1996 TOYOTA RAV4 Engine

65
2. CONTROL SYSTEM
*SFI
THE SFI SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS, WHICH ARE INPUT FROM EACH SENSOR (INPUT
SIGNALS (1) TO (11)). THE BEST FUEL INJECTION VOLUME IS DECIDED BASED ON THIS DATA AND THE PROGRAM MEMORIZED
BY THE ENGINE CONTROL MODULE, AND THE CONTROL SIGNAL IS OUTPUT TO TERMINALS #10, #20, #30, AND #40 OF THE
ENGINE CONTROL MODULE TO OPERATE THE INJECTOR (INJECT THE FUEL). THE SFI SYSTEM PRODUCES CONTROL OF FUEL
INJECTION OPERATION BY THE ENGINE CONTROL MODULE IN RESPONSE TO THE DRIVING CONDITIONS.
*IDLE SPEED CONTROL SYSTEM
THE IDLE SPEED CONTROL SYSTEM INCREASES THE RPM AND PROVIDES IDLING STABILITY FOR FAST IDLE-UP WHEN THE
ENGINE IS COLD AND WHEN THE IDLE SPEED HAS DROPPED DUE TO ELECTRICAL LOAD, ETC. THE ENGINE CONTROL MODULE
EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS (1 TO 5, 11), OUTPUTS CURRENT TO TERMINAL ISCO AND ISCC,
AND CONTROLS THE IDLE AIR CONTROL VALVE.
*A/C CUT CONTROL SYSTEM
WHEN THE VEHICLE SUDDENLY ACCELERATES FROM LOW ENGINE SPEED, THIS SYSTEM CUTS OFF AIR CONDITIONING
OPERATION FOR A FIXED PERIOD OF TIME IN RESPONSE TO THE SPEED SENSOR, THROTTLE VALVE OPENING ANGLE AND
INTAKE MANIFOLD PRESSURE IN ORDER TO MAINTAIN ACCELERATION PERFORMANCE.
THE ENGINE CONTROL MODULE RECEIVES INPUT SIGNALS (4, 5 AND 9), AND INPUTS SIGNALS TO TERMINAL ACT.
3. DIAGNOSIS SYSTEM
WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ENGINE CONTROL MODULE SIGNAL SYSTEM, THE
MALFUNCTIONING SYSTEM IS RECORDED IN THE MEMORY. THE MALFUNCTIONING SYSTEM CAN THEN BE FOUND BY READING
THE DISPLAY (CODE) OF THE MALFUNCTION INDICATOR LAMP.
4. FAIL-SAFE SYSTEM
WHEN A MALFUNCTION OCCURS ON ANY SYSTEM, IF THERE IS A POSSIBILITY OF ENGINE THROUBLE BEING CAUSED BY
CONTINUED CONTROL BASED IN THE SIGNALS FROM THAT SYSTEM, THE FAIL-SAFE SYSTEM EITHER CONTROLS THE SYSTEM BY
USING DATA (STANDARD VALUES) RECORDED IN THE ENGINE CONTROL MODULE MEMORY OR ELSE STOPS THE ENGINE.

66
ENGINE CONTROL
6
8
20A
AM25A IG N
USE
LOCK]15A
EFI FROM PO WER SO URCE SYSTEM (
SEE PAGE 54)
2
25 1355
5525 1366
66
2 2
IG 1 8IG13
ID1 4 IG 1 11
IG 1 4
EA1 2
IB 1 11
1 1 1 1
BH EA17
2011
2110B-O
B-R
B-W(
A/T)
R-W
G-R
B-Y
B-R B-Y
B-YR-W
W
B-O
B-O B-Y B-RB-Y B-R
WW-BB-Y
L- B G-RB-R B-R
B-O
B-O
R-WB-Y
B-O
B-R B-R
B-R B-R
B-WB
B- OR-W
O
BATTERY
IN
IN
IN
IN I
I
I
I
EFI M A IN R ELA Y CIRCUIT OPENING
RELAY F
B-Y B-Y
EA1 7
B-R
16
8
F
B-R
I 1
I 1E 1 B (
M/T)
B-R B-Y
W
7AM2AM 1ACC
IG 1
IG 2
ST2
IG NITIO N SW I1 0
7.
[F
B F
1H 14 1E9 1D8
1D3
1H13
1I 171E 1
1J2
B-
A A
5 4
2 2 2 2
B-O B-O B-O B-O
-BL-B 5
JUNCTION
CONNECTOR
FUEL
PUM P F11J 1
I 5 I 5
-B
80A M AIN
2
USIBLE LINK BLOCK 7
JECTOR NO. 1
JECTOR NO. 2
JECTOR NO. 3
JECTOR NO. 4 6
7
8
M

67
IG 1 12 I 5 B-O
B-W(
A/T)
R-W
G-R
B-Y
B-RB-R B-R B-O
B-R B-R B-R B-R B-R B-RB-R
B
B-O
B
G-
B-
B-
R-Y
Y-GN 1
FROM A/C AMPLIFIER
TO A/C AMPLIFIERB-
B-
B-Y
B-RIG 1 10
EA1 9
EC B (
M/T)I 4
I 4I 4I 5I 5
I 5 B
BR
B
B BR
B
R
(
M/T)(
A/T) (
A/T)
(
A/T)
(
A/T)
(
A/T)
JU N TO R J 2
TO ST RELAY
B-R
B-R
B-R
B-R E
A AA B-W
B
-WB-W(
M/T)
(
A/T)
(
A/T) JUNCTION CONNECTOR J 5
C 1
BATTC 22
NEWA 10
IS C OA 9
ISC CA 23
EGRB 8
TPCA 22
EVP
C 11STA
C 14FC
A 11#20
A 12#10
C 21ACT
C 10AC1 2 1P
N
B BR
R
Y
RB-L
B-Y
B-W
R-W
P R-W
B-WPARK/NEUTRAL
POSITION SW NOISE FILTER
(
IGNITION SYSTEM)ENGINE CONTROL MODULEB E 4 , E 5AC, E 6
A 24 A25
Y
R
IB2 20
A 3
B 6 B 5A 2(
2W D)
(
4W D)
(
2WD)
(
4WD)
I 5
B-W
B-W B-W
B-W (
M/T) (
M/T)
(
A/T)
(
A/T) C C 8
B P 1 , A#40 #30
(
A/T)
AC C A
B B-W
B-W(
A/T)
(
A/T)(
M/T) CTION CONNECJUN CTIO N
CONNECTOR J 513
ID
C
V
NSI 1 2
2 1
1 2 2LE AIR
ONTROL VALVE
VSV (
EGR)
(
VAPOR PRESSUR
OR)
VSV (
EVAP) 1
V 7
V 8 VS
SE V 9
2 1LUTCH START SW

68
ENGINE CONTROL
I 4 IG 1 9
C 12
+BB 6
OX1B 5
OX2B 15
TE 1
B 2PIM
B 1VC
B 11VTA
B 3TH A
B 4TH W
B 7PTNK
B 9E2 B- R B- R B-O
BR
BR
Y
BR BR BR
B-R B-R
L-W B- R
BR LG-R
YY
L-R
Y-B
W
L- Y
BR BR
BR
B
B
BR
BR(
SHIELDED) (
SHIELDED)
A 5
G+ A 4
NE+A 17
NE -A 3
IG F
C 17ELS
B 10KNK
2
B B
(
SHIELDED)
(
SHIELDED)
MANIFOLD
ABSO LUTE
PRESSURE
SENSORTHROTTLE
POSITION
SENSOR
FROM TAI
RELAY (
L)
FR O M D EF
RELAY (
L)
CK
SO R ENGINE CONTROL MODULEB E 4 , E 5
AC, E 6
ENSOR
A 2 G-
A 1 G+ IGNITION COIL AND DISTRIBUTOR
I I 2 B1
B2
DISTRIBUTOR
B-O
BB-O
IG N ITIO N
COIL
A 20
IG T
R
G
R
B
L-Y (
SHIELDED)
BRB-O
1 2
1 2
OXYGEN SENSOR
(
BANK 1 SENSO R1)
OXYGEN SENSOR
(
BANK 1 SENSO R2) O 2
O 3
L
TO CRUISE
CONTROL ECU
V V
BR
B BBR
BR (
SHIELDED) (
SHIELDED)
I 5 I 5 I 5 I 4
DATA LINK CO NNECTOR 1 D 1
(
SHIELDED) (
SHIELDED)
B
TO A/C
AM PLIFIER
B-W
I 4W
G
I 5
B I 3 , I 4
A
IG2 8
1 2
CRANKSHAFT POSITION
SENSOR C 2
G
1 2
1 2
1 3 232
E2
Y
R
R
Y
L-Y
VCC PTNK1
G
BL-R
L Y
INTAKE AIR TEM P. SENSOR I 9
DIO
(
EN D 4
LLIG H T
OGGER
KNO
SEN K 1
ENGINE COOLANT TEMP. S E 2
IG 1 5
APOR PRESSURE SENSOR 1
I 5
8 12 3
TE 1+B E1
534
-C B TAC
IG T IG F
21 GNITER
3 1DE
GINE IDLE-UP)
1E2 VC PIM
M 11 432
T 1

69
BR BR
BR
EC A 13EO1
A 26EO2
A 14E1
C 5W
C 9SPD
BR
BR
BR
G-R
V-W
BR BR
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
ENGINE CONTROL MODULEB E 4 , E 5
AC, E 6 B/K
G-W
C 4 (
SHIELDED)
BR B 16
I 5
BR
C 16
I11
IG 2 11
IG FROM POWER SOURCE SYSTEM (
SEE PAGE 54)
L
BR W
W-B BR
W-BW
BR
V-W
G-RR-L
BR BR
BR
BR
EO 3 SDL
(
A/T)
JU NC J10(
SHIELDED)
D DG-W
G-W
NCTION
NNECTORR-WFUS
BLO F 8
LG
R- W STOP LIGHT SW S 5(
A/T)
1I 141I 13
1I 11
1F2
1E 2
1B 1
254 16
SDL SG CG BATDATA LINK
CONNECTOR 3 D 2
AABR
BR
BR
BR
BR
J 2
JU NC TIO N
CONNECTOR
A AB A
BR
A A
TIO N C O NN EC TO RB , J 1 1 A
10A
GAUGE 10A
STOP
18 4 15 3
E
CK7. 5A
OBD
17
12
JU
CO J 5
AAAAAA
A

70
ENGINE CONTROL
IG 2 10 IG 2 9 IG 1 28 R-L
R-L
R-L
L-B
R-YL-B
R-
V- W
G-R
VEHICLE SPE ED SENSOR
(
CO MBINATION M ETER) COMBINATION
METER C 9
G-R V-WR-B J10 , J11
A
A C
B B
B B LJUNCTION CONNECTOR
R-L
11 1 0 2 9
Y
3 2 1
V 2
MALFANCTION
INDICATOR LAMP
SPEED
1B8
1E8

71
E 4 (A), E 5 (B), E 6 (C) ENGINE CONTROL MODULE
BATT -E1 : ALWAYS 9.0-14.0 VOLTS
+B -E1 :9.0-14.0 VOLTS (IGNITION SW AT ON POSITION)
VC -E2 :4-5-5.5 VOLTS (IGNITION SW AT ON POSITION)
VTA -E2 :0.3-0.8 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED)
:3.2-4.9 VOLTS (IGNITION SW ON AND THROTTLE VALVE OPEN)
PIM -E2 :3.3-3.9 VOLTS (IGNITION SW AT ON POSITION)
#10,#20, #30, #40-E01, E02 : 9.0-14.0 VOLTS (IGNITION SW AT ON POSITION)
THA -E2 :0.5-3.4 VOLTS (IGNITION SW ON AND THE INTAKE AIR TEMP 20
C, 68
F)
THW -E2 :0.2-1.0 VOLTS (IGNITION SW ON AND THE COOLANT TEMP 80
C, 176
F)
STA -E1 :6.0-14.0 VOLTS (ENGINE CRANKING)
IGT -E1 :0.8-1.2 VOLTS (ENGINE CRANKING OR IDLING)
W -E1 :9.0-14.0 VOLTS (NO TROUBLE AND ENGINE RUNNING)
ACT -E1 :4.5-5.5 VOLTS (IGNITION SW ON AND AIR CONDITIONING ON)
AC1 -E1 :0-3.0 VOLTS (IGNITION SW ON AND AIR CONDITIONING ON)
ISCO, ISCC-E1 :9.0-14.0 VOLTS (IGNITION SW AT ON POSITION)
TE1 -E1 :9.0-14.0 VOLTS (IGNITION SW ON AND DATA LINK CONNECTOR 1 TE1-E1 NOT CONNECTED)
:0-3.0 VOLTS (IGNITION SW ON AND DATA LINK CONNECTOR 1 TE1-E1 CONNECTED)
NSW -E1 :0-3.0 VOLTS (IGNITION SW ON AND PARK/NEUTRAL POSITION SW P OR N RANGE)
:9.0-14.0 VOLTS (IGNITION SW ON AND PARK/NEUTRAL POSITION SW EXCEPT POSITION P AND N RANGE)
RESISTANCE OF ENGINE CONTROL MODULE WIRING CONNECTOR
(DISCONNECT WIRING CONNECTOR)
VTA -E2 :3.3-10.0 KW (THROTTLE VALVE FULLY OPEN)
:0.2-0.8 KW (THROTTLE VALVE FULLY CLOSED)
VC -E2 :3.0-7.0 KW
THA -E2 :2.0-3.0 KW (INTAKE AIR TEMP 20
C, 68
F)
THW -E2 :0.2-0.4 KW (COOLANT TEMP 80
C, 176
F)
G+ -G- :0.17-0.21 KW
ISCO, ISCC-+B :19.3-22.3 W
(5) CIRCUIT OPENING RELAY
(5) 3 -(5) 5 : CLOSED WITH THE IGNITION SW ON OR ST POSITION
(6) EFI MAIN RELAY
(6) 3-(6) 5 : CLOSED WITH THE IGNITION SW ON OR ST POSITION
E 2 ENGINE COOLANT TEMP. SENSOR
1-2 :14.6-17.8 KW (-20
C, -4
F)
5.88 KW (0
C, 32
F)
2.21-2.69 KW (20
C, 68
F)
1.14 KW (40
C, 104
F)
0.584 KW (60
C, 140
F)
0.29-0.354 KW (80
C, 176
F)
I 5, I 6, I 7, I 8 INJECTOR
1-2 : APPROX. 13.8 W
T 1 THROTTLE POSITION SENSOR
3-1 :0.2-5.7 KW WITH CLEARANCE BETWEEN LEVER AND THE STOP SCREW 0 MM (0 IN.)
3-1 :2.0-10.2 KW WITH THROTTLE VALVE FULLY OPEN
2-1 : LESS THAN 2.3 KW WITH CLEARANCE BETWEEN THE LEVER AND THE STOP SCREW 0.5 MM (0.02 IN.)
WITH CLEARANCE BETWEEN LEVER AND THE STOP SCREW 0.7 MM (0.028 IN.)
SERVICE HINTS

72
ENGINE CONTROL
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C 228I 229K 129
C 830I 3A29M 129
C 930I 4B29N 129
D 128I 529O 229
D 230I 629O 329
D 430I 729P1A29
E 228I 829P 1B29
E 4A31I 929S 531
E 5B31I 1031T 129
E 6C31J 131V 129
F 728J 231V 229
F 831J 531V 729
F1132 (2-DOOR), 33 (4-DOOR)J10A31V 829
I 129J11B31V 929
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
223R/B NO. 2 (ENGINE COMPARTMENT LEFT)
524R/B NO. 5 (LEFT KICK PANEL)
625R/B NO. 6 (ENGINE COMPARTMENT LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1 B20INSTRUMENT PANEL WIRE AND J/B NO 1 (LOWER FINISH PANEL)1 D20INSTRUMENT PANEL WIRE AND J/B NO. 1 (LOWER FINISH PANEL)
1 E20FUSE BLOCK ASSY WIRE AND J/B NO 1 (LOWER FINISH PANEL)1 F20FUSE BLOCK ASSY WIRE AND J/B NO. 1 (LOWER FINISH PANEL)
1 H
1 I20INSTRUMENT PANEL WIRE AND J/B NO. 1 (LOWER FINISH PANEL)
1 J
()
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EA134ENGINE WIRE AND ENGINE ROOM MAIN WIRE (INSIDE OF R/B NO. 2)
IB136ENGINE ROOM MAIN WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)
IB236ENGINE ROOM MAIN WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IG138ENGINE WIRE AND INSTRUMENT PANEL WIRE (UNDER THE INSTRUMENT PANEL CENTER)IG238ENGINE WIRE AND INSTRUMENT PANEL WIRE (UNDER THE INSTRUMENT PA N E L CENTER)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA34RADIATOR RIGHT
EC34INTAKE MANIFOLD
IG36RIGHT KICK PANEL
BH38 (2-DOOR)UNDER THE CENTER PILLAR LHBH40 (4-DOOR)UNDER THE CENTER PILLAR LH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E 134ENGINE ROOM MAIN WIREI 538ENGINE WIRE
I 138INSTRUMENT PANEL WIREI1138INSTRUMENT PANEL WIRE
I 438ENGINE WIRE