
218
ABS (ANTI–LOCK BRAKE SYSTEM) (TMM 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.
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 8, A 9
ABS SPEED SENSOR FRONT LH, RH
1–2 : 0.8 K–1.3 K
Ω
A19, A20
ABS SPEED SENSOR REAR LH, RH
1–2 : 1.1 K–1.5 K
Ω
A 4(A), A 5(B)
ABS ECU
(CONNECT THE ECU CONNECTORS)
(A)12–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND DATA LINK CONNECTOR 1 (CHECK CONNECTOR)
TS–EI NOT CONNECTED
(A)15–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND DATA LINK CONNECTOR 1 (CHECK CONNECTOR)
TS–EI NOT CONNECTED
(B) 4–GROUND
: ALWAYS CONTINUITY
(B) 2–GROUND
: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(A) 9–GROUND
: APPROX. 12 VOLTS WITH BRAKE PEDAL DEPRESSED
(B) 1–GROUND
: ALWAYS APPROX. 12 VOLTS
SYSTEM OUTLINE
SERVICE HINTS
Содержание 1994 CAMRY
Страница 18: ...Instrument Panel 18 RELAY LOCATIONS Engine Compartment...
Страница 19: ...Sedan Coupe Wagon 19 Body...
Страница 20: ...20 RELAY LOCATIONS J B No 1 Instrument Panel Left See Page 18...
Страница 21: ...21 J B No 1 Inner Circuit...
Страница 22: ...22 RELAY LOCATIONS J B No 2 Engine Compartment Left See Page 18...
Страница 23: ...23 J B No 2 Inner Circuit...
Страница 24: ...J B No 3 Inner Circuit 24 RELAY LOCATIONS J B No 3 Behind Combination Meter See Page 18...
Страница 25: ...25 1 R B No 1 Left Kick Panel See Page 18 4 R B No 4 Right Kick Panel See Page 18...
Страница 27: ...27 7 R B No 7 Near The Battery See Page 18...
Страница 37: ...ELECTRICAL WIRING DIAGRAM Memo...
Страница 63: ...POWER SOURCE Current Flow Chart Memo 37...
Страница 67: ...67...
Страница 71: ...71...
Страница 75: ...75...
Страница 87: ...87...
Страница 96: ...96 ENGINE CONTROL 5S FE A T AND CALIFORNIA M T 1 CALIFORNIA 2 EX CALIFORNIA...
Страница 97: ...97 ENGINE CONTROL 5S FE M T EX CALIFORNIA...
Страница 111: ...111...
Страница 116: ...116 TURN SIGNAL AND HAZARD WARNING LIGHT S D C P...
Страница 117: ...117 TURN SIGNAL AND HAZARD WARNING LIGHT W G...
Страница 122: ...122 STOP LIGHT S D C P...
Страница 123: ...123 STOP LIGHT W G...
Страница 129: ...129...
Страница 133: ...133...
Страница 137: ...137...
Страница 143: ...143...
Страница 172: ...172 UNLOCK AND SEAT BELT WARNING...
Страница 179: ...179...
Страница 195: ...195...
Страница 208: ...208 ELECTRONIC CONTROLLED TRANSMISSION AND A T INDICATOR 5S FE...
Страница 209: ...209 ABS ANTI LOCK BRAKE SYSTEM TMC MADE...
Страница 217: ...217...
Страница 219: ...ABS ANTI LOCK BRAKE SYSTEM TMM MADE Memo 37...
Страница 240: ...240 COMBINATION METER...
Страница 251: ...251...
Страница 262: ...HOW TO USE THIS MANUAL 262 OVERALL ELECTRICAL WIRING DIAGRAM...