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A.B.S. (ANTI–LOCK BRAKE SYSTEM)
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 A.B.S. COMPUTER.
(2) DECELERATION SENSOR SIGNAL (FOR ALL–TRAC/4WD)
THE DEGREE OF VEHICLE DECELERATION IS DETECTED AND INPUT TO THE A.B.S. COMPUTER.
(3) STOP LIGHT SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL STP OF THE A.B.S. COMPUTER WHEN BRAKE PEDAL IS OPERATED.
(4) PARKING BRAKE SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL PKB OF THE A.B.S. COMPUTER WHEN THE PARKING BRAKE IS OPERATED.
2. SYSTEM OPERATION
DURING SUDDEN BRAKING THE A.B.S. COMPUTER, 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 COMPUTER JUDGES THAT THE HYDRAULIC PRESSURE ACTING ON THE WHEEL CYLINDER IS INSUFFICIENT, THE CURRENT
ACTING ON THE SOLENOID IS CONTROLLED AND THE HYDRAULIC PRESSURE IS INCREASED. HOLDING OF THE HYDRAULIC
PRESSURE IS ALSO CONTROLLED BY THE COMPUTER, BY THE SAME METHOD AS ABOVE. BY REPEATED PRESSURE REDUCTION,
HOLDING AND INCREASE ARE REPLATED TO MAINTAIN VEHICLE STABILITY AND TO IMPROVE STEERBILITY DURING SUDDEN
BRAKING.
A.B.S. COMPUTER
(CONNECT THE COMPUTER CONNECTOR)
(E) 1–GROUND, (E) 2–GROUND : APPROX. 12 VOLTS WITH IGNITION SW ON
APPROX 0 VOLT WITH IGNITION SW ON AND A.B.S. WARNING LIGHTS GOES ON
(E) 6–GROUND, (E)12–GROUND : APPROX. 12 VOLTS WITH IGNITION SW ON
APPROX 0 VOLT WITH IGNITION SW ON AND A.B.S. WARNING LIGHTS GOES ON
(F) 8–GROUND, (F)18–GROUND : APPROX. 12 VOLTS WITH IGNITION SW ON
APPROX 0 VOLT WITH IGNITION SW ON AND A.B.S. WARNING LIGHTS GOES ON
(F) 4–GROUND : APPROX. 12 VOLTS WITH A.B.S. CHACK CONNECTOR DISCONNECTED
APPROX. 0 VOLT WITH A.B.S. CHACK CONNECTSR CONNECTED
(DISCONNECT THE COMPUTER CONNECTOR)
(E) 1–(E) 12 : APPROX. 6 Ω WITH IGNITION SW OFF
(E) 6–(E) 12 : APPROX. 6 Ω WITH IGNITION SW OFF
(F) 8–(E) 12 : APPROX. 6 Ω WITH IGNITION SW OFF
(F) 18–(E) 12 : APPROX. 6 Ω WITH IGNITION SW OFF
(E) 3–GROUND : APPROX. 12 VOLTS WITH IGNITION SW OFF AND BRAKE PEDAL DEPRESSED
CONTINUITY WITH IGNITION SW OFF AND BRAKE PEDAL RETURNED
(E) 5–GROUND : APPROX. 0 VOLT WITH IGNITION SW ON AND PARKING BRAKE LEVER PULLED
APPROX. 12 VOLTS WITH IGNITION SW ON AND PARKING BRAKE LEVER RETURNED
(F) 4–GROUND, (F) 5–GROUND : CONTINUITY WITH IGNITION SW OFF
(F) 8–GROUND : (F) 16–GROUND : CONTINUITY WITH IGNITION SW OFF
(E) 9–(F) 10 : APPROX. 65–100 Ω WITH IGNITION SW OFF
(E) 10–(F) 10 : APPROX. 50–80 Ω WITH IGNITION SW OFF
(F) 11–GROUND : ALWAYS NO CONTINUITY
CONTINUITY WITH TS CONECTOR SHORTED
(E) 12–GROUND : (F) 14–GROUND : ALWAYS NO CONTINUITY
(E) 12–GROUND : APPROX. 5 Ω WITH IGNITION SW OFF
(F) 2–GROUND, (F) 3–GROUND : NO CONTINUITY WITH IGNITION SW OFF
(F) 10–GROUND : NO CONTINUITY WITH IGNITION SW OFF
(F) 6–GROUND : ALWAYS 12 VOLTS
(F) 7–GROUND : APPROX. 12 VOLTS WITH IGNITION SW ON
(F) 9–(F) 2 : APPROX. 0.85–1.30 KΩ
(F) 11–(F) 3 : APPROX. 0.85–1.30 KΩ
(F) 13–(F) 12 : APPROX. 0.85–1.30 KΩ
(F) 15–(F) 14 : APPROX. 0.85–1.30 KΩ
SYSTEM OUTLINE
SERVICE HINTS