System Operation - Toyota Supra 2015 Wiring Diagram Manual

ABS (W/O TRACTION CONTROL)
SYSTEM OUTLINE
THIS SYSTEM CONTROLS THE RESPECTIVE BRAKE FLUID PRESSURES ACTING ON THE DISC BRAKE CYLINDERS
OF THE RIGHT FRONT WHEEL, LEFT FRONT WHEEL AND REAR WHEELS WHEN THE BRAKES ARE APPLIED IN A
PANIC STOP SO THAT THE WHEELS DO NOT LOCK. THIS RESULTS IN IMPROVED DIRECTIONAL 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
ECU.
(2) STOP LIGHT SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL STP OF THE ABS ECU WHEN THE BRAKE PEDAL IS DEPRESSED.

2. SYSTEM OPERATION

DURING SUDDEN BRAKING, THE ABS 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.
SERVICE HINTS
A 6 (A), A 7 (B) ABS ACTUATOR
(A) 1-GROUND : ALWAYS CONTINUITY
(B) 5-(A) 4:33
(B) 1,(B) 2,(B) 4,(A) 4:APPROX. 8.8
(B) 5,(B) 6,(B) 8,(A) 4:APPROX. 4.3
A10, A11 ABS SPEED SENSOR FRONT LH, RH
1-2:1.4-1.8 K (20 C, 68 F)
A31, A32 ABS SPEED SENSOR REAR LH, RH
1-2:0.9-1.3 K (20 C, 68 F)
A18, (B), A19(A) ABS ECU
(B) 2-GROUND :10-14 VOLTS WITH THE IGNITION SW ON
(B)12-GROUND :10-14 VOLTS WITH THE STOP LIGHT SW ON (BRAKE PEDAL DEPRESSED)
(A) 2, (A) 13-GROUND :ALWAYS CONTINUITY
(A) 1, (A) 4, (A) 10, (A) 11, (A) 21, (A) 22-GROUND:10-14 VOLTS WITH THE IGNITION SW ON
S11 STOP LIGHT SW
1-2:CLOSED WITH THE BRAKE PEDAL DEPRESSED
: PARTS LOCATION
CODE SEE PAGE
A 6 A 26(2JZ-GE)
A 7 B 26(2JZ-GE)
A 8 A 26
A 9 B 26
A10 26(2JZ-GE)
: RELAY BLOCKS
CODE SEE PAGE
2 22
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE SEE PAGE
1E
20
1I
20 20
1K
162
CODE
A11
A18 B
A19 A
A31
A32
RELAY BLOCKS (RELAY BLOCK LOCATION)
R/B NO. 2 (ENGINE COMPARTMENT LEFT)
JUNCTION BLOCK AND HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL) COWL WIRE AND J/B NO 1 (LEFT KICK PANEL)
SEE PAGE
26(2JZ-GE)
28
28
30
30
CODE SEE PAGE
D 1 26(2JZ-GE)
D 5 28
S11 29
T 5 29