1996 TOYOTA RAV4 Sensor on engine head

28
G ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment
*1 : w/ A/C
*2 : w/o A/C
A 1 A/C Condenser Fan Motor E 1 Electronically Controlled Transmission Solenoid
A 2 A/C Magnetic Clutch and Lock Sensor E 2 Engine Coolant Temp. Sensor
A 3 A/C Triple Pressure SW (A/C Dual and Single
Pressure SW) F 1 Front Side Marker Light LH
A 4 A/C Water Temp. SW F 2 Front Side Marker Light RH
A 5 A/T Fluid Temp. SW F 3 Front Turn Signal Light LH and Front Parking
A 6 ABS Actuator Light LH
A 7 ABS Actuator F 4 Front Turn Signal Light RH and Front Parking
A 8 ABS Relay Light RH
A 9 ABS Relay F 5 Front Washer Motor
A 10 ABS Speed Sensor Front LH F 6 Front Wiper Motor
A 11 ABS Speed Sensor Front RH F 7 Fusible Link Block
B 1 Back-Up Light SW (M/T) G 1 Generator
B 2 Brake Fluid Level Warning SW G 2Generator
C 1 Center Diff. Lock Warning Buzzer SW H 1 Headlight LH
C 2 Crankshaft Position Sensor H 2 Headlight RH
C 3 Cruise Control Actuator H 3 Horn
D 1 Data Link Connector 1

64
ENGINE CONTROL
THE ENGINE CONTROL SYSTEM UTILIZES A MICROCOMPUTER AND MAINTAINS OVERALL CONTROL OF THE ENGINE ETC. AN
OUTLINE OF ENGINE CONTROL IS GIVEN HERE.
1. INPUT SIGNALS
(1) ENGINE COOLANT TEMP. SENSOR SIGNAL SYSTEM
THE ENGINE COOLANT TEMP. SENSOR DETECTS THE ENGINE COOLANT TEMP. AND HAS A BUILT-IN THERMISTOR WITH A
RESISTANCE WHICH VARIES ACCORDING TO THE ENGINE COOLANT TEMP. THUS THE ENGINE COOLANT TEMP. IS INPUT IN
THE FORM OF A CONTROL SIGNAL TO TERMINAL THW OF THE ENGINE CONTROL MODULE.
(2) INTAKE AIR TEMP. SIGNAL SYSTEM
THE INTAKE AIR TEMP. SENSOR DETECTS THE INTAKE AIR TEMP. , WHICH IS INPUT AS A CONTROL SIGNAL TO TERMINAL THA
OF THE ENGINE CONTROL MODULE.
(3) OXYGEN SENSOR SIGNAL SYSTEM
THE OXYGEN SENSOR DETECTS THE OXYGEN DENSITY IN THE EXHAUST EMISSION WHICH IS INPUT AS A CONTROL SIGNAL
TO TERMINALS OX1 AND OX2 OF THE ENGINE CONTROL MODULE.
(4) THROTTLE SIGNAL SYSTEM
THE THROTTLE POSITION SENSOR DETECTS THE THROTTLE VALVE OPENING ANGLE, WHICH IS INPUT AS A CONTROL
SIGNAL TO TERMINAL VTA OF THE ENGINE CONTROL MODULE, OR WHEN THE VALVE IS FULLY CLOSED.
(5) VEHICLE SPEED CIRCUIT
THE VEHICLE SPEED IS DETECTED BY VEHICLE SPEED SENSOR INSTALLED IN THE TRANSMISSION AND THE SIGNAL IS INPUT
TO TERMINAL SPD OF THE ENGINE CONTROL MODULE VIA THE COMBINATION METER.
(6) PARK/NEUTRAL POSITION SW SIGNAL SYSTEM
THE PARK/NEUTRAL POSITION SW DETECTS WHETHER THE SHIFT POSITION IS IN NEUTRAL OR NOT, AND INPUTS A CONTROL
SIGNAL TO TERMINAL NSW OF THE ENGINE CONTROL MODULE.
(7) A/C SW SIGNAL SYSTEM
THE OPERATING VOLTAGE OF THE A/C MAGNETIC CLUTCH IS DETECTED AND INPUT IN THE FORM OF A CONTROL SIGNAL TO
TERMINAL ACI OF THE ENGINE CONTROL MODULE.
(8) BATTERY SIGNAL SYSTEM
VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE. WHEN THE IGNITION SW IS
TURNED TO ON, VOLTAGE FOR THE ENGINE CONTROL MODULE OPERATION IS APPLIED VIA THE EFI MAIN RELAY TO
TERMINAL +B OF THE ENGINE CONTROL MODULE.
(9) INTAKE AIR VOLUME SIGNAL SYSTEM
INTAKE AIR VOLUME IS DETECTED BY THE MANIFOLD ABSOLUTE PRESSURE SENSOR AND IS INPUT AS A CONTROL SIGNAL
TO TERMINAL PIN OF THE ENGINE CONTROL MODULE.
(10) STARTER SIGNAL SYSTEM
TO CONFIRM THAT THE ENGINE IS CRANKING, THE VOLTAGE APPLIED TO THE STARTER MOTOR DURING CRANKING IS
DETECTED AND IS INPUT AS A CONTROL SIGNAL TO TERMINAL STA OF THE ENGINE CONTROL MODULE.
(11) ELECTRICAL LOAD SIGNAL SYSTEM
THE SIGNAL WHEN SYSTEMS SUCH AS THE REAR WINDOW DEFOGGER, HEADLIGHT, ETC. WHICH CAUSE A HIGH ELECTRICAL
BURDEN ARE ON IS INPUT TO TERMINAL ELS AS A CONTROL SIGNAL.
SYSTEM OUTLINE

K OVERALL ELECTRICAL WIRING DIAGRAM
1
234
18 RAV4
Power
SourceCombination Meter2ACC
IG 1 AM1 4
2
1
2 1D 91E 8
21B 8
1K 47
1D1
1F
8A
11A 10A 2A 6C 6B 13A 12A 5B 9A 8B 7B
2IG19IG2
10 IG25 ID1 9 ID1 7 IG2
6 IG2 5 IG2B 4
100A ALT
3
F 8
10A
GAUGE
[FUSE BLOCK]
F 7
FUSIBLE LINK BLOCKW 1
WATER TEMP.
SEND ER
From Engine Control
Module< 2-2 < 4-4
From C ruise C ontrol
ECU< 13-4From Engine Contro
Module< 2-3 See ABS System
<17-3See SRS System< 11-2
SPEED
TACHOFU EL FU EL WATER TEMP. MALFUNCTION
INDICATO R LAM POIL ABS
4 B
R- L
WWWR-LL- B R- Y V-WR-L Y-RBR
BR Y- G G-RY-R
R- L R-L R- L
I1 0
IG NIT IO N S W
, C1 1 C
2
111
IF EC ID110
Intake
manifold Instrument panel
brace RH V 2
VEHICLE SPEED SENSOR
(
C o mbina tion M et er)COM B INA T IO N M ET E R C 9 A , J 1 1 B
F11
FUEL SENDER(
Main) F12
FUEL SENDER(
Sub) B 2
BRAKE FLUID
LEVEL WARNING SW
3
2 1
3
R-L L- B R- YR- L Y-R Y-B
BRBR BR Y-GY-R
BATTER Y
BR9C 2C 3C7A 9B 1B 4A 3A 13B
7C 8C 5A 10B 11B B C2B
17 IG2 1B 19
S ee Charging
System< 1-4
BR AKE BU ZZER
S ee E lectronically C ontrolled
Transmission S ystem< 4- 4S e e C ente r D iff. L o ck
(
M/T)
System< 11-4
S ee Headlight
System< 3-4
See Turn Signal and
Hazard Warning
Light System< 7-2 See SRS System< 11-2
S ee Interior Light
System< 6-2
S ee C harging S ys tem< 1- 4 S ee Ele ctr on ic ally C o ntr olled
T ransmission System< 4-4S ee Inte rior Lig ht
System<6-2
R- B W-B
R
(
4W D A /T)
1I 1J
O 1
OIL PRESSURE SW
1
EAIG R adiator rightRight kick panel
P 2
PARKING BRAKE SW1
A 5
A/T FLU ID TEM P. SW
1 2
R-BW-B RW-B
(
4WD A/T)
R-B
2124
1 40A
AM 1
6
B
F ro m Ig nite r< 5- 4
B-Y
10 13 9 8 7 6 5 4 3 2 1101112 139 8 7 6 5 4 3 2 1101112
10 9 8 7 6 5 4 3 2 1B C10 BLUE A C 9 BROWN
C C11 GRAYCO M BINATION M ETER
W-B
CA
BB BBJ10 A
JUNCTION
CONNECTOR
3B
BU LB C HEC K From C lutch
Start SW< 1-2B-W
A AA
A
J 1
JU NC TIO N
CONNECTOR J10
JUNCTION
CONNECTOR
From ABS ECU< 17-4 R-B
C 5S ee U nlock and S eat
B elt W arning S ystem
<3-2
C
ASee Taillight and
Illu min ation Sy ste m
<8-3S ee Ta illig h t a n d
Illumination System< 8- 3
10
1 A
S ee C ruise Control S ystem
<13-36 , C10 B
TUR N LH TUR N RH
HIGH BEAM
ECT PW R C. D IFF
LO C KSRS
ILLUMINATION
OPEN DOOR
CHARGE O/D
OFF A/T OIL
TEM P. BELT CRUISE
AAAAAA
BBBCCCA J10 G R A Y
J11 B G R A Y JUNCTION
CONNECTOR
(M /T )
(
A/T) B
From P a rk/N eu tra l
Position SW <1-315

SF0Q4−03
− SFISFI SYSTEM
SF−1
1996 RAV4 (RM447U)
SFI SYSTEM
PRECAUTION
1. BEFORE WORKING ON THE FUEL SYSTEM, DISCON-
NECT THE NEGATIVE (−) TERMINAL CABLE FROM
THE BATTERY
HINT:
Any diagnostic trouble code retained by the computer will be
erased when the negative (−) terminal cable is removed.
Therefore, if necessary, read the diagnosis before removing the
terminal.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME
WHEN WORKING ON THE FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATH-
ER PARTS
4. MAINTENANCE PRECAUTIONS
(a) In event of engine misfire, these precautions should be
taken.
(1) Check proper connection to battery terminals, etc.
(2) After repair work, check that the ignition coil termi-
nals and all other ignition system lines are recon-
nected securely.
(3) When cleaning the engine compartment, be espe-
cially careful to protect the electrical system from
water.
(b) Precautions when handling oxygen sensor.
(1) Do not allow oxygen sensor to drop or hit against an
object.
(2) Do not allow the sensor to come into contact with
water.
5. IF VEHICLE IS EQUIPPED WITH MOBILE RADIO SYS-
TEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication system,
refer to the precaution in the IN section.
6. AIR INDUCTION SYSTEM
(a) Separation of the engine oil dipstick, oil filler cap, PCV
hose, etc. may cause the engine to run out of tune.
(b) Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will allow air suction and cause the engine to run out
of tune.
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing SFI wiring connectors, terminals, etc.,
first disconnect the power by either turning the ignition
switch to LOCK or disconnecting the negative (−) terminal
cable from the battery.
HINT:
Always check the diagnostic trouble code before disconnecting
the negative (−) terminal cable from the battery.