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ABS (ANTI–LOCK BRAKE SYSTEM) (TMC MADE)
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 BRAKEING.
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 BRAKE PEDAL IS OPERATED.
(3) PARKING BRAKE SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL PKB OF THE ABS ECU WHEN THE PARKING BRAKE IS OPERATED.
2. SYSTEM OPERATION
DURING SUDDEN BRAKEING 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 THE 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 REPLATED TO MAINTAIN VEHICLE STABILITY AND TO IMPROVE STEERBILITY DURING SUDDEN
BRAKING.
A 4(A), A 5(B) ABS ACTUATOR
(A)1, (A)3, (A)4, (A)6 – (A)2 : APPROX. 6 Ω
(A)2–GROUND : APPROX. 5 Ω
A 6(B), A 7(A) ABS RELAY
(A)1–(B) 3 : 60 Ω–100 Ω
(A)4–(B) 3 : 60 Ω–100 Ω
(A)1, (B) 2–GROUND : APPROX. 12 VOLTS
(A)6–GROUND : APPROX. 12 VOLTS
A 8, A 9 ABS SPEED SENSOR FRONT LH, RH
1–2 : 0.8 K–1.3 KΩ
A19, A20 ABS SPEED SENSOR REAR LH, RH
1–2 : 1.1 K–1.5 KΩ
A13(A), A14(B) ABS ECU
(CONNECT THE ECU CONNECTORS)
(A) 5–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND DATA LINK CONNECTOR 1 (CHECK CONNECTOR)
TS–EI NOT CONNECTED
(B)15–GROUND: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND DATA LINK CONNECTOR 1 (CHECK CONNECTOR)
TS–EI NOT CONNECTED
(A) 1–GROUND, (A) 13–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT GOES OFF
(A)14–GROUND, (A) 1–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT GOES OFF
(A)26–GROUND, (A) 18–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND ABS WARNING LIGHT GOES OFF
(A) 2–GROUND : ALWAYS CONTINUITY
(A)15–GROUND: ALWAYS CONTINUITY
(A)12–GROUND: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(B) 6–GROUND : APPROX. 12 VOLTS WITH BRAKE PEDAL DEPRESSED
(A)25–GROUND: ALWAYS APPROX. 12 VOLTS
SYSTEM OUTLINE
SERVICE HINTS