1994 TOYOTA CAMRY ABS ECU

210
ABS (ANTI±LOCK BRAKE SYSTEM) (TMC MADE)
A B
A
E4
E6
I25E4 EC1 7EC1 3
IR2 6IR27IR25M
2 1 A 23 A24 A11 A1A13 A26 A14 A18 A6 B 4A1A4A3A6A2A5B1 A 5 A 1 B 4 B 2B3
A 2A15 A22 A10 A3A16B 3
B 1A2A4
A6
A 9
2 1
EAR±L
FR+ FR± FS S FL+ FL ± GND E
W±L W±L W±L
W±LG± W W±R
GR±L
GR±R
GR±G
L±W
G±W
L±R
G±R
R
R±W
W±R
W±BW±B
W±B W±B
W±B
BR BR R G W±B
B
W
W
W±B1FUSE BOX
60A ABS
ABS RELAY
ABS ACTUATOR
R±L
R± SR MR SFR SFL SRR SRL AST MT
ABS SPEED SENSOR
FRONT LHABS SPEED SENSOR
FRONT RH
W±B
(
SHIELDED)(
SHIELDED) ABS ECU FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
A1 3 , A 1 4 BA A6 , A7
B A4 , A5
A8 A9 F1 8
W±R
W±B
G
R

211
*
2 : CANADA *1 : USA
A
A
A
2G
II1 4 IR2 2IR2 1IR24
IS1 6 IS1 5 IS1 4 IJ1 6 IJ1 19 IJ1 12
1 2 1 2I21 I21 B 1B9B7B
16 B8B14A 25 A 12 B 6 B 13 A 5 B 4A 6
B
4
11 IP3 8IP33
B 15
RL± RL+ RSS RR± RR+ PKB
BR ABS TC TC TS WA R±LFROM POWER SOURCE SYSTEM(
SEE PAGE 64)
R±L
B±R
L±Y B±R
L±Y B±R
L±Y G±W G±WG±BR±G LG±RR±L
LG±R
G±BG±BY±B
LG±R LG±R
R±G
R±YY±B G
R R G
BR
YBR
Y
R±W R±W R±WR±W
11 16 22 4 1423
D/G TC TS W STP IG1 BATWB
DATA LINK
CONNECTOR 2
(
TDCL)
DATA LINK CONNECTOR 1
(
CHECK CONNECTOR)
C C
ABS WARNING LIGHT
[COMB. METER]
ABS SPEED SENSOR
REAR LH(
SHIELDED)
(
SHIELDED)
ABS SPEED SENSOR
REAR RH
PARKING BRAKE
SW
PARKING BRAKE
SW(
1MZ±FE)
ABS ECU
JUNCTION
CONNECTOR
R±LC CJ1
JUNCTION
CONNECTORJ3
C9 ,C10
B
A13 , A14
B
BR BR
BR
A19 A20
P2
P3(
5S±FE)
D1
D3
SHORT PIN
STOP LIGHT SW
G±R
G±W
2 1
S10
B
1 A 2
B 2B1
NOISE FILTER
(
FOR STOP LIGHT) N2 , N3
A
G±W
G±R
IP1 3
(
*1)
(
*
1) B
(
*2)
W
(
*2)
(
SHIELDED)
(
SHIELDED)
1A 151M 6
1B 61M31A73 10A
GAUGE15A
ECU±B 15A
ECU±IG 15A
STOP
3C 73C 19
3D 17
3C 173D 16
3C 133C 33C12
3C 15 3B23B 11 3C 16
3B 3
3D 8 3C 8

212
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 W
(A)2±GROUND : APPROX. 5 W
A 6(B), A 7(A) ABS RELAY
(A)1±(B) 3 : 60 W±100 W
(A)4±(B) 3 : 60 W±100 W
(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 KW
A19, A20 ABS SPEED SENSOR REAR LH, RH
1±2 : 1.1 K±1.5 KW
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

214
ABS (ANTI±LOCK BRAKE SYSTEM) (TMM MADE)
EC1 7
IR2 7IR26IR2 1 IR1 19
B 1A9B 2
A 11 A5A13 A7
IJ1 6IR2 5
I21 I14
1 21 2 B 2B1 A 2A1
2 1
FR+ FR± FL+ FL± +BS STPIG
W
B
R
GR
G
W±B W± B W±BB±R G±WW±L
G±W
G±R
B±R W± L
G±W
G±W
G± R
B±R
G±W
(
SHIELDED) (
SHIELDED)
(
SHIELDED)B A4 ,A5A
ABS ACTUATOR AND ECU FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
B N2 ,N3A
NOISE FILTER
(
FO R STO P L I G HT)
STOP LIGHT SW S10
W± B
A9 A8
ABS SPEED SENSOR
FRONT RHABS SPEED SENSOR
FRONT LH FUS E BO X F18
60A ABS
11M 31A7 15A
STOP15A
ECU±IG
1A 151M 6
3C 19
3C 7
3C 153C 16

215
C C IP3 8IP13EC13IP33
IR1 20 IR23IR28
IJ 1 19 IJ112 IS14IS16IS15 IR1 13A 12 A15 B3A1
A 4A2A6A14 B4 I13
B 4A 6
2 12 1
EA C C
RL+ RL± RR+ RR± GNDTC TS TC ABS
IR2 2IR112 IR24 11 16 23 22WA WB
I13 G±B G±B
TC TS LP W
R
G
W
B R
G R
G
W
BW
B
W±B W±B
W±BW±B
LG±R
R±G
G±B G±BLG±R
R±G
G±WLG±R
G±B G± B
R±L R±LY±B Y±B
R±G
G±W
G±B LG±R
4 14
A1 9A20 J3D3
J1 DATA LINK
CONNECTOR 2
(
CHE CK
CONNECTOR)
JUNCTION
CONNE CTORJUNCTION
CONNECTOR SHORT PIN
ABS SPEED SENSOR
RE AR RHABS SPEED SENSOR
REAR LH DATA LINK CONNE CTOR 1
(
CHECK CONNECTOR) D1
(
SHIELDED) (
SHIELDED) (
SHIELDED)(
SHIELDED)
(
SHIELDED)
(
SHIELDED)B C9 ,C10
A
B A4 ,A5AABS WARNING
LIGHT
(
COMB. LIGHT)
ABS ACTUATOR AND ECUFROM POWER SOURCE SYSTEM(
SEE PAGE 64)
3C 17 3D 17 3D163C 13 3C12 3C 3
10A
GAUGE
1B 6

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 KW
A19, A20 ABS SPEED SENSOR REAR LH, RH
1±2 : 1.1 K±1.5 KW
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

236
COMBINATION METER
AB
IJ1 5IJ111 IJ118
BX1 3 BX1 2 BX1 1 IP3 2
IP3 6
IP1 8IP 3 11 IP314
IP3 5
IP3 161
ED1 A 4
A 8A7A6A 5A12 B 11 B7B10 C 8C7C 4
123
23
4
1 I9
I9 C C
6 FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
R±L
R±L R±L R±L
BRY±L Y±R
BR BR BR Y±L Y±R Y±R
Y±L
BR
BR BR
B Y±G
BY±G
B
P
LG GG±B
G±B G±B
R±W
Y±B Y±BV±Y
R±L JUNCTION
CONNECTOR
BR
BR
FROM E NGINE CONTROL MODULE
(
E NGINE A ND E LE CTRONIC CONTROLLED
TRANSMISSION ECU)(
A/T)
FROM E NGINE CONTROL MODULE
(
ENGINE ECU)(
M/T)
FROM CRUISE CONTROL ECU
SPEEDFUEL
FUEL
WATER TEMP.
TA CHO
ABS
SEAT BELT
OIL
FUEL SENDER
WATER TEMP.
SENDER
IGNITER
VEHICLE SPEED
SENSOR
(
SPEED SENSOR)
TO AB S ECU
TO INTEGRATION
RELAY
OIL P RES SURE
SW
J2
B
W2
I2
V5
O1F1 5C
COMBINATION METER C8 ,C9 , C10
TO BACK±UP LIGHT SW(
M/T)
TO PARK/NEUTRAL POSITION SW
(
NEUTRAL START SW)(
A/T)
TO GENERA TOR(
ALTERNATOR) R±L
R±L
I18 6
TA C
COOLING FAN
ECU C14
BR
B
B JUNCTION CONNECTOR J7
(
*6) (
*6)
(
*7)A
A
(
*7)
(
*6)
1B 6 1D 610A
GAUGE
3D 13
3D 12
1D 121D 13
3C 133C 12

258
GROUND POINT
FRONT TURN SIGNAL
LIGHT RHABS ACTUATOR
FRONT CLEARANCE
LIGHT RH
FRONT SIDE MARKER
RH
FRON WIPER MOTOR
FRONT CLEARANCE
LIGHT LH
FRONT SIDE MARKER
LH
FRONT TURN SIGNAL
LIGHT LH
RADIATOR FAN MOTOR
HE ADLIGHT LO RH
HE ADLIGHT LO LH
ENGINE CONTROL
MODULE(
ENGIN AND
ELECTRONIC
CONTROLLED
TRANSMISSION ECU)
(
A/T)
ENGINE CONTROL
MODULE(
ENGINE ECU)
(
M/T)
NOISE FILER(
FOR
IGNI TI ON SYS TE M)
OXYGEN SENSORABS RELAY
ABS ECU
ABS ACTUATOR
AND ECU
DAYTIME RUNNING
LIGHT RELAY NO. 3
DAYTIME RUNNING
LIGHT NO. 4
CRUISE CONTROL
ACTUATOR
ENGINE MAIN RELAY
EFI MAIN RELAY
RADIATOR FAN RELAY
NO. 2
EC ED E4
E4
E4
E4
E4
E4I25 E6
EBEA
E5 EB15
EA125 7 7 7 7
2B2
5 2E4
E3 W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B W±B W±B W±B W±B
W±B
W±B
W±B(
*1)
W±B(
*1) W±B
W±B W±B
W±B W±B W±B
(
E)
(
GND)
(
GND)
(
CA NADA)
W±B
W±B
W±B W±B
W±B W±B
(
5S±FE)
E17
IP3 16IJ 1 18
BX13 I9 I9RADIATOR FAN RELAY
NO. 3
WATER TEMP. SW
(
FOR COOLING FAN)
A/C SINGLE
PRESSURE SW
DATA LINK
CONNECTOR 1
(
CHECK CONNECTOR)
DATA LINK
CONNECTOR 2(
TDCL)
COMBINATION METER
FUEL SENDER
ENGINE CONTROL
MODULE(
ENGINE
A ND ELE CTRONIC
CONTROLLED
TRANSMISSION
ECU)(
A/T)
ENGINE CONTROL
MODULE(
ENGINE
ECU)(
M/T) E5
E5
E5 BR
BR
BR (
E1)
W±BBR BR BR BR
BR
BR BR
BR BR
BR
BR
W±B
W±BBR W±BW±B W±B
BR
(
5S±FE)(
5S±FE)W±B W±B
W±BW±B W±B W±B
(
5S±FE)
(
5S±FE)
(
5S±FE)
(
1MZ±FE)
(
5S±FE)
BR
(
E01)
(
E02) W±B
BRW±B(
*1) W±B(
*1)
W±B(
*2)
W±B
3D13 3D3
3D 12