1986 TOYOTA SUPRA traction control

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Page 653 of 878

TOYOTA SUPRA 1986 Service Repair Manual 51
R9 111
Rear Turn Signal Light LH
[Rear Comb. Light LH]
R10 R11 R12 R15 R16 R17 R18 S3 S6 S7 S8 S9 S11 S12 S13 S14 S15 S16 T1 T3 T4 T5 114 102 116 111 114 102 102 102 203188
208188
20820860
64122
19

Page 654 of 878

TOYOTA SUPRA 1986 Service Repair Manual 52
POWER SOURCE (Current Flow Chart)*1: (FOR CANADA)
*2: (FOR USA)
*Page Nos. of
Related Systems
Parts
Code or
Location
CB or FuseT5 70
82
Location
Malfunction Indicator Lamp
(Check Engine Warning L

Page 674 of 878

TOYOTA SUPRA 1986 Service Repair Manual 75
*
1 : ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU
2 1
2 1
2 1
E14E16 E16 E16 E16
E16E16
B 46 B 24 B 44 B 63 B 42 B 41 B43 B64
B 27 B 7 B 5 B 25 B 6 B 26 1234 4321
12 13 A A A
A
A
13 8 4
1

Page 762 of 878

TOYOTA SUPRA 1986 Service Repair Manual 164
ABS AND TRACTION CONTROL
22
55 55 5 55 5 55 55 55555 555
E5 E5 E2
E5 24 13
23 14
43 61
2
43 61
2
MIB5 16
EBEAG±B
W±G
R±W
L
L±W
V±Y
B±R V±YRLG±R
V
L±B
B±R
V±Y
Y L±Y
G±B
V±Y
L
V±Y V±

Page 764 of 878

TOYOTA SUPRA 1986 Service Repair Manual 166
ABS AND TRACTION CONTROL
A 26 A27 A13 A14 B64 B63 B41
B 16A 17 A10 B8B3B9B2B1B7
A 17 A4A5A18 B2B10 B9B1
IB5 3IB51IB52IB26IB24IB25IC29IC23IC28 IJ2 2
1 2
1 2
2 1
2 1
I9 I9 I9 I9
(
SHIELDED)
R
L
(
SH

Page 766 of 878

TOYOTA SUPRA 1986 Service Repair Manual 168
ABS AND TRACTION CONTROL
I4
I4
I2 I22
IJ1 16 II121IF111
2 1 A 14 A5A13 A24
IJ1 15
I18 I11
IG
W±BW±L
R±L
B±O
W±B
Y
B±R
W±B
W±B
V±GL
P±B
LG
P±B
WL B±R
P± B
WW±B
LG
L±Y
W
L±Y
W±R
B±

Page 768 of 878

TOYOTA SUPRA 1986 Service Repair Manual 170
ABS AND TRACTION CONTROL
(FOR ABS)
THIS SYSTEM CONTROLS THE RESPECTIVE BRAKE FLUID PRESSURES ACTING ON THE DISC BRAKE CYLINDERS OF THE RIGHT
FRONT WHEEL, LEFT FRONT WHEEL, RIGHT REAR WHEEL AND LEF

170
ABS AND TRACTION CONTROL
(FOR ABS)
THIS SYSTEM CONTROLS THE RESPECTIVE BRAKE FLUID PRESSURES ACTING ON THE DISC BRAKE CYLINDERS OF THE RIGHT
FRONT WHEEL, LEFT FRONT WHEEL, RIGHT REAR WHEEL AND LEFT REAR WHEEL WHEN THE BRAKES ARE APPLIED IN A PANIC
STOP SO THAT THE WHEELS DO NOT LOCK.
THIS RESULTS IN IMPROVED DIRECTIONALLY STABILITY AND STEERABILITY DURING PANIC 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 THE BRAKE PEDAL IS DEPRESSED.
(3) PARKING BRAKE SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL PKB OF THE ABS AND TRACTION ECU WHEN THE PARKING BRAKE LEVER IS PULLED UP.
(4) DECELERATION SENSOR SIGNAL
LATERAL ACCELERATION IS DETECTED AND INPUT TO THE ABS AND TRACTION ECU.
2. SYSTEM OPERATION
DURING SUDDEN BRAKING, THE ABS AND TRACTION ECU WHICH HAS SIGNALS INPUT FROM EACH SENSOR CONTROLS THE
CURRENT FLOWING TO THE SOLENOID INSIDE THE ACTUATOR AND LETS THE HYDRAULIC PRESSURE ACTING ON EACH WHEEL
CYLINDER ESCAPE TO THE RESERVOIR. THE PUMP INSIDE THE ACTUATOR IS ALSO OPERATING AT THIS TIME AND IT RETURNS
THE BRAKE FLUID FROM THE RESERVOIR TO THE MASTER CYLINDER, THUS PREVENTING LOCKING OF THE VEHICLE WHEELS.
IF THE ECU JUDGES THAT THE HYDRAULIC PRESSURE ACTING ON THE WHEEL CYLINDER IS INSUFFICIENT, THE CURRENT
ACTING ON SOLENOID IS CONTROLLED AND THE HYDRAULIC PRESSURE IS INCREASED, HOLDING OF THE HYDRAULIC
PRESSURE IS ALSO CONTROLLED BY THE ECU, BY THE SAME METHOD AS ABOVE. BY REPEATED PRESSURE REDUCTION,
HOLDING AND INCREASE ARE REPEATED TO MAINTAIN VEHICLE STABILITY AND TO IMPROVE STEERABILITY DURING SUDDEN
BRAKING.
(FOR TRACTION CONTROL)
THE TRACTION CONTROL SYSTEM IS A SYSTEM WHEREBY THE ªABS AND TRACTION ECUº AND ªTRACTION ECUº CONTROLS THE
ENGINE TORQUE AND THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER OF THE DRIVING WHEELS IN ORDER TO CONTROL
SPINNING OF THE DRIVING WHEELS WHEN STARTING OFF AND ACCELERATING, AND PROVIDE THE MOST APPROPRIATE DRIVING
FORCE IN RESPONSE TO THE ROAD CONDITIONS FOR VEHICLE STABILITY.
TRACTION CONTROL OPERATION
VEHICLE SPEED SIGNALS FROM THE SPEED SENSOR INSTALLED ON EACH WHEEL ARE INPUT TO THE ABS AND TRACTION ECU.
WHEN THE ACCELERATOR PEDAL IS DEPRESSED WHILE DRIVING ON A SLIPPERY ROAD AND THE DRIVING WHEEL (REAR WHEEL)
SLIPS, IF THE ROTATION OF THE REAR WHEEL EXCEEDS THE ROTATION OF THE FRONT WHEELS FOR A SPECIFIED PERIOD, THE
ECU JUDGES THAT THE REAR WHEEL IS SLIPPING.
WHEN THIS OCCURS, CURRENT FLOWS FROM TRACTION ECU TO SUB THROTTLE ACTUATOR TO CLOSE THE SUB THROTTLE
VALVE. AT THE SAME TIME, OPERATION OF THE ABS AND TRACTION ECU CAUSE THE TRACTION BRAKE ACTUATORS (MASTER
CYLINDER CUT, RESERVOIR CUT SOLENOID) TO TURN ON TO SWITCH THE HYDRAULIC CIRCUIT TO ªTRACTIONº MODE.
IN THIS CASE, SIGNALS ARE INPUT FROM TERMINAL SRR OF ABS AND TRACTION ECU TO TERMINAL (B)3 OF ABS ACTUATOR, AND
FROM TERMINAL SRL OF ABS AND TRACTION ECU TO TERMINAL (B)6 OF ABS ACTUATOR, CONTROLLING THE REAR WHEEL
SOLENOID IN THE ABS ACTUATOR AND INCREASING THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER IN ORDER TO
PREVENT SLIP.
TO MAINTAIN THE HYDRAULIC PRESSURE OF THE REAR WHEELS, THE REAR WHEEL SOLENOID INSIDE THE ABS ACTUATOR IS
PUT IN ªHOLDº MODE AND KEEPS THE HYDRAULIC PRESSURE TO THE WHEEL CYLINDER CONSTANT.
WHEN THE AMOUNT OF SLIP HAS DECREASED, THE HYDRAULIC PRESSURE IN THE WHEEL CYLINDER DECREASES.
SYSTEM OUTLINE

Page 770 of 878

TOYOTA SUPRA 1986 Service Repair Manual 172
ABS AND TRACTION CONTROL
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
423R/B NO. 4 (LEFT KICK PANEL)
523R/B NO. 5 (ENGINE COMPARTMENT RIGHT

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