TOYOTA SUPRA 1986 Service Repair Manual

163
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A 6A26 (2JZ±GE)A18B28C12B28
A 7B26 (2JZ±GE)A19A28D 126 (2JZ±GE)
A 8A26A2328D 528
A 9B26A3130P 529
A1026 (2JZ±GE)A3230S1129
A1126 (2JZ±GE)C10A28T 529
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E20INSTRUMENT PANEL WIRE AND J/B NO.1 (LEFT KICK PANEL)
1H
1I20COWL WIRE AND J/B NO.1 (LEFT KICK PANEL)
1K
20COWL WIRE AND J/B NO.1 (LEFT KICK PANEL)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EA134 (2JZ±GE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE (NEAR THE R/B NO. 2)
IB536ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)IB636ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
IC236FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)
IF136INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)IF236INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)
II138ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IJ138ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA34 (2JZ±GE)FRONT SIDE OF RIGHT FENDER
IG36RIGHT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E1834ENGINE ROOM MAIN WIREI1438INSTRUMENT PANEL WIRE
I 238COWL WIREI18
I 438COWL WIREI2038COWL WIRE
I 538INSTRUMENT PANEL WIREI22
38COWL WIRE

164
ABS AND TRACTION CONTROL
22
55 55 5 55 5 55 55 55555 555
E5 E5 E2
E5 24 13
23 14
43 61
2
43 61
2
MIB5 16
EBEAG±B
W±G
R±W
L
L±W
V±Y
B±R V±YRLG±R
V
L±B
B±R
V±Y
Y L±Y
G±B
V±Y
L
V±Y V±Y
V±Y
V±Y
R B±R R R
V
B±R
W±BL±W
R±W
W±B W±B
B±R W±B
W±G
L
V±Y
G±B
LG±R
30A
ABS
NO. 260A
ABS
NO. 1
55 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
ABS SOLENOID
RELAY
TRACTION SOLENOID
RELAY ABS MOTOR
RELAY TRACTION
MOTOR RELAY
TRACTION
PUMP AND
MOTOR
R
3
12T4 22
R
E6
V±YV±Y
IB6 13
V±Y
11

165
IB6 18 IB61IB62
A 1A15 A2B13 B15 B6B4B5B7B8B11 B14
A 14 A22 C8C2A9C1A13 A26 C7A21A 9 A 21 A 16 A 22 A 4 A 7 A 19 A 6 A 20 I22
A 23
IB6 14 IB34IB210 IB211 IB66IB57IB58IB59IB510 IB65
B 5B1B4B3B6B2
A 3A1A4 M
EA E8
G±B
W± G
V±Y
V
L±W
Y
B±Y
P
P±B
Y±G Y±GP± BP B± YY L±W R±W
R±W
L
W±B
L±WV± Y
V
LG±B
O
Y±B
GR±R
P±B
P±G
V±R
B±Y
R±W V L± B B±R B±R
L±B
V
B±RL±BV LG±RLG±R
LG±R
V±Y
B± R B±RV±Y L±WL R±W W±GG±B
ABS ACTUATOR ABS AND TRACTION ECUB A20 , A21AC,A22
TRACTION
BRAKE
ACTUATORTRACTION ECU B T9 ,T10
A
T3WT FRO FLO RRO RLO BRFA THFA BRC TRCO
43 21 TSR SR MRBRP TRCO
TMR MTT SRC SMC MT SFR SFL SRR SRL AST
W±G
B A6 , A7A FRO FLO RRO RLO BRFA THFA BRC
G±B
LG±R
BRP

166
ABS AND TRACTION CONTROL
A 26 A27 A13 A14 B64 B63 B41
B 16A 17 A10 B8B3B9B2B1B7
A 17 A4A5A18 B2B10 B9B1
IB5 3IB51IB52IB26IB24IB25IC29IC23IC28 IJ2 2
1 2
1 2
2 1
2 1
I9 I9 I9 I9
(
SHIELDED)
R
L
(
SHIELDED)
W
B
L
P
(
SHIELDED)
V
LG LGV (
SHIELDED) B W (
SHIELDED) L R (
SHIELDED) (
SHIELDED)
(
SHIELDED)
(
SHIELDED)R±B
P±L P±L
W
B
W±R
O
R
GR±R (
SHIELDED) ABS SPEED SENSOR
FRONT RH
ABS SPEED SENSOR
FRONT LH
ABS SPEED SENSOR
REAR RH
ABS SPEED SENSOR
REAR LH
ABS AND TRACTION ECUB A2 0 , A21
,A22 A ENGINE CONTROL MODULE
(
ENGINE A ND E LE CTRONICALLY
CONTROLLED TRANSMISSION ECU) B E10 , E 9ATRACTION ECUB T9 ,T10A
NEO EFI± EFI+ TRC± TRC+ IDL1 IDL2
VCC IDL2 IDL1 TRC+ TRC± EFI+ EFI±
ABSO
RL± RL+ RR± RR+ FL ± FL + FR± FR+
B±R V±Y LG±R LG±R
A11
A10
A32
A31
V±Y
B±RV±Y V±Y V±YC B 12IJ 1 14A 38 A 11
1234
VC VTA IDL E2 E16
B 65 B 42
GR±R
L±R
BR±B
BR±B
GR±R
Y±L
L±RY±L Y±R
Y±R
VTA2 E2
EXO±+
ABS NEO
SUB THROTTLE
POSITION SENSOR S5
ABSO

167
B 6B5B4B10 B11 B12 A12 A26 A3A11 A18
I4
I4
I4
I4
I4 A 12 A25 C4C9A10 C10 A11 A8A20 A6 A 7A24 C6A23 C12 IJ2 8
I11
I18
IG EB2 1
1 2C 5 546312TC STP IG1 BAT BCM B± B A A± ACM
WA STP IG1 BAT
GST GS2 GS1 TS D/G LBL GND GND GND R±ABS AND TRACTION ECUB A2 0 , A2 1 , A 2 2AC SUB THROTTLE ACTUATOR S4 ACM A± A B B± BCM
BRAKE FLUID LEVEL
WARNING SW
DIODE B2(
SHIELDED)
BR
G
W
L
R
Y
(
SHIELDED)
W±R
B±R
G±W
P±B
BR±W W±R
B±R
G±W
P± B
BR±W
L W±LR±L B±OY V±GR±W W±B W±B
W±BV±Y
W±B
W±B
W±B
B±W
BR±WW±B
R±W R±W R±W
IB2 14
(
CANADA)
(
USA)
V±Y
B±R LG±RLG±R
W±R
B±R
G± W
P±B
BR±W
L
W±B
W±L
R± L
B±O
Y
V±G
BR±W
B±W
B±R TRACTION ECUB T9 ,T10A
(
CANADA) (
US A)
W±B
I4:USA
I10 : CANADA
W±B
PKB
TC PKB
4
4

168
ABS AND TRACTION CONTROL
I4
I4
I2 I22
IJ1 16 II121IF111
2 1 A 14 A5A13 A24
IJ1 15
I18 I11
IG
W±BW±L
R±L
B±O
W±B
Y
B±R
W±B
W±B
V±GL
P±B
LG
P±B
WL B±R
P± B
WW±B
LG
L±Y
W
L±Y
W±R
B±R
G±W
BR±W
L
W LG±R LG±R
W±R
B±R
G±W
P±B
BR±W
L
W±B
W±L
R±L
B±O
Y
V±G
BR±W
B± W
B±RB±W BR±W W±B W±BP±B P±BGND CSW BM IND
GST GS2 GS1 GND
TSABS IG1TC TRC TRACTION ECU
ABS LATERAL ACCELERATION
SENSOR
WB WA TC
Y
1236
1614 42211 417
23
(
US A)
(
CANADA) (
USA)
(
CANADA)B T9 ,T10A
DATA LINK CONNECTOR 1
(
CHECK CONNECTOR)
TRAC OFF SW
DATA LINK CONNECTOR 2
(
TDCL) D1
T8
D5
I20
W±B
A2 3
EA1 6
B±R(
SHORT PIN)
IE
W±B

169
7. 5A
TRAC10A
ECU±B10A
ECU±IG15A
STOP10A
GAUGE
21H1K1I1E
1 2
IF2 2IF212 IF21IF115I14
I2 IB 3 3FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
A 9
B 7B1
1
I2 LG±R
L±Y
W±R
B±R
G±W
BR±W
L
W
BR±W
B±WSTOP LIGHT
SW
TRAC BRAKE ABS TRA C
OFF TELLTALE
LIGHT LHCOMBINATION
METER
PARKING
BRAKE SWDAYTIME
RUNNING
LIGHT
RELAY
(
MAIN) LG±R
L
W
BR±W
BR±WG±W
Y
BR±W
(
USA)
(
USA)
(
CANADA)(
CANADA) (
USA)
BR±W BR±WW
L
LG±R
BR±W
LG±R
L
W
BR±WY
YL±Y
W±R
B±R
W
Y
842
W
BR±W
B±W (
USA)
(
CANADA) B±W
(
CA NADA)
OIL PKB
188 T5
D6
P58131012
B±W
(
CANADA) S11
B C10 , C12
A
I2:USA
I10 : CANADA1
2

170
ABS AND TRACTION CONTROL
(FOR ABS)
THIS SYSTEM CONTROLS THE RESPECTIVE BRAKE FLUID PRESSURES ACTING ON THE DISC BRAKE CYLINDERS OF THE RIGHT
FRONT WHEEL, LEFT FRONT WHEEL, RIGHT REAR WHEEL AND LEFT REAR WHEEL WHEN THE BRAKES ARE APPLIED IN A PANIC
STOP SO THAT THE WHEELS DO NOT LOCK.
THIS RESULTS IN IMPROVED DIRECTIONALLY 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 AND TRACTION
ECU.
(2) STOP LIGHT SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL STP OF THE ABS AND TRACTION ECU WHEN THE BRAKE PEDAL IS DEPRESSED.
(3) PARKING BRAKE SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL PKB OF THE ABS AND TRACTION ECU WHEN THE PARKING BRAKE LEVER IS PULLED UP.
(4) DECELERATION SENSOR SIGNAL
LATERAL ACCELERATION IS DETECTED AND INPUT TO THE ABS AND TRACTION ECU.
2. SYSTEM OPERATION
DURING SUDDEN BRAKING, THE ABS AND TRACTION 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.
(FOR TRACTION CONTROL)
THE TRACTION CONTROL SYSTEM IS A SYSTEM WHEREBY THE ªABS AND TRACTION ECUº AND ªTRACTION ECUº CONTROLS THE
ENGINE TORQUE AND THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER OF THE DRIVING WHEELS IN ORDER TO CONTROL
SPINNING OF THE DRIVING WHEELS WHEN STARTING OFF AND ACCELERATING, AND PROVIDE THE MOST APPROPRIATE DRIVING
FORCE IN RESPONSE TO THE ROAD CONDITIONS FOR VEHICLE STABILITY.
TRACTION CONTROL OPERATION
VEHICLE SPEED SIGNALS FROM THE SPEED SENSOR INSTALLED ON EACH WHEEL ARE INPUT TO THE ABS AND TRACTION ECU.
WHEN THE ACCELERATOR PEDAL IS DEPRESSED WHILE DRIVING ON A SLIPPERY ROAD AND THE DRIVING WHEEL (REAR WHEEL)
SLIPS, IF THE ROTATION OF THE REAR WHEEL EXCEEDS THE ROTATION OF THE FRONT WHEELS FOR A SPECIFIED PERIOD, THE
ECU JUDGES THAT THE REAR WHEEL IS SLIPPING.
WHEN THIS OCCURS, CURRENT FLOWS FROM TRACTION ECU TO SUB THROTTLE ACTUATOR TO CLOSE THE SUB THROTTLE
VALVE. AT THE SAME TIME, OPERATION OF THE ABS AND TRACTION ECU CAUSE THE TRACTION BRAKE ACTUATORS (MASTER
CYLINDER CUT, RESERVOIR CUT SOLENOID) TO TURN ON TO SWITCH THE HYDRAULIC CIRCUIT TO ªTRACTIONº MODE.
IN THIS CASE, SIGNALS ARE INPUT FROM TERMINAL SRR OF ABS AND TRACTION ECU TO TERMINAL (B)3 OF ABS ACTUATOR, AND
FROM TERMINAL SRL OF ABS AND TRACTION ECU TO TERMINAL (B)6 OF ABS ACTUATOR, CONTROLLING THE REAR WHEEL
SOLENOID IN THE ABS ACTUATOR AND INCREASING THE HYDRAULIC PRESSURE OF THE WHEEL CYLINDER IN ORDER TO
PREVENT SLIP.
TO MAINTAIN THE HYDRAULIC PRESSURE OF THE REAR WHEELS, THE REAR WHEEL SOLENOID INSIDE THE ABS ACTUATOR IS
PUT IN ªHOLDº MODE AND KEEPS THE HYDRAULIC PRESSURE TO THE WHEEL CYLINDER CONSTANT.
WHEN THE AMOUNT OF SLIP HAS DECREASED, THE HYDRAULIC PRESSURE IN THE WHEEL CYLINDER DECREASES.
SYSTEM OUTLINE

171
A20 (A), A21 (B), A22 (C) ABS AND TRACTION ECU
(A) 7±GROUND : ALWAYS 10±14 VOLTS
(A) 24±GROUND : 10±14 VOLTS WITH IGNITION SW AT ON POSITION
(C) 6±GROUND : 10±14 VOLTS WITH STOP LIGHT SW ON
(A) 25, (C) 4, (C) 9±GROUND : ALWAYS CONTINUOUS
(C) 12±GROUND : 10±14 VOLTS WITH PARKING BRAKE LEVER PULLED UP (PARKING BRAKE SW ON)
A 6 (A), A 7 (B) ABS ACTUATOR
(A) 1±GROUND : ALWAYS CONTINUOUS
(B) 1, (B) 3, (B) 4, (B) 6±GROUND : APPROX. 1.2
(IGNITION SW OFF)
(B) 2±GROUND : 4±6
(IGNITION SW OFF)
T 3 TRACTION BRAKE ACTUATOR
1±3 : APPROX.2.1

2±4 : APPROX.2.1

S11 STOP LIGHT SW
2±1: CLOSED WITH BRAKE PEDAL DEPRESSED
A10, A11, A31, A32 ABS SPEED SENSOR FRONT LH, RH, REAR LH, RH
1±2: 0.8± 1.3 K
(20°C, 68°F)
T 9(A), T10(B) TRACTION ECU
(A)26±GROUND:10±14 VOLTS WITH IGNITION SW AT ON POSTION
(A)13±GROUND: ALWAYS 10±14 VOLTS
(A)14±GROUND: ALWAYS BELOW 1 VOLTS
(A)18±GROUND:10±14 VOLTS WITH IGNITION SW ON PARKING BRAKE LEVER RELEASED (PARKING BRAKE SW OFF)
(A) 3±GROUND:10±14 VOLTS WITH STOP LIGHT SW ON
(A) 5±GROUND:10±14 VOLTS WITH TRAC OFF SW RELEASED
(A)12±GROUND: ALWAYS 10±14 VOLTS
P 5 PARKING BRAKE SW
1±GROUND : CLOSED WITH PARKING BRAKE LEVER DEPRESSED
S 4 SUB THROTTLE ACTUATOR
2±1, 2±3 : APPROX. 1.1

5±4, 5±6 : APPROX. 1.1

: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A 6A24 (2JZ±GTE)B 224 (2JZ±GTE)S 525
A 7B24 (2JZ±GTE)C10A28S1129
A1024 (2JZ±GTE)C12B28T 325
A1124 (2JZ±GTE)D 124 (2JZ±GTE)T 425
A20A28D 528T 529
A21B28D 628T 829
A22C28E 9B29T 9A29
A2328E10A29T10B29
A3130P 529
A3230S 425
SERVICE HINTS

172
ABS AND TRACTION CONTROL
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
423R/B NO. 4 (LEFT KICK PANEL)
523R/B NO. 5 (ENGINE COMPARTMENT RIGHT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E20INSTRUMENT PANEL WIRE AND J/B NO.1 (LEFT KICK PANEL)
1H
1I20COWL WIRE AND J/B NO.1 (LEFT KICK PANEL)
1K
20COWL WIRE AND J/B NO.1 (LEFT KICK PANEL)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EA132 (2JZ±GTE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE (NEAR THE R/B NO. 2)
IB236ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)IB336ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)
IB536ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)IB636ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
IC236FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)
IF136INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)IF236INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)
II138ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IJ138ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)IJ238ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA32 (2JZ±GTE)FRONT SIDE OF RIGHT FENDER
EB32 (2JZ±GTE)FRONT SIDE OF LEFT FENDER
IE36LEFT KICK PANEL
IG36RIGHT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E 2I 9
E 532ENGINE ROOM MAIN WIREI1038COWL WIRE
E 632ENGINE ROOM MAIN WIREI11
38COWL WIRE
E 8I1438INSTRUMENT PANEL WIRE
E1632ENGINE WIREI18
1 238COWL WIREI2038COWL WIRE
1 438COWL WIREI22
38COWL WIRE