ect LEXUS SC300 1991 Service Repair Manual

41
CODEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
BS1ENGINE ROOM MAIN WIRE AND FLOOR WIRE (LEFT KICK PANEL)
BT1FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)
BU1INSTRUMENT PANEL WIRE AND FLOOR WIRE (LEFT KICK PANEL)
BV1
BV2FLOOR NO. 3 WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)
BV3
FLOOR NO. 3 WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)
BW1ENGINE ROOM MAIN WIRE AND FLOOR NO. 3 WIRE (RIGHT KICK PANEL)
BX1FLOOR NO. 3 WIRE AND COWL WIRE (RIGHT KICK PANEL)
BY1INSTRUMENT PANEL WIRE AND FLOOR NO. 3 WIRE (RIGHT KICK PANEL)
BZ1ROOF WIRE AND MOON ROOF WIRE (FRONT SIDE OF ROOF LEFT)
Bc1FLOOR NO 3 WIRE AND FLOOR WIRE (UNDER THE LEFT SIDE OF REAR SEAT CUSHION)Bc2FLOOR NO. 3 WIRE AND FLOOR WIRE (UNDER THE LEFT SIDE OF REAR SEAT CUSHION)
Bd1FLOOR NO. 3 WIRE AND LUGGAGE NO. 2 WIRE (RIGHT SIDE OF LUGGAGE COMPARTMENT)
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ELECTRICAL WIRING ROUTING
: Location of Connector Joining Wire Harness and Wire Harness
: Location of Splice Points
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43
CODEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
Ba1FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)Ba2FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)
Bb1FLOOR NO. 3 WIRE AND FRONT SEAT RH WIRE (UNDER THE FRONT RH SEAT)
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CORNERING LIGHT RELAY 3±5 : CLOSED WITH LIGHT CONTROL SW AT HEAD POSITION
C15 LIGHT CONTROL SW [COMB. SW]
13±4 : CLOSED WITH LIGHT CONTROL SW AT HEAD POSITION
C16 CORNERING LIGHT SW [COMB. SW]
8±11 : CLOSED WITH TURN SIGNAL LEVER AT LEFT POSITION
8±10 : CLOSED WITH TURN SIGNAL LEVER AT RIGHT POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C 626C1528I16A29 (USA)
C 726C1628I16B29 (CANADA)
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
423LEFT KICK PANEL (J/B NO.1 LEFT)
523LEFT KICK PANEL (J/B NO.1 RIGHT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1I
1J20COWL WIRE
1K
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IE136ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA34FRONT SIDE OF RIGHT FENDER
IF36LEFT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E 434ENGINE ROOM MAIN WIRE
12 56
X1213 A
B
C 6, C 7 C15 C16 I16
I1 6
(
CA NA DA ) (
US A )
BLACK
GRAY
X
XXX13 4
X
X X
8X 10 11
SERVICE HINTS
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148
CRUISE CONTROL
1E
12 1K 13 2 1
3F
4
1B
5
3E
1
B BATT
A
1 A
14SPD GND CMS CCS PI TC
A
10 B 20
11
4
10
IG1
7
IK1
10
10A
DOME
15A
ECU±IG
10A
GAUGE
1H
10
CRUISE CONTROL
INDICATOR LIGHT
[COMB. METER]
TDCL CHECKCONNECTOR
CRUISE CONTROL ECU
CRUISE CONTROL SW
[COMB. SW]
E CMS
CCS
MAIN
CANCEL
RESUME/
ACCEL
SET/
COAST
CRUISE CONTROL
A/D TC TC
Y±BY±BL
15
5
R
R B±R
Y
Y
PP W±B
BR
W±B Y±B P±B
P±B P±B R±L
L
Y±B
P±B
Y±B
C19
C15
T6 C3
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
IG1
13
IG1
15
3A
8
3H
12
3E
3
IH IG 20 13 4 18 5 8
6
14 15
3A
4
3D
13
W±B
W±BP±B
C12 ,C1 4
A
B
3C4
2
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1K
4 1I
10
B
9B 64 A 12
1
IJ2
2IJ2 1IJ1
6
PARKING
BRAKE SWM42
4 31
5
7
6
23
1 25A
STOP
7. 5A
ST
POTENTIO METER
CRUIS E CONTROL ACTUATOR GN DL
MC
MO
VR3
VR2
VR1
MAGNETIC
CLUTCH
S2 IDL1 OD1
ECT IDL OD VR1 VR2 VR3 MC MO L STP±
N& C STP+
CRUISE CONTROL ECU
STOP
LIGHT
SW
B±W B±W
W
B±W
W
W
G±W BR±Y
R
W±R
W±R
R
BR±Y
R±B
LG±R P
LG
G±R
W
R±L R±B
LG±R P
LG
G±R B±W
W±B
I9
S12
C19
P3C8
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
R±W
B
PKB
ENGINE AND ECT ECU E9 ,E10
I7
EA
IE 2
10
IE2
11
IE2
5
IE2
1
IE2
6
IE2
2
IG1
19
IJ2
9
B (
CANA DA )
(
USA )
R±L
22 23 9 3 24 25 26 12 11 10 16 1
A B IJ2
10
I9
C24 C23
CLUTCH
START SW CRUISE
CONTROL
CLUTCH SW(
A/T )
B±W
BB±W
B±W
B±W
(
A/T )
(
A/T )
1
2
2
21
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7. AUTO CANCEL FUNCTION
A) IF ANY OF THE FOLLOWING OPERATING CONDITIONS OCCURS DURING CRUISE CONTROL OPERATION, THE SET SPEED IS
ERASED, CURRENT FLOW TO MAGNETIC CLUTCH IS STOPPED AND THE CRUISE CONTROL IS RELEASED. (MAIN SWITCH TURNS
OFF).
WHEN THIS OCCURS, THE IGNITION SWITCH MUST BE TURNED OFF ONCE BEFORE THE MAI\
N SWITCH WILL TURN ON.* OVER CURRENT TO TRANSISTER 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 SWITCH.
* MOTOR DOES NOT OPERATE DESPITE THE MOTOR DRIVE SIGNAL BEING OUTPUT.
B) IF ANY OF THE FOLLOWING CONDITIONS OCCURS DURING CRUISE CONTROL OPERATION, THE SET SPEED IS ERASED AND
THE CRUISE CONTROL IS RELEASED. (THE POWER OF MAGNETIC CLUTCH IS CUT OFF U\
NTIL THE SET SWITCH IS ªONº AGAIN.) * WHEN THE VEHICLE SPEED FALLS BELOW THE MINIMUM SPEED LIMIT, APPROX. 40 KM/H ( 2.5 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 OCCURS DURING CRUISE CONTROL OPERATION, THE CRUISE CONTROL IS
RELEASED.
* OPEN CIRCUIT FOR TERMINAL 1 OF CRUISE CONTROL ECU AND SPLICE POINT ªI 9º.
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 OVE\
RDRIVE RETURN SPEED (SET SPEED
MINUS APPROX. 2 M/H, 1.2 MPH) AND THE ECU JUDGES BY THE SIGNALS FROM POTENTIOMETER OF THE ACTUATOR THAT THE
UPWARD SLOPE HAS FINISHED, OVERDRIVE IS RESUMED AFTER APPROXIMATELY 6 SECONDS.
* DURING CRUISE CONTROL DRIVING, THE CRUISE CONTROL OPERATION SIGNAL IS OUTPUT FROM THE CRUISE CONTROL
ECU TO THE ENGINE AND TRANSMISSION ECU. UPON RECEIVING THIS SIGNAL, THE ENGIN\
E AND 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 FORBIDD\
EN.
C 8 CRUISE CONTROL ACTUATOR
1±3 : APPROX. 2K

5±4 : APPROX. 38.5

C15 CRUISE CONTROL SW [COMB. SW]
15±6 :CONTINUITY WITH MAIN SW ON
5±6 :APPROX. 420
WITH CANCEL SW ON
APPROX. 70
WITH RESUME/ACCEL SW ON
APPROX. 200
WITH SET/COAST SW ON
C19 CRUISE CONTROL ECU
14±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
1, 15±GROUND : ALWAYS APPROX. 12 VOLTS
3±GROUND : CONTINUITY WITH PARKING BRAKE LEVER PULLED UP (ONE OF THE CANCEL SW) OR BRAKE LEVER WARNING SW ON
20±GROUND : 1 PULSE WITH 40CM (DRIVER VEHICLE SLOWLY)
18±GROUND : APPROX. 420
WITH CANCEL SW ON IN CONTROL SW
APPROX. 200
WITH SET/COAST SW ON IN CONTROL SW
APPROX. 70
WITH RESUME/ACCEL SW ON IN CONTROL SW
13±GROUND : ALWAYS CONTINUITY
SERVICE HINTS
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CRUISE CONTROL
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C 326C1928P 329
C 826C2328S1229
C12B28C2428T 629
C14A28E 9A28
C1528E10B28
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
219ENGINE COMPARTMENT LEFT
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20ENGINE ROOM MAIN WIRE
1E20INSTRUMENT PANEL WIRE
1H
1I20COWL WIRE
1K
20COWL WIRE
3A
3C
3D22INSTRUMENT PANEL WIRE3E22INSTRUMENT PANEL WIRE
3F
3H
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IE236ENGINE ROOM MAIN WIRE AND COWL WIRE (BEHIND GLOVE BOX)
IG136INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)
IJ136ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)IJ236ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
IK136ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA34FRONT SIDE OF RIGHT FENDER
IG36INSTRUMENT PANEL BRACE LH
IH36UNDER THE ASHTRAY LH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I 738COWL WIREI 938COWL WIRE
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126
ECT AND A/T INDICATOR
21I
5
22 EB1 8 EB14
A
24 A 33 A 12 A1
A
32 A 31 B 10 B8
22
EB2
3
I33 IJ2
11
EB B±Y
B±O
B±R
B±Y
B±O B±Y
B±O
W±B
B±R
B±Y
BR±Y B±O B±O
B±R
B±R
LG
R±L
B±R
W±B
FROM POWER SOURCE SYSTEM (
SEE PAGE 56 )
30A
EFI
3
13
WY
M±REL BATT OD1 IGSW +B1 +B S1 S3
FROM
CRUISE CONTROL ECU (
OD )
7. 5A
IGN
21
43
ENGINE AND ECT ECU
ECT SOLENOID
E9
,E10
B
A
NO. 1
NO. 3
EFI
MAIN
RELAY 4
B
9
W±R
2
B
S2
NO. 2
E1
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2 1
2
1
E18 E20
E20 I32
I32
B
27 B
4B 28 A20 B 29
B
42 B 63 B 41 B43 B64 B65 B 44 B 23 B3
ED
E18
L±R
Y±L
R±B
BR
L±R Y
R BR
BR
Y±L
R±B
L±R Y
R
BR
G
P
V
GR±Y LG
B±Y BR
LG
BR
W±B
BR L
LG
GR±Y
BR
L±R
GR±Y
14 8 13
3
NE
E11 VF2 TE1 VF1
VTA2 IDL2 VC VTA1 IDL1 E2 THW SP2 SP2±
G1 TVF1
E1
SUBTHROTTLEPOSITION
SENSOR
(
W/ TRACTION CONTROL ) THROTTLE POSITION SENSOR
EFI WATER
TEMP. SENSOR
SPEED SENSOR
NO. 2(
FOR ECT )
ENGINE AND ECT ECU
CHE CK CONNE CTOR
VC VTA IDL2 E2 VC VTA IDL E2
4321 4321
C3
S4
E2
T2
S9
B
E9
,E10
A
P
(
W/ TRACTION CONTROL )
( W/ TRACTION CONTROL )
( W/ TRACTION CONTROL )
( W/ TRACTION
CONTROL )
BR
B
26
R
G1
B
25
Y
G2
B
7
B
G±
VF2
NE
G±
G2 B
79
W±B
EO2
B
80
W±B
EO1
I33 I33 B
69
BR
E1
W±B W±B
2341
D13
DISTRIBUTOR
BR
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