Lexus ES300 (1997 year). Manual — part 650
194
ABS AND TRACTION CONTROL
(ABS)
ABS IS A BRAKE SYSTEM DESIGNED FOR THE PURPOSE TO IMPROVE THE OPERATING ABILITY SECURING THE STABILITY OF
THE VEHICLE BY PREVENTING THE LOOKING–UP OF THE VEHICLE CONTROLLING THE WHEEL CYLINDER PRESSURE OF ALL
THE FOUR WHEELS AT THE TIME OF SUDDEN BRAKING.
1. INPUT SIGNALS
(1)
SPEED SENSOR SIGNAL
THE SPEED OF THE WHEELS IS DETECTED AND INPUT TO TERMINALS FL+, FR+, RL+, AND RR+ OF THE ABS AND TRACTION
ECU.
(2)
STOP LIGHT SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL STP OF THE ABS AND TRACTION ECU WHEN BRAKE PEDAL IS DEPRESSED.
2. SYSTEM OPERATION
WHEN THE WHEELS ARE TO BE LOCKED–UP, THE SOLENOID INSIDE THE ACTUATOR WILL BE CONTROLLED BY THE SIGNAL
FROM THE ABS AND TRACTION ECU AND THE BRAKE FLUID IN THE WHEEL CYLINDER WILL FLOW THROUGH THE RESERVOIR
AND REDUCE THE HYDRAULIC PRESSURE.
WHILE THE ABS IS IN OPERATION, AS THE ABS AND TRACTION ECU IS ALWAYS OUTPUTTING THE OPERATION SIGNAL TO THE
PUMP INSIDE THE ACTUATOR, BRAKE FLUID STORED INSIDE THE RESERVOIR WILL BE SUCTIONED UP BY THE PUMP INSIDE THE
ACTUATOR AND RETURNED TO THE MASTER CYLINDER.
WHEN THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER IS DECOMPRESSED OR INCREASED UNTIL THE NECESSARY
HYDRAULIC PRESSURE, THE SOLENOID INSIDE THE ACTUATOR IS CONTROLLED BY THE CONTROL SIGNAL FROM THE ABS AND
TRACTION ECU AND AS A RESULT, HYDRAULIC PRESSURE OF THE WHEEL CYLINDER WILL BE CLOSED AT BOTH ROUTES OF
THE MASTER CYLINDER AND RESERVOIR SIDES AND THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER WILL BECOME TO
BE IN THE HOLDING CONDITION.
IF THE INCREASE OF HYDRAULIC PRESSURE VOLUME OF THE WHEEL CYLINDER BECOMES NECESSARY, WITH THE CONTROL
SIGNAL FROM THE ABS AND TRACTION ECU, THE SOLENOID INSIDE THE ACTUATOR WILL BE CONTROLLED AND BECOME THE
SAME CONDITION AS USUAL AND THE BRAKE FLUID OF THE MASTER CYLINDER WILL BE SENT TO THE WHEEL CYLINDER AND
WILL INCREASE THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER. AT THIS TIME, IN THE CASE THAT THE BRAKE FLUID
STAYS LEFT IN THE RESERVOIR, IT WILL BE SUCTIONED UP BY THE PUMP INSIDE THE ACTUATOR AND WILL BE SENT TO THE
WHEEL CYLINDER.
ALSO, INCREASING SPEED OF THE HYDRAULIC PRESSURE IS CONTROLLED BY OUTPUTTING THE INCREASING AND THE SAID
HOLDING ONE AFTER ANOTHER.
(TRACTION CONTROL)
TRACTION CONTROL SYSTEM IS DESIGNED TO PERFORM THE ENGINE OUTPUT CONTROL BY THE FUEL CUT AND HYDRAULIC
PRESSURE CONTROL OF DRIVING WHEEL BRAKE AND CONTROL THE SPINNING OF THE DRIVING WHEELS. BY DOING THIS, IT
IMPROVES STARTING ACCELERATION AND OPERATING ABILITY OF THE VEHICLE SECURING THE DRIVING ABILITY IN
ACCORDANCE WITH THE ROAD SURFACE CONDITION.
3. TRACTION CONTROL OPERATION
ESTIMATING THE VEHICLE SPEED FROM THE REAR WHEEL SPEED, COMPARING IT WITH THE FRONT, DRIVING WHEEL SPEED
AND JUDGING THE GRIP CONDITION OF THE DRIVING WHEELS. FROM THE ESTIMATED VEHICLE SPEED, TARGET SPEED OF THE
DRIVING SPEED WILL BE SET. WHEN THE FRONT, DRIVING WHEEL SPEED EXCEEDS THE CONTROL STARTING SPEED, IT
JUDGES THAT THE TIRE SLIP IS OCCURRED AND PERFORMS THE FUEL CUT CYLINDER NUMBER CONTROL AND BRAKE
CONTROL AND THEN ADJUST TO MAKE THE FRONT WHEEL SPEED BECOME THE TRACTION CONTROL TARGET SPEED.
CONTROLLING OF THE TRACTION CONTROL WILL BE COMPLETED WHEN THE VEHICLE MOVE ONTO THE ROAD WHERE THE
DRIVING WHEELS WILL NOT HAVE A TIRE SLIP OR WHEN THE DRIVER DECELERATE.
SYSTEM OUTLINE
A
B
C
195
A19 , A20 ,A21 ABS AND TRACTION ECU
IG1 – GND : 10–14 VOLTS WITH IGNITION SW AT ON POSITION
R+ – SR : 9–14 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT OFF
R+ – MR : 0–1 VOLTS WITH IGNITION SW AT ON POSITION
WA – GND : 0–2 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT ON
: 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT OFF
STP – GND : 0–1.5 VOLTS WITH STOP LIGHT SW OFF
: 8–14 VOLTS WITH STOP LIGHT SW ON
D/G – GND : 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT ON
MT – GND : 0–1.5 VOLTS WITH IGNITION SW AT ON POSITION
NEO – GND : PULES GENERATION WITH IDLING
IND – GND : 0–2 VOLTS WITH IGNITION SW AT ON POSITION AND SLIP INDICATOR LIGHT ON
: 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND SLIP INDICATOR LIGHT OFF
WT – GND : 0–2 VOLTS WITH IGNITION SW AT ON POSITION AND TRAC OFF INDICATOR LIGHT ON
; 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND TRAC OFF INDICATOR LIGHT OFF
CSW – GND : 0–2 VOLTS WITH IGNITION SW AT ON POSITION AND TRAC OFF SW PUSHED
: 8–14 VOLTS WITH IGNITION SW AT ON POSITION AND TRAC OFF SW RELEASED
TC, TS – GND : 8–14 VOLTS WITH IGNITION SW AT ON POSITION
TRC+, TRC– – GND :
PULES GENERATION WITH TRACTION CONTROL ACTIVE
EFI+, ERI– – GND : PULES GENERATION WITH IGNITION SW AT ON POSITION
SRLH, SRLH, AST – GND : 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND WARNING LIGHT OFF
SFLH, SRRR, SRRH – GND : 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND WARNING LIGHT OFF
SFRR, SFRH, SFLR – GND : 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND WARNING LIGHT OFF
SRC1, SRC2, SMC1, SMC2 – GND : 10–14 VOLTS WITH IGNITION SW AT ON POSITION AND TRAC OFF INDICATOR LIGHT OFF
S10 STOP LIGHT SW
2–1 : CLOSED WITH BRAKE PEDAL DEPRESSED
A 9, A10, A34, A35 ABS SPEED SENSOR FRONT LH, RH, REAR LH, RH
1–2 : 1.5–1.7 K
Ω
(20
°
C 68
°
F)
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
A 7
A
26
C 8
B
28
J 9
B
29
A 8
B
26
C10
D
28
J15
29
A 9
26
D 1
26
J24
29
A10
26
D 3
28
J27
29
A19
A
28
E 7
A
28
J28
A
29
A20
B
28
E 9
C
28
J29
B
29
A21
C
28
J 1
29
J30
29
A24
28
J 3
29
S10
29
A33
30
J 4
29
T 2
27
A34
30
J 8
A
29
T 5
29
: RELAY BLOCKS
CODE
SEE PAGE
RELAY BLOCKS (RELAY BLOCK LOCATION)
3
23
ENGINE ROOM NO.3 R/B (RADIATOR UPPER SUPPORT RH)
,,,
,,,
,,,
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1C
24
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1D
24
INSTRUMENT PANEL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1J
24
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1R
24
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
SERVICE HINTS
196
ABS AND TRACTION CONTROL
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
ID1
36
FLOOR WIRE AND COWL (LEFT KICK PANEL)
IJ1
38
INSTRUMENT PANEL WIRE AND COWL WIRE (UNDER THE GLOVE BOX)
IK3
38
ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)
IH1
IM2
38
ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
IM3
(
)
IN1
38
FLOOR NO. 2 WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODE
SEE PAGE
GROUND POINTS LOCATION
EA
34
RIGHT RADIATOR SIDE SUPPORT
EB
34
RIGHT RADIATOR SIDE SUPPORT
ED
34
SURGE TANK RH
II
36
INSTRUMENT PANEL BRACE LH
: SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
E 1
34
ENGINE ROOM MAIN WIRE
1
2
3
4
5
1
2
1
2
1
X X 4 5 6 X X 9 10 11 12 13
14 15
X 17 18 19 X X 22 23
24 25 26
1 2 3 4 5 6 X 8
9 10 11 12 13 14 15 16
1
2
X
4
5
6
7
8
9 10 X 12
X
X
18
20
X X X
1
2
1
2
4
A
GRAY
A 7
B
BLACK
A 8
A
A19
B
A20
C
A21
B
C 8
A 9
GRAY
A10 GRAY
A33 GRAY
A24 GRAY
A34 GRAY
1
2
3
4
5
6
7
8
9 10
11 12
X
X
197
7
6
3
X X
X
X
X
X
X 11
X X
X
16 X
X
X
X
23
22
X
X
X
4
X
X
X
X
X
X
X
X
14
X
17
X
X
1
X
7
X
22
X
19 X X
X
X
25 26 27 28
B B
B B
A A A A A
D D D
A A A A A A
A A A A A A
A
A
A
A
A
A
A A A A A
A A
X X
C C
X X
C C C
F F
1
2
1 2 3
1 X X
4
D BROWN
C10
C
E 9
A
E 7
A GRAY
J 8
B GRAY
J 9
A
J28
B
J29
J30
S10 BLUE
T 2 BLACK
T 5 BLACK
D 1 BLACK
D 3 DARK GRAY
J 4 BLACK
J 3
J 1 GRAY
J15
J27
A A
A A
A A A A A A A
3
3
B
B
B
C C C
B B B
J24
F F
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
(HINT : SEE PAGE 7)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст