fuel pump relay, Seat belt switch, Remind
buzzer, Power and winter switch, Shift lock
controller, Rear
door lock actuator, Fuel tank
unit, Power seat SW, Front tilt motor & switch,
Rear tilt motor & switch, Slide motor, Recliner
motor & switch, Rear power window switch
(LH, RH), Rear power window motor (LH, RH),
Seat belt warning light
Headlight
wiper motor
Power steering pressure SW
4WD switch, 4WD indicator (meter), Brake fluid
SW, Oxygen sensor (M/T)
Electronic brake control
module
Front side marker light (LH, RH), Cornering
light, Cornering light switch (Combination
switch), Front turn signal light, Turn signal light switch (Combination switch), Parking light (LH, RH)
Fog light, Fog light relay
Hydraulic
unit
Oxygen sensor (AfT), ABS & Upshift relay,
Transmission SW

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