TOYOTA CAMRY 1999 Service Repair Manual

ABS AND TRACTION CONTROL
60A
FL ABS
2 1 FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
36 2143
3
33 3 33 3
A 1A24
A 11
A 3 A 9A 13 A26
B4
EA E 1E 1 E 1C 9C10 SR GND3 GND2 SFRH SFRRR+ MR
SFRR SFRH
BS 23
14
W±RR±B W±B W±B W±RGR ±R
W±R GR W± L W± B W±B W±B
R±L
W± R
W±B W±B GR
GR±R
GR±L
GR± L
GR± R
R±L
ABS AND TRACTION ECU
ABS AND TRACTION
ACTUATOR W± L ABS
MOTOR
RELAY
ABS
SOL
RELAY
W±B 5
B A 7 A , A 8 B A15 A , A16 C, A17

C 2C1C8C7A25 A12 C5C4C12 C6A10 A14
A 12 A6A11 A5A10 A4A7A2A8A1B5B3
M
B 2B1
E 1 SFLH SFLR SRRH SRRR SRLH SRLR SRC1 SRC2 SMC1 SMC2 AST MT
AST MT SMC2 SMC1 SRC2 SR C1 SRLR SRLH SRRR SRRH SFLR SFLH
GN D BM
L±B
W±L
W±R
R±G
G± Y
LG±B
B±R
B±Y
Y±R
Y±B
R
R±W
W± RW± RW±B
15A
E CU±IG FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1J 9
B 815A
STOP
1C 7
1 2
1R 41R 5A A
B C
B 16 JUNCTION
CONNECTOR J12
STOP
LIGHT SW S 6
JUNCTION
CONNECTOR
ABS AND TRACTION ECU C C
B±R
W
G± WB±R
G± WG±W
R±L R±L
W± BW±B IG1STP
ABS AND TRACTION ACTUATORA 15GND1
W± B
A15 BA, A16 C, A17
B A 7 A , A 8B J27 A , J28

ABS AND TRACTION CONTROL
II3 4II38II35II311
IK2 8IK25
A 23 B4A9IK2 12 IK12
A 22 B12 CB CB
B
C 23 16 22 11 4 14 17
TS WA TC D/G WT TS TC TC ABS TRC
L G±BR±YR±L R±L
R±Y
G±B
LG±R LG±R LG±RR±Y
G±B
R±L
LR±L LG±R
L
R±L DATA LINK CONNECTOR 1 D 1
DATA LINK CONNECTOR 2 D 4
JUNCTION
CONNECTOR J 3 JUNCTION
CONNECTOR J29
ABS AND TRACTION ECU R±L(
SHORT PIN)
WB WA
G±B LG±R
R±L
A 5A4A17 A18 B2B1
1 21221 ID1 3ID19ID14
ABS SPEED SENSOR
FRONT L H A 9
ABS SPEED SENSOR
FRONT RH A10
ABS SPEED SENSOR
REAR LH A25B 9B10
2 1 IL1 2IL11IL13
ABS SPEED SENSOR
REAR RH A2 6 FL+ FL± FR+ FR± RL+ RL± RR+ RR±
B W W±BR
G
W
B
R
G R
G
Y
BR(
*2)
P
L(
*2) (
SHIELDED) (
SHIELDED)
W± B
IG312
R±LE1
BR 3
C C
C
JUNCTION
CONNECTOR J32
A A15 BA16 , C, A17
BRY± B
(
*2)
P± B
(
*2) (
*1)
LG±R
(
*1)
IK2 1IK26
R
(
*1)
G
(
*1) (
*2)
(
*2)
(
*2) W
(
*1)
(
*1) B
(
*2)
W±B
(
*2)
(
*2) (
*2)

IG 1J 71J 8B 5 B 13 B 14 B 6 B 15
B 16 A14 A21 A13 A20
D 18 D23 D2 B 11
1 4
AA AB A B A B ATRC± TRC+ EFI± EFI+ NE O CSW
BR±W
W
B
LG
L YL BRLG W±B W±B W±BW±B
W±BW± BW± B(
*2)
JUNCTION
CONNECTOR J11
THROTTLE POSITION SENSOR T 2 TRACTI ON
OFF SW T 5 ABS AND TRACTION ECU
JUNCTION
CONNECTOR
E2 VTA1 VC NEO EFI+ EFI± TRC+ TRC±
23110A
GAU GE FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1D 2
B 3IG3 18A 5 C 4 C 3
IG319C 7
L
R±LLR±L
R±L
LG R±L
LG
R±L
JUNCTION
CONNECTOR J 4 COMBINATION METER
INDD D
TRA C OFF
ABS SLIP
ECII3 6A C
B B
A A BR
BR BR BR
B A15 A , A16 CA17 , C C 8 A , C10
B J 7 A , J 8J 7
JUNCTION
CONNECTORB A, J 8
JUNCTION
CONNECTOR J22 ENGINE CONTROL
MODULEA E 7 BE 8 , D, E10 (
*2)
(
*2)
(
*2)
* 1 : TMC MADE
* 2 : TMMK MADE

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 always outputs 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 sucked 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.
ABS MOTOR RELAY [R/B NO.3]
3±4 : Approx. 62 W
ABS SOL RELAY [R/B NO.3]
4±6 : Approx. 80 W
A9, A10 ABS SPEED SENSOR FRONT LH, RH
1±2 :0.6 kW±2.5 kW
A15 (A), A16 (B), A17 (C) ABS AND TRACTION ECU
(B) 8±GROUND : Approx. 12 volts with the ignition SW at ON position
(B)11±GROUND : Continuity with the ignition SW on and the traction off SW on (Traction control off)
(B)16±GROUND : Approx. 12 volts with the brake pedal depressed
(A)15, (C) 9, (C) 10±GROUND : Always continuity
A25, A26
ABS SPEED SENSOR REAR LH, RH
1±2 :1.2 kW±2.3 kW
T2 THROTTLE POSITION SENSOR
1±2 :3.5 kW±5.0 kW
SYSTEM OUTLINE
SERVICE HINTS

: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A7A26 (1MZ±FE)C10C30J1131
A8B26 (1MZ±FE)D126 (1MZ±FE)J1231
A926 (1MZ±FE)D430J2231
A1026 (1MZ±FE)E7A30J27A31
A15A30E8B30J28B31
A16B30E10D30J2931
A17C30J331J3231
A2532J431S631
A2632J7A31T227 (1MZ±FE)
C8A30J8B31T531
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
325Engine Room R/B No.3 (Radiator Upper Support RH)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1C20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1D20Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1R20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
ID140Floor Wire and Cowl Wire (Left Kick Panel)
IG340Instrument Panel Wire and Cowl Wire (Under the Blower Motor)
II342Engine Wire and Cowl Wire (Under the Blower Motor)
IK142Engine Room Main Wire and Cowl Wire (Right Kick Panel)IK242Engine Room Main Wire and Cowl Wire (Right Kick Panel)
IL142Floor No.2 Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
EA36 (1MZ±FE)Right Radiator Side Support
EC36 (1MZ±FE)Surge Tank RH
IG40Instrument Panel Brace LH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E136 (1MZ±FE)Engine Room Main Wire

ABS AND TRACTION CONTROL
12 34 56
78 910 1112
12
3451212
1X
X4 5 XXX91011 12 13
14 15
X 17 18 X X X 22 2324 25 26123456X8
9 1011121314151612X456
78910X121 2
1 2
XX

X
X
X
XX11

XXX
16 X XX X
23 22X












5
X X 3 4 X XX X X
X X X14 X X 17



7
4 3









XX



X
X




X

13 14
20 21




7

4 3










5






BLACK GRAY GRAY GRAY
A15 (A)A16 (B) A17 (C)
(TMMK Made) BLUE
(TMMK Made) BROWN
BLACK DARK GRAY
E7 (A) A7 (A) A8 (B) A9 A10
A25
A26C8 (A)
C10 (C)
D1 D4
(TMC Made) BLUEC8 (A)
(TMC Made) BROWNC10 (C)

1

2


1XX4


B




BBBB


X X






DDDX
AAAAAA



CCC
AA AA
AA AAAA A










CCC










AA











AAAAAA
BBB



AA
AAAA






CCC








CC







C C








CC123
X

XX





XX



X X
16 X

X X

X
X

X














2




18
X
23





J3
BLACK GRAY(Hint : See Page 7)
(Hint : See Page 7)
(Hint : See Page 7)GRAYJ11
BLACKJ22 J27 (A)J28 (B)
(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)
J29GRAY BLUE
BLACK
BLACK(Hint : See Page 7)
J4 J7 (A) J8 (B)
J12
J32 S6
T2
T5E8 (B)
(California)E10 (D)
X





X


X
2




18 XX
23




(Except California) BLACK
E10 (D)

ABS (TMC MADE)
ABS ECU
A 3A 10 B 2
B 1
SFRH B 1
B 5
SFRR A 5
B 3
SFLH A 6
B 7
SFLR A 11
B 4
SRRH A 12
B 8
SRRR B 15
B 2
SRLH B 14
B 6
SRLR
MA 4 A 1II3 5 II3 8 II3 11II3 4 60A
FL ABS
2 1 FROM POWER SOURCE SYSTEM
(
SEE PAGE 50)
24 13
36 214
3 3 3 3 3333
B 21 B 8 B 24 B 26IK 28
A 7 A 1
A 2 E 1B23DATA LINK
CONNECTOR 1 D 1
DATA LINK
CONNECTOR 2 D 4
144111622
B
JUNCTION CONNE CTOR J 3ABS MOTOR RELAY
ABS SOL RELAY ABS ACTUATOR
MT BS E BM
R±WW± LW± RW±B
W±B W±B
R+ SR MR5
B GR±RR±L R±L
R±L
G± B R±Y LG±R
LG±RR±L GR ±R W±B
W±L
GR GR±LW±R
R±Y LG±R
LG±R(
SHORT PIN)
ABS TC TS WATCWB
G±B
ECII3 6A C
B B
E1 BR
BR BR BR
JUNCTION
CONNECTOR JUNCTION
CONNECTOR J23(
5S±FE) J22(
1 MZ± FE)
A A3
MT TS TC D/G
SRLR SRLH SRRR SRRH SFLR SFLH SFRR SFRH
R±B W±RL±B W± L W± RR±G G± Y LG±BB J 7 A , J 8
B A18
A, A19
B A 4 A , A 5
IK1 1
IK2 5IK213
LG±B
G±Y
GR±R
IK2 12 IK211
W±R
R±B
EA

1 2 1 2 1D 21C7 1J 9
IL1 1 IL1 2 ID1 9 ID1 3
2 1 2 1 B 22 B910B23 B 13 B5 B 11FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
R±L
B±R B±R
G±W G±WR±L
R
G G R
W
BW
B
ABS SPEED SENSOR
FRONT LHABS SPEED SENSOR
FRONT RH D D10A
GAUGE
ABS WARNING
LIGHT
[COMB. METER]
ABS SPEED SENSOR
REAR LHABS SPEED SENSOR
REAR RH 15A
ECU±IG15A
STOP
ABS ECUA 9 A10R±L
J 4
JUNCTION
CONNECTOR
C10
B
A25 A261R 51R 4
STOP LIGHT SW
W G± W1 2S 6
IGB 12 B 25
A
JUNCTION
CONNECTOR J11
W±B W±B
IG3 12
C7
C4
G±B G± B
B CA A
C CCIK2 1IK26
A 9 A 3 A 2 A 8
R
G
W
BGRJUNCTION
CONNECTOR JUNCTION
CONNECTOR J29
JUNCTION
CONNECTOR J12
G± B
GND2 GNDSTP
RL± RR±FL ± FR± FL + FR+
RR+ RL+ IG1 WAB J27 A , A28
B A18 A , A19