1986 TOYOTA SUPRA Service Repair Manual

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

173

174
CRUISE CONTROL
10A
ECU±B 10A
GAUGE
I14 I141H 8 1H 12 1E 12
II1 2II18II1 21IF1 11 II1 23 IJ27
IF24
I2I2 A 9 A 10
B 11 B62 1
4 9
IF 7578
312
10 4 1115 2 20
6 1YY
YG±R
P
Y
P±B
O
BR
L±R
Y
R
BR
O
O
P±B
P±B P±BP±BOY R RY BR
P Y
G±R Y
W±RYY Y
FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
A/T INDICATOR LIGHT SW
[PARK/NEUTRAL POSITION SW
(
NEUTRAL START SW)
]
(
A/T) P2
(
M/T)
C15
CRUISE CONTROL
CLUTCH S W
(
M/T)
(
M/T)
ODO AND TRIP
CRUISE
B C10 , C12A
COMBINATION METERTE LL TA LE L I GHT RH T6
V10
VEHICLE SPEED SENSOR
(
SPEED SENSOR)
NO. 1
(
FOR COMBINATION METER)A/D TC TC
DATA LINK CONNE CTOR 2
(
TDCL)DATA LINK CONNECTOR 1
(
CHECK CONNE CTOR) D5 D1 SPD D BATT
PI TCCRUISE CONTROL ECU C1610A
ECU±IG
1I 9
14
B±R
B (
A/T)
IF25
P Y
E14 : 2JZ±GTE
E28 : 2JZ±GE
I14
L±R L±RL±R
TO SPEED METER
[COMB. METER]
I4
G±R
G±R
(
A/T)
I8
BR

175
15A
STOP
I17
I4I21I 10
IJ2 10 IJ211 IJ13
IB6 10 IB67IB616 IB615 IB69IB617 IB68 A 8
B 2
B 64 A 12 B 9
11 2
3 4 MFROM POWER SOURCE SYSTEM(
SEE PAGE 56)
22 9 21
31 10 16 1236 745
23 24 25 12 11 26
W
B±W
W G±W IDL OD ECT
PKB STP+ L STP±
R±L BR±BG±RLG P±G LG±RR±B R±B
LG±R
P±G
LG
G±R
BR±B
R±L R±LW
W W W G±W G±WB±WW BR±WR BR±BR±L
RRBR±BR±L
R R±L
R±L
VR1 VR2 VR3
MO MC L±MC GND VR1VR2VR3MO CRUISE CONTROL ACTUATOR C4
B±W
TO LIGHT FAILURE
SENSOR
STOP LIGHT SW S11 P5
PARKING BRAKE SW
IDL S2
S2 OD1 IDL1THROTTLE
POSITION SENSOR
ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONICA LLY
CONTROLLED TRA NSMISSION ECU) ELECTRONICALLY CONTROLLED
TRANSMISSION SOLENOIDB E2 ,A
A E9 ,E10B
(
2JZ±GE) (
2JZ±GTE)
RES UME/
ACCEL
SET/
COAS T
CANCE L I4
1J 11H 13
IE18 19 13
L R±Y W±B W±B W±B
W±B 1715 5
CCS
ECMS
MAIN
C14
CRUISE CONTROL SW
[COMB. SW]CMS CCSE16 : 2JZ±GTE
I17 : 2J Z±GEA 3
B 2(
2JZ±GTE)
(
2JZ±GE)
(
A/T)
(
A/T) (
A/T) (
A/T)
(
A/T)(
A/T)
L
GND CRUISE CONTROL
ECU C16B T2 ,A

176
CRUISE CONTROL
CURRENT IS APPLIED AT ALL TIMES THROUGH STOP FUSE TO TERMINAL 1 OF THE CRUISE CONTROL ECU, TERMINAL 2 OF STOP
LIGHT SW, AND ALSO THROUGH THE ECU±B FUSE TO TERMINAL 15 OF CRUISE CONTROL ECU.
WITH THE IGNITION SW TURNED TO ON, THE CURRENT FLOWS THROUGH GAUGE FUSE TO TERMINAL (A)9 OF COMBINATION
METER AND THE CURRENT THROUGH ECU±IG FUSE FLOWS TO TERMINAL 14 OF CRUISE CONTROL ECU.
WHEN THE IGNITION SW IS ON AND THE CRUISE CONTROL MAIN SWITCH IS TURNED ON, A SIGNAL IS INPUT FROM TERMINAL 15
OF CRUISE CONTROL MAIN SW TO TERMINAL 19 OF CRUISE CONTROL ECU. AS A RESULT, THE CRUISE CONTROL ECU
FUNCTIONS AND THE CURRENT FLOWS THROUGH TERMINAL 14 OF CRUISE CONTROL ECU TO TERMINAL 13 OF CRUISE
CONTROL ECU "GROUND, AND THE CRUISE CONTROL SYSTEM IS IN A CONDITION READY FOR OPERATION.
AT THE SAME TIME, THE CURRENT THROUGH THE GAUGE FUSE FLOWS TO TERMINAL (A)9 OF CRUISE CONTROL INDICATOR
LIGHT "TERMINAL (B)6 "TERMINAL 7 OF CRUISE CONTROL ECU "TERMINAL 13 "GROUND. CAUSING THE CRUISE CONTROL
INDICATOR LIGHT TO LIGHT UP, INDICATING THAT THE CRUISE CONTROL IS READY FOR OPERATION.
1. SET OPERATION
WHEN THE CRUISE CONTROL MAIN SW IS TURNED ON AND THE SET SW IS PUSHED WITH THE VEHICLE SPEED WITHIN THE SET
LIMIT (APPROX. 40 KM/H, 25 MPH TO 200 KM/H, 124 MPH), A SIGNAL IS INPUT TO TERMINAL 18 OF THE CRUISE CONTROL ECU AND
THE VEHICLE SPEED AT THE TIME THE SET SW IS RELEASED, WHICH IS MEMORIZED IN THE ECU AS THE SET SPEED.
2. SET SPEED CONTROL
DURING CRUISE CONTROL DRIVING, THE ECU COMPARES THE SET SPEED MEMORIZED IN THE ECU WITH THE ACTUAL VEHICLE
SPEED INPUTS INTO TERMINAL 20 OF THE CRUISE CONTROL ECU FROM THE SPEED SENSOR, AND CONTROLS THE CRUISE
CONTROL ACTUATOR TO MAINTAIN THE SET SPEED.
WHEN THE ACTUAL SPEED IS LOWER THAN THE SET SPEED, THE ECU CAUSES THE CURRENT TO THE CRUISE CONTROL
ACTUATOR TO FLOW FROM TERMINAL 12 "TERMINAL 6 OF CRUISE CONTROL ACTUATOR "TERMINAL 7 "TERMINAL 11 OF
CRUISE CONTROL ECU. AS A RESULT, THE MOTOR IN THE CRUISE CONTROL ACTUATOR IS ROTATED TO OPEN THE THROTTLE
VALVE AND THE THROTTLE CABLE IS PULLED TO INCREASE THE VEHICLE SPEED. WHEN THE ACTUAL DRIVING SPEED IS HIGHER
THAN THE SET SPEED, THE CURRENT TO CRUISE CONTROL ACTUATOR FLOWS FROM TERMINAL 11 OF ECU "TERMINAL 7 OF
CRUISE CONTROL ACTUATOR "TERMINAL 6 "TERMINAL 12 OF CRUISE CONTROL ECU.
THIS CAUSES THE MOTOR IN THE CRUISE CONTROL ACTUATOR TO ROTATE TO CLOSE THE THROTTLE VALVE AND RETURN THE
THROTTLE CABLE TO DECREASE THE VEHICLE SPEED.
3. COAST CONTROL
DURING THE CRUISE CONTROL DRIVING, WHILE THE COAST SW IS ON, THE CRUISE CONTROL ACTUATOR RETURNS THE
THROTTLE CABLE TO CLOSE THE THROTTLE VALVE AND DECREASE THE DRIVING SPEED. THE VEHICLE SPEED WHEN THE COAST
SWITCH IS TURNED OFF IS MEMORIZED AND THE VEHICLE CONTINUES AT THE NEW SET SPEED.
4. ACCEL CONTROL
DURING CRUISE CONTROL DRIVING, WHILE THE ACCEL SW IS TURNED ON, THE CRUISE CONTROL ACTUATOR PULLS THE
THROTTLE CABLE TO OPEN THE THROTTLE VALVE AND INCREASE THE DRIVING SPEED.
THE VEHICLE SPEED WHEN THE ACCEL SW IS TURNED OFF IS MEMORIZED AND THE VEHICLE CONTINUES AT THE NEW SET SPEED.
5. RESUME CONTROL
UNLESS THE VEHICLE SPEED FALLS BELOW THE MINIMUM SPEED LIMIT (APPROX. 40 KM/H, 25 MPH) AFTER CANCELING THE SET
SPEED BY THE CANCEL SW, PUSHING THE RESUME SW WILL CAUSE THE VEHICLE TO RESUME THE SPEED SET BEFORE THE
CANCELLATION.
6. MANUAL CANCEL MECHANISM
IF ANY OF THE FOLLOWING OPERATIONS OCCUR DURING CRUISE CONTROL OPERATION, THE MAGNETIC CLUTCH OF THE
ACTUATOR TURNS OFF AND THE MOTOR ROTATES TO CLOSE THE THROTTLE VALVE AND THE CRUISE CONTROL IS RELEASED.
*PLACING THE SHIFT LEVER IN EXCEPT ªDº POSITION (PARK/NEUTRAL POSITION SW (NEUTRAL START SW EXCEPT ªDº POSITION)).
ªSIGNAL IS NOT INPUT TO TERMINAL 2 OF ECUº (A/T).
*DEPRESSING THE BRAKE PEDAL (STOP LIGHT SW ON). ªSIGNAL IS INPUT TO TERMINAL 16 OF ECUº
*PULLING THE PARKING BRAKE LEVER (PARKING BRAKE SW ON). ªSIGNAL INPUT TO TERMINAL 3 OF ECUº
*PUSHING THE CANCEL SWITCH (CANCEL SW ON). ªSIGNAL IS INPUT TO TERMINAL 18 OF ECUº
*DEPRESSING THE CLUTCH PEDAL (CRUISE CONTROL CLUTCH SW OFF). ªSIGNAL IS NOT INPUT TO TERMINAL 2 OF ECUº
SYSTEM OUTLINE

177
7. AUTO CANCEL FUNCTION
A) IF ANY OF THE FOLLOWING OPERATING CONDITIONS OCCUR DURING CRUISE CONTROL OPERATION, THE SET SPEED IS
ERASED, CURRENT FLOW TO MAGNETIC CLUTCH IS STOPPED AND THE CRUISE CONTROL IS RELEASED. (MAIN SW TURNS OFF).
WHEN THIS OCCURS, THE IGNITION SW MUST BE TURNED OFF ONCE BEFORE THE MAIN SW WILL TURN ON.
*OVER CURRENT TO TRANSISTOR DRIVING MOTOR AND/OR MAGNETIC CLUTCH.
*WHEN CURRENT CONTINUED TO FLOW TO THE MOTOR INSIDE THE ACTUATOR IN THE THROTTLE VALVE ªOPENº DIRECTION.
*OPEN CIRCUIT IN MAGNETIC CLUTCH.
*MOMENTARY INTERRUPTION OF VEHICLE SPEED SIGNAL.
*SHORT CIRCUIT IN CRUISE CONTROL SW.
*MOTOR DOES NOT OPERATE DESPITE THE MOTOR DRIVE SIGNAL BEING OUTPUT.
B) IF ANY OF THE FOLLOWING CONDITIONS OCCUR DURING CRUISE CONTROL OPERATION, THE SET SPEED IS ERASED AND
THE CRUISE CONTROL IS RELEASED. (THE POWER OF MAGNETIC CLUTCH IS CUT OFF UNTIL THE SET SW IS ªONº AGAIN.)
*WHEN THE VEHICLE SPEED FALLS BELOW THE MINIMUM SPEED LIMIT, APPROX. 40 KM/H (25 MPH)
*WHEN THE VEHICLE SPEED FALLS MORE THAN 16 KM/H (10 MPH) BELOW THE SET SPEED, E.G. ON AN UPWARD SLOPE.
*WHEN POWER TO THE CRUISE CONTROL SYSTEM IS MOMENTARILY CUT OFF.
C) IF ANY OF THE FOLLOWING CONDITIONS OCCUR DURING CRUISE CONTROL OPERATION, THE CRUISE CONTROL IS
RELEASED.
*OPEN CIRCUIT FOR TERMINAL 1 OF CRUISE CONTROL ECU AND TERMINAL 2 OF STOP LIGHT SW.
8. AUTOMATIC TRANSMISSION CONTROL FUNCTION
*IN OVERDRIVE. IF THE VEHICLE SPEED BECOMES LOWER THAN THE OVERDRIVE CUT SPEED (SET SPEED MINUS APPROX. 4
KM/H, 2.5 MPH) DURING CRUISE CONTROL OPERATION, SUCH AS DRIVING UP A HILL, THE OVERDRIVE IS RELEASED AND THE
POWER INCREASED TO PREVENT A REDUCTION IN VEHICLE SPEED.
*AFTER RELEASING THE OVERDRIVE, VEHICLE SPEED BECOMES HIGHER THAN THE OVERDRIVE RETURN SPEED (SET SPEED
MINUS APPROX. 2 KM/H, 1.2 MPH) AND THE ECU JUDGES BY THE SIGNALS FROM POTENTIONMETER OF THE ACTUATOR THAT
THE UPWARD SLOPE HAS FINISHED, OVERDRIVE IS RESUMED AFTER APPROXIMATELY 2 SECONDS.
*DURING CRUISE CONTROL DRIVING, THE CRUISE CONTROL OPERATION SIGNAL IS OUTPUT FROM THE CRUISE CONTROL
ECU TO THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU). UPON RECEIVING
THIS SIGNAL, THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) CHANGES
THE SHIFT PATTERN TO NORMAL.
TO MAINTAIN SMOOTH CRUISE CONTROL OPERATION (ON A DOWNWARD SLOPE ETC.), LOCK±UP RELEASE OF THE
TRANSMISSION WHEN THE IDLING POINT OF THE THROTTLE POSITION IS ªONº IS FORBIDDEN.
C 4 CRUISE CONTROL ACTUATOR
1±3 : APPROX. 2 K

5±4 : APPROX. 38.5

C14 CRUISE CONTROL SW [COMB.SW]
15±17 : CONTINUOUS WITH MAIN SW ON
5±17 : APPROX. 418
WITH CANCEL SW ON
: APPROX. 68
WITH RESUME/ACCEL SW ON
: APPROX. 198
WITH SET/COAST SW ON
C16 CRUISE CONTROL ECU
14±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
1, 15±GROUND : ALWAYS APPROX. 12 VOLTS
3±GROUND : CONTINUOUS WITH PARKING BRAKE LEVER PULLED UP (ONE OF THE CANCEL SW)
20±GROUND :4 PULSE WITH 1 ROTATION OF ROTOR SHAFT
18±GROUND : APPROX. 418
WITH CANCEL SW ON IN CONTROL SW
: APPROX. 198
WITH SET/COAST SW ON IN CONTROL SW
: APPROX. 68
WITH RESUME/ACCEL SW ON IN CONTROL SW
13±GROUND : ALWAYS CONTINUOUS
SERVICE HINTS

178
CRUISE CONTROL
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C424 (2JZ±GTE)D 126 (2JZ±GE)P 529C 426 (2JZ±GE)D 528S1129
C10A28E2A24 (2JZ±GTE)T2A25 (2JZ±GTE)
C12B28E 2B26 (2JZ±GE)T 2B27 (2JZ±GE)
C1428E 9B29T 229
C1528E10A29V1025 (2JZ±GTE)
C1628P225 (2JZ±GTE)V1027 (2JZ±GE)
D 124 (2JZ±GTE)P 227 (2JZ±GE)
: 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)
1J
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)
IB636ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT 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
IE36LEFT KICK PANELIF36LEFT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E1432I 438COWL WIRE
E1632ENGINE WIREI 838INSTRUMENT PANEL WIREE2834
ENGINE WIRE
I1438INSTRUMENT PANEL WIRE
I 238COWL WIREI1738ENGINE WIRE