1986 TOYOTA SUPRA check engine light

77
* 1 : ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU
I14 10A
GAUGE
I14
I5
II1 2II123 II18
IJ1 13 IJ1 5 IJ1 171E 12
II1 15 II111 IF173 2
1 3
IF ENG TE 1 TE2 E1W TT
2 15
67
7 1 2 38 5L±BL±RY
Y±L
LG
P BR GR±R
L±BBR
PL±B
P
BR
L±R
Y
RYY Y
Y
L±B LG P±G
Y±L
V10
VEHICLE SPEED SENSOR
(
SPEED SENSOR)
NO. 1
(
FOR COMBI NA TI ON M ETER) ODO AND
TRIP
TELLTALE LIGHT RHMALFUNCTION INDICATOR LAMP
(
CHECK ENGINE WARNING LIGHT)
[TELLTALE LIGHT LH] T5
T6
FROM POWER SOURCESYSTEM(
SEE PAGE 56)
L±B
DATA LINK
CONNECTOR 2
(
TDCL) D5I14I14
A 11 A10 B11 A 9
L±R
Y Y
R
BR
Y
L±R
SPEEDOMETER
[COMB. METER]B C10 , C12A
P±G
L±B
BR
(
A/T)
I8

83
(13) ENGINE KNOCK SIGNAL CIRCUIT
ENGINE KNOCKING IS DETECTED BY KNOCK SENSOR FRONT AND REAR SIDE AND THE SIGNAL IS INPUT INTO TERMINALS
KNK1 AND KNK2 AS A CONTROL SIGNAL.
2. CONTROL SYSTEM
*SEQUENTIAL MULTIPORT FUEL INJECTION (ELECTRONIC FUEL INJECTION) SYSTEM
THE SEQUENTIAL MULTIPORT FUEL INJECTION (ELECTRONIC FUEL INJECTION) SYSTEM MONITORS THE ENGINE CONDITION
THROUGH THE SIGNALS INPUT FROM EACH SENSOR (INPUT SIGNALS FROM (1) TO (13) ETC.) TO THE ENGINE CONTROL
MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU). THE BEST FUEL INJECTION TIMING IS DECIDED
BASED ON THIS DATA AND THE PROGRAM MEMORIZED BY THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU), AND THE CONTROL SIGNAL IS OUTPUT TO TERMINALS #10, #20, #30, 40, #50 AND #60 OF
THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) TO OPERATE THE
INJECTOR (INJECT THE FUEL). THE SEQUENTIAL MULTIPORT FUEL INJECTION (ELECTRONIC FUEL INJECTION) SYSTEM
PRODUCES CONTROLS OF FUEL INJECTION OPERATION BY THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU) IN RESPONSE TO THE DRIVING CONDITIONS.
*ESA (ELECTRONIC SPARK ADVANCE) SYSTEM
THE ESA SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS INPUT TO THE ENGINE CONTROL MODULE
(ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) FROM EACH SENSOR (INPUT SIGNALS FROM (1), (2), (4) TO
(13) ETC.). THE BEST IGNITION TIMING IS DECIDED ACCORDING TO THIS DATA AND THE MEMORIZED DATA IN THE ENGINE
CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) AND THE CONTROL SIGNAL IS OUTPUT
TO TERMINAL IGT. THIS SIGNAL CONTROLS THE IGNITER TO PROVIDE THE BEST IGNITION TIMING FOR THE DRIVING
CONDITIONS.
*HEATED OXYGEN SENSOR HEATER CONTROL SYSTEM (FOR CALIFORNIA)
THE MAIN HEATED OXYGEN SENSOR FRONT AND REAR SIDE, SUB HEATED OXYGEN SENSOR HEATER CONTROL SYSTEM
TURNS THE HEATER ON WHEN THE INTAKE AIR VOLUME IS LOW (TEMP. OF EXHAUST EMISSIONS IS LOW), AND WARMS UP THE
OXYGEN SENSOR TO IMPROVE DETECTION PERFORMANCE OF THE SENSOR. THE ENGINE CONTROL MODULE (ENGINE AND
ELECTRONICALLY CONTROLLED TRANSMISSION ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM
(1), (2), (4), (9) TO (11) ETC.), AND OUTPUTS CURRENT TO TERMINALS HT1, HT2, HT3 TO CONTROL THE HEATER.
*IDLE AIR CONTROL (IDLE SPEED CONTROL) SYSTEM
THE IDLE AIR CONTROL (ISC) SYSTEM (STEP MOTOR TYPE) INCREASES THE ENGINE SPEED AND PROVIDES IDLING STABILITY
FOR FAST IDLE±UP WHEN THE ENGINE IS COLD, AND WHEN THE IDLE SPEED HAS DROPPED DUE TO ELECTRICAL LOAD AND SO
ON. THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) EVALUATES THE
SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM (1), (4), (5), (8), (9), (11) ETC.), OUTPUTS CURRENT TO TERMINALS ISC1,
ISC2, ISC3 AND ISC4 TO CONTROL THE IDLE AIR CONTROL VALVE (ISC VALVE).
*EGR CONTROL SYSTEM
THE EGR CONTROL SYSTEM DETECTS THE SIGNAL FROM EACH SENSOR (INPUT SIGNALS FROM (1), (4), (9), (10) ETC.), AND
OUTPUTS CURRENT TO TERMINAL EGR TO CONTROL THE EGR VALVE.
*FUEL PUMP CONTROL SYSTEM
THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) OUTPUTS CURRENT TO
TERMINAL FPC AND CONTROLS THE FUEL PUMP ECU AND FUEL PUMP DRIVE SPEED IN RESPONSE TO THE DRIVING
CONDITIONS.
*ACIS (ACOUSTIC CONTROL INDUCTION SYSTEM)
ACIS INCLUDES A VALVE IN THE BULKHEAD SEPARATING THE SURGE TANK INTO TWO PARTS. THIS VALVE IS OPENED AND
CLOSED IN ACCORDANCE WITH THE DRIVING CONDITIONS TO CONTROL THE INTAKE MANIFOLD LENGTH IN TWO STAGES FOR
INCREASED ENGINE OUTPUT IN ALL RANGES FROM LOW TO HIGH SPEEDS.
THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) JUDGES THE VEHICLE
SPEED BY THE SIGNALS ((4), (5)) FROM EACH SENSOR AND OUTPUTS SIGNALS TO THE TERMINAL ACIS TO CONTROL THE VSV
(FOR INTAKE CONTROL VALVE).
3. DIAGNOSIS SYSTEM
WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ENGINE CONTROL MODULE (ENGINE AND
ELECTRONICALLY CONTROLLED TRANSMISSION ECU) SIGNAL SYSTEM, THE MALFUNCTIONING SYSTEM IS RECORDED IN THE
MEMORY. THE MALFUNCTIONING SYSTEM CAN BE FOUND BY READING THE CODE DISPLAYED BY THE MALFUNCTION INDICATOR
LAMP (CHECK ENGINE WARNING LIGHT).
4. FAIL±SAFE SYSTEM
WHEN A MALFUNCTION HAS OCCURRED IN ANY SYSTEM, IF THERE IS A POSSIBILITY OF ENGINE TROUBLE BEING CAUSED BY
CONTINUED CONTROL BASED ON THE SIGNALS FROM THAT SYSTEM, THE FAIL±SAFE SYSTEM EITHER CONTROLS THE SYSTEM
BY USING DATA (STANDARD VALUES) RECORDED IN THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU) MEMORY OR ELSE STOPS THE ENGINE.

89
* 2 : EXCEPT CALIFORNIA *
1 : CALIFORNIA
*
3 : ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU
10A
GAUGE
I5 I14 I14 I14
I14
I11II1 15 II111II1 23 1E 12
IJ1 6
II1 2II18 IF173 2
65
32
12738 511
TE1 TE2 ENG E1
Y±L
P±G
LG
L±B
P
BR
BR GR±R
L±BYY
L±R
L±R L±B
BR
Y±L
P±G
LG
BRGR±R
L±B L±B L±B
PP
L±RYY
Y
Y
Y Y
R L±R L±R
RL±RR
TT W
DATA LINK CONNECTOR 2
(
TDCL)
TELL TALE
LIGHT RHMALFUNCTION INDICATOR LAMP
(
CHECK ENGINE WARNING LIGHT)
[TELLTALE LIGHT LH] D5
T6T5
FROM POWER SOURCESYSTEM(
SEE PAGE 56)
SPEEDOMETER
[COMB. METER]
VEHICLE SPEED SENSOR
(
SPEED SENSOR)
NO. 1
(
FOR COMBINATION METER) V10
ODO AN D
TRI P
B C10 , C12
AA 9
A 10 A11
B 11
IF
BR BR
(
A/T)
(
A/T)
(
*1)7
BRBR
I8

142
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR (FOR 2JZ±GTE)
15A
STOP
1 2 1 2
2 1
1 2
1 2
1 2 2 1
E1 6 I17
E16 E1 6 E161I 10
1J 11H 13
IE IJ1 11
IJ1 6
IJ2 12 IJ2 3 B 21 B1A4A20 A19 B 29 A17
B 42 B63 B44 B24 B46 A3A18 B27 B7 IJ15
IJ113
3 128 13 12759
43124 VTA2 IDL2 THW OIL THG KD M NE NE±ECT TT ENG TE2 TE 1 VF1 TE1 +B
BR±B BR±B BR±BL±R B±R
LG Y±L
V±G
L±Y
O
BR±Y GR±RY±L
BR±B BR±B BR±B GR±RBR±BY±L L±R
W±B W±B
W±B
G±Y
B±R
BRG±YYLG
P±GY±LG±WYL
G±W W
B±R
Y±L
LG
Y±L
P±G
LG
GR±R
V±G GR±R (
SHIELDED)(
SHIELDED) NCO+ NCO± STP TE1 TE2VF1 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
STOP LIGHT
SWDATA LINK CONNECTOR 1
(
CHECK CONNE CTOR)
O/D DIRECT CLUTCH
SPEED SENSOR
S11D1
O1
TT DATA LINK CONNE CTOR 2
(
TDCL) D5
Y
S5
SUB THROTTLE
POSITION SENSOR
ENGINE COOLANT TEMP. SENSOR
(
EFI WATER TEMP. SENSOR)
A/T FLUID TEMP. SENSOR
EGR GAS TEMP. SENSOR
KICK DOWN SW E3
A5
E1
K4
ELECTRONICALLY CONTROLLED
TRANSMISSION PATTERN
SELECT SW
CRANKSHAFT
POSITION SENSOR
E8
C3
ENGINE CONTROL MODULE(
*1) A E9 ,E10B
NORMAL
MANUAL
IJ1 17

152
ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR (FOR 2JZ±GE)
15A
STOP
1 2 1 2
2 1
1 2
1 2I17 I17
E28 E281I 10
1J 11H 13
IE IJ1 11
IJ1 6
IJ2 12 IJ2 3 A 4A20 B29 A17
B 44 B24 B46 A3A18 B25 B7 IJ15
IJ113
3 12 8 13 1 7 5 9
4 THW OIL THG KD M G2 G±ECT TT ENG TE 1 VF1 TE1 +B
BR±B BR±BB±R
LG Y±L
V±G
L±Y
O
BR±Y BR±B BR±B BR±B
W±B W±B
W±B
G±Y
W
GG±YY
LG Y±L G±W G±W W
B±R
Y±L
LG
Y±L
LG
GR±R
V±G GR±R (
SHIELDED)(
SHIELDED) STP TE1 VF1 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
STOP LIGHT
SWDATA LINK CONNECTOR 1
(
CHECK CONNE CTOR)
S11D1
TT DATA LINK CONNE CTOR 2
(
TDCL) D5
Y ENGINE COOLANT TEMP. SENSOR
(
EFI WATER TEMP. SENSOR)
A/T FLUID TEMP. SENSOR
EGR GAS TEMP. SENSOR
KICK DOWN SW E3
A5
E1
K4
ELECTRONICALLY CONTROLLED
TRANSMISSION PATTERN
SELECT SW E8 E NGINE CONTROL MODULE(
*1) A E9 ,E10B
B 26G1
R
B 27NE
B
1234
NE G1 G2 G±
DISTRIB UTOR D4
BRBR
NORMAL
MANUAL
A 192TE2
P±G P±G
TE 2 IJ1 17

220
COMBINATION METER
15A
HEAD(
RH)
(
FOR USA)7. 5A
ST
21K4
1E 19 1E14 1H 11 1H7 P
N5
6
2 1
IF2 13 IF1 6IB1 2
IF2 1IF24IF114
IE1 1IE12IE13
BP1 5BP13BP11 II1 24 II1 19 A 2A 16 A15 B6
A 7A6A3A9A8B8A10 A11 A13
II1 29
TRAC
CRUISE
HIGH BEAM
WATER TEMP.
FUEL
FUEL
TACHO
IJ213
IE EC IFI3 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
IJ29
EXT
F14I4
E10
C9
P2
COMBINATION METER FROM HEADLIGHT HI RH
FUEL SENDERIGNITER
ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU)
CLUTCH START
SW
PARK/NEUTRAL POSITION
SW(
NEUTRAL START SW) Y±G
Y±B
BR BRY±B Y±GBR Y±L R±LO W
Y±G
Y±B
BR
B±W B±W
B±W BRBR Y±LR±L W±BW
O TO TRACTION ECU
TO CRUISE CONTROL
ECU
TO DIMMER SW
[COMB. SW]
ENGINE COOLANT TEMP. SENDER
(
WATER TEMP. SENDER)
LH
RH TURN
B
(
A/T)
B
(
M/T)B±W
(
M/T) R±W
(
*1)B±W
G±B
G±Y R±W R±W
R±W
G±B
G±YB±W(
A/T)B
B BR
BR
(
*4)
(
*3) (
*1)(
*2)
BULB
CHECK RELAY
123416FROM TURN SIGNAL SW
[COMB. SW]
2 1
(
*2)
E4
C C10 , C11 , C 1 2BA
(
*3)
1TACO

240
GROUND POINT
FRONT FOG LIGHT AND
PA RKING LIGHT RH
EFI NO. 2 RELAY
EFI MAIN RELAY
HEATER RELAY
FRONT WIPER MOTOR
A/C CONDENSER FAN
MOTOR
BRAKE FLUID LEVEL
WARNING SW
TRACTION PUMP AND
MOTOR
COMBINATION METER
ENGINE OIL
LEVEL SENSOR
NOISE FILTER
IGNITER FRONT FOG LIGHT AND
PARKING LIGHT LH FRONT SIDE MARKER
LIGHT LHDA YTIME
RUNNING
LIGHT RELAY
NO. 3
FRONT SIDE MARKER
LIGHT RH
ENGINE HOOD
COURTESY SW
FRONT TURN SIGNAL
LIGHT LH
FRONT TURN SIGNAL
LIGHT RH
HEADLIGHT LO RH
HEADLIGHT LO LH
ABS RELAY
A /C DUA L PRE SSURE
SW
ABS SOLENOID
RELAY
TRACTION SOLENOID
RELAY
A BS ACTUATOR E2
E5
E8 E8 E2 E2E2 0 2
2
2
5
5
EB EA
HEATED OXYGEN
SENSOR(
SUB)
HEATED OXYGEN
SENSOR(
MAIN)
ED EC II1 24
I17 E16 I 17I11
IJ1 18
(
E1)
(
E01)
(
E02) IC18 W±B
W±B
W±B
W±B W±B
W±B W±BW±B
W±B
W±B
W±B
W±B
W±B
BR
BR
BR
BRBR
BR W±BW±B
(
*4)
W±B
(
*3) W±B
(
*3)W±B
(
*1)
W±B
(
*4)
W±B
W±B
W±B
W±B
W±B
W±B W±BW±B W±B
BR BR
BR
BR
BR
BR
BR BR
BR BRBR
BR
W±B
(
*3)W±B
W±B
(
*3) E7 :*3
E20 : * 4E2:*3
E18 : * 4E2:*3
E18 : * 4
E2:*3
E18 :
*4
E5:*3
E19 : * 4
DAYTIME RUNNING
LIGHT RELAY
NO. 3 RADIATOR FAN MOTOR
E11 : * 3
E24 :
*4W±B
W±B
W±B W±B
W±B
(
*1)E2:*3
E18 : * 4
W±B
(
*3)
(
±S)(
±S)
DATA LINK CONNECTOR 2
(
TDCL)
DATA LINK CONNECTOR 1
(
CHECK CONNECTOR) RADIATOR FAN
RELAY NO. 2 (
E) ENGINE COOLANT TEMP.
SW(
WATER TEMP. SW)
(
±S)
E3
W±B W±B
W± B W± B W±B W±B
W±B
W± B
BR E2:*3
E18 : * 4
(
L)
E8 W±B
(
*1)
(
*3) (
*3)(
*3)
(
*3)
(
*3)(
*3)
(
*3)
(
*3)
(
*3)
ENGINE CONTROL
MODULE
(
ENGI NE AND
ELECTRONICALLY
CONTROLLED
TRANSMI SSION)
W±B

241
*
4:2JZ±GE *
2:USA *
1 : CANA DA*
3:2JZ±GTE
SUB HEATED OXYGEN
SENSOR
(
FOR CALIFORNIA)
VOLUME AIR FLOW
(
AIR FLOW METER)
POWER STEERING
PRESSURE SW
DOOR LOCK MOTOR AND
DOOR UNLOCK
DETECTION SW LH
ROOM LIGHT SW
[DOOR KEY LOCK AND
UNLOCK SW LH]
DOOR KEY LOCK AND
UNLOCK SW LH
REMOTE CONTROL
MIRROR AND MIRROR
HEATER LH
POWER WINDOW MASTER
SW
PERSONAL LIGHT
CENTER AIRBAG
SENSOR ASSEMBLY
POWER MAIN RELAY
INTEGRA TION RELAY
LIGHT CONTROL SW
[COMB. SW]
DIMMER SW
[COMB. SW]
DAYTIME RUNNING
LIGHT RELAY NO. 3HEATED OXYGEN
SENSOR
(
FOR CALIFORNIA
ON FRONT SIDE)
HEATED OXYGEN
SENSOR
(
FOR CALIFORNIA
ON REAR SIDE)
(
E1)
CRUISE CONTROL
ECU
KICK DOWN SW
CRUISE CONTROLH SW
[COMB. SW]
UNLOCK W ARNING SW
KEY INTERLOCK
SOLENOID
WIPER AND WASHER SW
[COMB. SW]
RHEOSTAT
REMOTE CONTROL
MIRROR SW
TELLTALE LIGHT LH
TURN SIGNAL
FLASHER I11 I17 E27
E28
I17
I4
I9
I2
I2
I3
I3
I1 B1 B1 B1 B1IJ118
IC18
ED
1H13
1K12
1E18
1J1
1K6 1D10
1F6
1G3
IG4
1K5E28
E27
4
IE(
E01)
(
E02)
W±B
W±B
IB513
W±B
(
*
1) W±B
(
*
1)(
*
4) BR BR BR BR BR BR
BR
BR
BR
BR BR
BR
BR
BR
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B W±BW±B W±B W±B W±B
W±B W±B W±B W±B
W±B W±B
W±B
W±B
W±BBR BR
BR BR BR W±B W±B W±B
(
E1)
(
E2)
W±B W±B
W±B
W±B W±B DATA LINK CONNECTOR 2
(
TDCL)
DATA LINK CONNECTOR 1
(
CHECK CONNECTOR)
ENGINE CONTROL
MODULE
(
ENGINE AND
ELECTRONICALLY
CONTROLLED
TRANSMISSION)
(
A/T)