Toyota 4Runner 2003 User Manual
Power Source
B- R
10A MI R HEATER
2
12
30A DEFOG
12
B- L
2
Y- G
2
Y- R
B- R
W- B
B
B- Y
DEFOG Relay
2
2
3
2
2
30A TOWING BRK
2
30A BATT CHG 50A AM1
21 W- L
2
1
2
5
4
12
12
12
12
12
12
12
15A AC1 15V I NV
12
R
50A HEAT ER
50A AI R SUS
50A J/B
40A TOWING
10A STOP
R
2
L- Y
L- W
L
G- W
V
L- Y
BR- Y
1
1C
2
2
2
2
2
2
12
22
10A AIRSUS NO. 2
4
4
5
1
AIR SUS Relay
10A SECU /HORN
30A P P/SEAT
30A D P/SEAT
12
30A POWER
5
1
3
2
3
2
GR
L- B
4
W- B
4
10A TAIL
R
58
140A ALT
1212
2
2
2
BB
Battery
15A FR FOG
12
7. 5A OBD
IG Relay
5
1
3
2
2
2
B- Y
2
W- B
2
Y- R
2
2003 4RUNNER (EWD514U)
TAIL Relay
LG
15A PWR OUTLET
O
25A SEAT HEATER
12
22
LG
2
2
HEATER Relay
1
5
4
2
2
3
2
2
W- G L
B- Y
W- B
7. 5A HEATER NO. 2
12
22
W- L
G- YR
2
AM1
I18
Ignition SW
ACC
IG1
3
4
W- G
L- Y
W- L
W
W- G
B- R
7. 5A ALT- S
21
2
10A HORN
21
2
15A A/F HEATER
21
2
30A AM2
12
40A ABS MTR
1
50A ABS SOL
12
Short Pin
12
20A EFI
12
10A ETCS
12
20A DR/LCK
12
20A TOWING
12
2
2
Y- B
2
2
2
2
2
G- W
2
2
GR
GR
7
R
Y
W
L
AM2
10A HEAD(HI RH
12
10A HEAD(HI LH
2
12
IG2
ST2
6
8
)
)
B- R
G- B
W
L
R- W
2
R- L
2
B- Y
15A TRN- HAZ
21
2
20A RADIO NO. 2
12
HEAD Relay
5
1
3
2
W- L
2
2
2
2003 4RUNNER (EWD514U)
10A HEAD(LO RH
R- B
R- B
W
2
12
10A HEAD(LO LH
12
)
R- B
2
)
R- Y
2
59
Power Source
7. 5A ACC
W- G
L- Y
B- R
G- B
W- G
5
1D
2
1C
6
1D
3
1D
10A CIG
15A IG1
10A ECU- IG
15A RR WSH
20A 4WD
30A FR WIP- WSH
10A I GN
7. 5A GAUGE
10A SRS
7. 5A STA NO. 2
10A DOME
12
2
R
20A RAD IO NO. 1
W
L
W- G
L
2
2
2
12
10A EC U- B
12
EFI Relay
1
5
2
2
3
22
L- Y
2
W- R
2
W- B
10A EF I NO. 2
BL-W
(
)(
2UZ- FE
12
2
2UZ- FE
)
60
2003 4RUNNER (EWD514U)
Service Hints
HEAD Relay
5-3 : Closed with light control SW at HEAD position or dimmer SW at FLASH position
Closed with engine running and parking brake lever released (w/ daytime running light)
I18 Ignition SW
2-3 : Closed with ignition key at ACC or ON position
2-4 : Closed with ignition key at ON or ST position
7-6 : Closed with ignition key at ON or ST position
7-8 : Closed with ignition key at ST position
TAIL Relay
3-5 : Closed with light control SW at TAIL or HEAD position
: Parts Location
Code See Page Code See Page Code See Page
I18 37
:
Relay Blocks
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
4 23 Engine Room R/B No.4 (Engine Compartment Left)
:
Junction Block and Wire Harness Connector
Code See Page Junction Block and Wire Harness (Connector Location)
1C
1D
24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
2003 4RUNNER (EWD514U)
61
Starting
78AM2 IG2
ST2
G- B
* 1 : 2UZ- FE
* 2 : 1GR-FE
* 3 : 1GR- FE Cold Area Spec.
* 4 : 1GR- FE Except Cold Area Spec.
7. 5A
STA
NO. 2
(*1)
(*2)
G- BL- Y
1D3
1K2
L- Y
(*1)
IM26
(*2)
IM24
I18
Ignition SW
E 6
RRB
2
2
30A
AM2
1
2
R
R
B- Y
22
51
STA Relay
32
22
Y- G
W- B
(*1)
EA16
(*2)
EA14
)
*1
(
Y- G
B- YB- Y
GG
J35
Junction
Connecto r
G
B- Y
)
B
BB
(
Combination Meter
, J 3
)
A
(
J 2
Junction
Connect or
AB
)
Y
*2
(
B- Y
IM111IC4D2
B- Y
P
N
P 1
Park/Neutral
Position SW
B- Y
(*1)
D
(*2)
A
J28
Junction
Connecto r
D
AA
B- Y
6
9
PP
(*1)
A
(*2)
D
D
62
Battery
B- L
(*3)
B- R
(*1)
W
(*4)
1
S 2(A), S 3(B
Starter
J28
Junction
Connect or
B1
MA
)
W- B
EB
A
A16 B9A17 C12
NSW STAR STA STSW
E 4(A), E 5(B), E 6(C
Engine Control Module
(*1)
A
(*2)
DD
P
B- Y B- Y
)
2003 4RUNNER (EWD514U)
Service Hints
I18 Ignition SW
7-8 : Closed with the ignition SW at ST position
S2 (A), S3 (B) Starter
Points closed with the shift lever at P or N position and the ignition SW at ST position
: Parts Location
Code See Page Code See Page Code See Page
E4 A 37
E5 B 37
E6 C 37 J28 38
I18 37 J35 38
J2 A
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
Code See Page Junction Block and Wire Harness (Connector Location)
1D 24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1K 25 Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
33 (2UZ-FE)
35 (1GR-FE)
:
Relay Blocks
:
Junction Block and Wire Harness Connector
J3 B
P1
33 (2UZ-FE)
35 (1GR-FE)
33 (2UZ-FE)
35 (1GR-FE)
S2 A
S3 B
33 (2UZ-FE)
35 (1GR-FE)
33 (2UZ-FE)
35 (1GR-FE)
:
Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1
IC4 48 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
IM1
IM2
Code See Page Ground Points Location
EB
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E6 44 (2UZ-FE) Engine Room Main Wire E6 46 (1GR-FE) Engine Room Main Wire
44 (2UZ-FE)
46 (1GR-FE)
52 Engine Wire and Instrument Panel Wire (Right Side of Blower Unit)
:
Ground Points
44 (2UZ-FE)
46 (1GR-FE)
:
Splice Points
Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
Front Left Fender
2003 4RUNNER (EWD514U)
63
Ignition (2UZ-FE)
76AM2 IG2
I18
Ignition SW
R RB
B- R
ST2
EA14
B- RB- R
EB16
B- R B- RB- R
E 5
B- R
14 14 14
B- R
W- B
E 2
E 5
W- B
E 3 E 3
B- R
W- B
B- R
E 2
B- RB- R
W- B
B- R
B- R
W- BW- B
E 3
W- B
41
I 1
Ignition Coil and
2
2
30A
AM2
1
2
Battery
Igniter No. 1
32 32 32
LG
LG
924 823 25 11
IGT1
R- Y
E 3
R- Y
I 2
Ignition Coil and
Igniter No. 2
LG- B
LG- B
IGT2
R- W
E 3
R- W
IGF2
E 4
Engine Control Module
R- YR- Y
R- W
I 3
Ignition Coil and
Igniter No. 3
L- W
L- W
IGT3IGF1
R- W
E 3
R- Y
R- W
I 4
Ignition Coil and
Igniter No. 4
IGT4
23
L- Y
L- Y
R- Y
R- Y
E 3
R- W
64
2003 4RUNNER (EWD514U)
B- R B- R B- RB- R
E 2
E 2
B- R
R- Y
R- W
E 5
E 3
B- R
I 5
Ignition Coil and
Igniter No. 5
B- L
B- L
W- B
41
23
R- W
E 3
B- R
W- BW- B
R- Y
R- W
E 5
W- B
E 3
B- R
I 6
Ignition Coil and
Igniter No. 6
G
G
W- B
41
23
R- Y
E 3
R- Y
R- W
B- R
I 7
Ignition Coil and
Igniter No. 7
G- W
G- W
E 3
W- B
41
23
R- Y
B- R
W- B
E 3
B- R
I 8
Ignition Coil and
Igniter No. 8
G- B
G- B
W- B
41
23
R- W
W- B
W- B
B- R
)
2
Ignition No. 1
N 1
Noise Filter
(
1
BR
)
2
Ignition No. 2
N 2
Noise Filter
(
1
BR B- R
12 26 13 10
IGT5
IGT6
E 4
Engine Control Module
IGT7
2003 4RUNNER (EWD514U)
IGT8
EE
ED
EC
65
Ignition (2UZ-FE)
Service Hints
I18 Ignition SW
7-6 : Closed with the ignition SW at ON or ST position
: Parts Location
Code See Page Code See Page Code See Page
E4 37 I4 33 (2UZ-FE) I8 33 (2UZ-FE)
I1 33 (2UZ-FE) I5 33 (2UZ-FE) I18 37
I2 33 (2UZ-FE) I6 33 (2UZ-FE) N1 33 (2UZ-FE)
I3 33 (2UZ-FE) I7 33 (2UZ-FE) N2 33 (2UZ-FE)
:
Relay Blocks
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
:
Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1 44 (2UZ-FE) Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
EB1 44 (2UZ-FE) Engine No.2 Wire and Engine Wire (Near the Starter)
:
Ground Points
Code See Page Ground Points Location
EC 44 (2UZ-FE) Right Bank Cylinder Head
ED 44 (2UZ-FE) Left Bank Cylinder Head
EE 44 (2UZ-FE) Rear Side of Right Bank Cylinder Block
:
Splice Points
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E2
44 (2UZ-FE) Engine Wire
E3
E5 44 (2UZ-FE) Engine Wire
66
2003 4RUNNER (EWD514U)
Memo
2003 4RUNNER (EWD514U)
67
Ignition (1GR-FE)
76AM2 IG2
I18
Ignition SW
R RB
B- R
ST2
1D6
1H4
B- RB- R
IM113
E 5 E 5
E12 E12
B- R
14 14 14
W- B
B- R
W- B
W- B
B- R
41
E12
W- B
B- R
W- BW- B
B- RB- R
W- B
E 5
B- R
I 1
Ignition Coil and
2
2
30A
AM2
1
2
Battery
Igniter No. 1
32 32 32
Y- R
Y- R
824 9 10 11
IGT1
W- R
E 9 E 9 E 9
W- R
I 2
Ignition Coil and
Igniter No. 2
P- L
P- L
IGT2
W- R
E 4
Engine Control Module
I 3
Ignition Coil and
Igniter No. 3
LG
LG
IGT3IGF
W- R
I 4
Ignition Coil and
Igniter No. 4
IGT4
23
LG- B
LG- B
W- R
W- RW- RW- RW- R
E 9
68
2003 4RUNNER (EWD514U)
B- R
E 5
B- R
E 5
E12
B- R
41
I 5
Ignition Coil and
Igniter No. 5
GR
W- R W- R
GR
12 13
IGT5
23
W- BW- B
W- B
W- R
E 9
E12
B- R
I 6
Ignition Coil and
Igniter No. 6
L
L
IGT6
W- B
41
23
W- R
W- B
W- B
B- R
)
2
Ignition No. 1
N 1
Noise Filter
(
1
W- B
E12
W- B
E 4
Engine Control Module
EF
69
2003 4RUNNER (EWD514U)
Ignition (1GR-FE)
Service Hints
I18 Ignition SW
7-6 : Closed with the ignition SW at ON or ST position
: Parts Location
Code See Page Code See Page Code See Page
E4 37 I3 35 (1GR-FE) I6 35 (1GR-FE)
I1 35 (1GR-FE) I4 35 (1GR-FE) I18 37
I2 35 (1GR-FE) I5 35 (1GR-FE) N1 35 (1GR-FE)
:
Relay Blocks
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
:
Junction Block and Wire Harness Connector
Code See Page Junction Block and Wire Harness (Connector Location)
1D 24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1H 25 Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
:
Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IM1 52 Engine Wire and Instrument Panel Wire (Right Side of Blower Unit)
:
Ground Points
Code See Page Ground Points Location
EF 46 (1GR-FE) Rear Side of Left Bank Cylinder Block
:
Splice Points
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E5
46 (1GR-FE) Engine Wire
E9
E12 46 (1GR-FE) Engine Wire
70
2003 4RUNNER (EWD514U)
Memo
2003 4RUNNER (EWD514U)
71
Charging
ACC
2
W- L
W
2
W- L
2
2
1
2
140A A LT 50A AM1
1
2
B
22 2
R
R
22
AM1
7
I18
Ignition SW
W
IG1
IG2
ST2
4
L- Y
6AM2
B- R
B 4
Body ECU
)
B
(
, J19
)
A
(
J18
Junction
EA12
EA11
14
Connector
L
BE
AAAA
IC4D6
GR GR GR
EA15
EA13
B- R
L- Y
1D6
7. 5A
GAUGE
1G4
R- L
C15
)
D
(
Charge
, C1 1
)
C
(
C10
Combination Meter
D8
GR
BG
)
B
(
, J 9
)
A
(
AG
J 8
Junction
Connecto r
GR
1C2
15A
IG1
1E20
Y- RY- RY- R
E
Junction
Connecto r
E
D
J 1 J 1
Junction
Connector
D
(
2UZ- FE
(
1GR-FE
)
)
EA13
EA12
72
30A AM2
7. 5A ALT- S
11
2
B
Battery
W
GR
Y- R
B4B2B1A1
LIG B
S
IC Regulator
G 1(A), G 2(B
Gener ator
)
2003 4RUNNER (EWD514U)
Y- R
W
g()
Service Hints
G2 (B) Generator
(B) 1-Ground : 13.2-14.0 volts with the engine running at 5000 rpm and 115°C (239°F)
(B) 4-Ground : 0-4 volts with the ignition SW at ON position and the engine not running
: Parts Location
Code See Page Code See Page Code See Page
B4 36
C10 C 37
C11 D 37 I18 37 J18 A 38
G1 A
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
Code See Page Junction Block and Wire Harness (Connector Location)
1C
1D
1E
1G 25 Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
32 (2UZ-FE)
34 (1GR-FE)
:
Relay Blocks
:
Junction Block and Wire Harness Connector
24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
G2 B
J1
32 (2UZ-FE) J8 A 38
34 (1GR-FE) J9 B 38
33 (2UZ-FE) J19 B 38
35 (1GR-FE)
:
Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1
IC4 48 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
44 (2UZ-FE)
46 (1GR-FE)
Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
2003 4RUNNER (EWD514U)
73
Engine Control (2UZ-FE)
AM1
76AM2
I18
Ignition SW
ACC
IG1
ST1
IG2
ST2
From Power Source Syste m (See Page 58
7. 5A
ACC
1K8
P
3EF
3EF
B- R
P
IC35
P
2
32
L
2
L
)
1
20A
EFI
2
2
L
L
W- G
22 22
15
L
B
B- O
51
W- G
W- G
L
B- R
B- O
B- W
ACC CUT
Relay
41
2
2
GR
RR
2
2
30A AM2
1
2
B
Battery
W- G
EFI Relay
23
22 22
W- B
B
J 2
Junction
Connect or
B
W- B
B
10A
EFI
NO. 2
B
E 6
B
2
1
2
2
L- W
A
J 4
Junction
Connect or
A
L- W
IC317
C/OPN Relay
32
B
A
L- W
B- W
B
IC4C3 IC4C15
B
GR- B
GR- B
GR- B
GR- B
B
L- W
L- W
74
EB
2003 4RUNNER (EWD514U)
EA1
1
B- R B- RB- R
EB1
3
B- R
W- G
W- G
L
B- R
B- O
B- W
B- W
22
23
FUEL PUMP
Relay
15
222
B- Y
G- R
IC4D5
G- R
IM219
G- R
B- R
P 1
Park/Neutral
W- G
B- R
I 2
L
B- R
61D
C
4
B- R
I 1
B- R
2
1
B- R
F 8
J 4
Junction
Connector
C
B- O B- O
B- O
2
IB1
B- R
4
M
F14
Fuel Pump
Resistor
Fuel Pump
5
W- B
BABA
)
B
(
, J41
)
A
(
J40
Junction
Connector
AA
W- B
10A
IGN
)
A
(
1J111E23
BA
J 8
Junction
Connector
BA
B- O B- O
W- B
IC4C4
L
E3E
BATT MREL
IGSW
9E E2
B- O
)
B
(
BB
, J32
)
A
(
J31
Junction
Connector
AB
B- O
W- G
IC4C17
W- G
8
E 4(A), E 5(B), E 6(C), E 7(D), E 8(E
Engine Control Module
FPR FC
G- R
IC316
W- G
IM25
W- G
15 A
ACCR
A33 E10
GR- B
Position SW
J28
B
)
B
(
, J32
)
A
(
J31
Junction
Connector
B
P
N
9
PP
A
Junction
Connector
A
16 A
NSWB9STAR
)
BABA
AC
+B2
B
6
STA Relay
B- Y
D
D
DA
P
B- Y B- Y
A17
STA
CCV+B
27 A1E
R- G
IM217
IE1C3
)
R- G R- GB
1
Canister Closed Valve
(
2
V10
VSV
GR- B
B
L- W
L- W
IB21
L- W
L- W
W- B
W- B
BLBO
75
2003 4RUNNER (EWD514U)
Engine Control (2UZ-FE)
B- R B- R B- R B- R B- R B- R B- R
Combinatio n Meter
R- L
PTNK
E21
O
E 3
B- R
1
I 9
Injector No. 1
2
A
A
A
R- L R- L
1A
#1
E 3
B- R
1
I10
Injector No. 2
2
L
J26
Junction
Connector
2#2A3
L- R
BR
E 3
B- R
1
I11
Injector No. 3
I12
2
W
A4
#3
VC
A18
L- RL- R
B
B
B
E 3E 3
B- R
1
Injector No. 4
2
Y
A5
#4
VTA1
A21
Y
J26
Junction
Connector
B- R
1
I13
Injector No. 5
2
G
A
#5
E 4(A), E 5(B), E 6(C), E 7(D), E 8(E
Engine Control Module
VTA2
A31
R- B
E 3
B- R
1
I14
Injector No. 6
2
R
3#6B
M+
C3
)
R
*1
(
E 3
B- R
1
I15
Injector No. 7
2
W
6#7C
)
GE01
M-
C17
C2
G
B- RBR
1
I16
Injector No. 8
2
5#8C
THW
A19
R- L
R- Y
2
I 1
Ignition Coil and
Igniter No. 1
LG
A9
IGT1
VG
W- R
I 2
Ignition Coil and
Igniter No. 2
E2G
A30
A29
B- W
R- Y
R- W
2
33
LG- B
A8
IGT2
THA
A20
Y- B
OO
IE1A10 IE1A16 IE1A17
BC2
10
O
231
PTNK VCC GND
V 8
Vapor Pressur e Sensor
L- R
L- R
BC28BC216
L- R
76
IM222IM27
BR
BR
BR
56421
T 2
Throt tle Con trol Motor
Throt tle Po sition Sensor
313
BR
I 8
2
1
E 2
Engine Coolant
Temp. Se nsor
BR
BRBRBR
I 8
18
IM2
542
M 1
Mass Air Flow
Meter
BR
I 8
THAE2GVGVC VTA1 VTA2 M+ M-
+BE2E2
L- W
BR
L- W
L- WL- W
2003 4RUNNER (EWD514U)
* 1 : Shielded
R- Y
R- W R- W R- W R- W
R- W
I 3
Ignition Coil and
Igniter No. 3
333333
L- W
A25
IGT3
PRG
A34
E2
A28
E 3
R- Y
I 4
Ignition Coil and
Igniter No. 4
L- Y
A11
IGT4
OX2A
B22
R- Y R- Y
R- W
222
I 5
Ignition Coil and
Igniter No. 5
B- L
A12
IGT5
E 4(A), E 5(B), E 6(C), E 7(D), E 8(E
Engine Control Module
HT2A
B33
R- Y
R- W
A13
E 3E 3E 3
R- W
2
I 8
Ignition Coil and
Igniter No. 8
MG CLT Relay
R- Y
A2423 A
IGF1
B- Y
D2
ACMG
LCKI
C23
G- B
A10
IGT8
OX2B
B21
R- W
IGF2
HT2B
B25
I 7
HT1A
E 3
R- Y
22
Ignition Coil and
Igniter No. 7
G- W
IGT7
)
B4
E 3
R- Y
I 6
Ignition Coil and
Igniter No. 6
G
A26
IGT6
OX1A
B23
BR
L- W
L- W
V 2
1
)
EVAP
(
VSV
2
)
*1
BR
Y- R
L- W
(
BR
I 8
L- W L- W
G
+B E1 +B E1 +B E1
24 24
L- W
L- W
E
E
E
J28
Junction
Connector
B- L
BR
I 8 I 8 I 8
E
L- W
E
L- WE
E
)
*1
(
)
Bank 2 Sensor 1
H 7
Heated Oxygen Sensor
(
I 9
R
OX HT OX HTHTOX
L- W
BR BR
LG
BR
)
*1
(
)
Bank 1 Sensor 1
H 5
Heated Oxygen Sensor
(
BR BRBR BRBR
W
313131
24
L- W
PBR
R- Y
)
A/C Lock Sensor
Bank 2 Sensor 2
H 8
Heated Oxygen Sensor
(
BR
(*1)
L- W
2003 4RUNNER (EWD514U)
77
Engine Control (2UZ-FE)
A24
Accel Position Sensor
VPA1 VPA2 VCP1 VCP2 EP1 EP2
634152
W- R
W- R
VPA
R- B
R- B
23 EE22
VPA2
B- Y
B- Y
E27
VCPA
W- L
W- L
E26
VCP2
LG- B
IC4C11 IC389IC3A8 IC4C13 IC4C16 IC4
LG- B
E28
EPAEEPA2
V- W
V- W
29
E 4(A), E 5(B), E 6(C), E 7(D), E 8(E
Engine Control Module
From Power Source System (See Page 58
11
7. 5A
STA
NO. 2
2
1K2
L- YL- Y
IM26
12 C
STSW
)
2
GRGR
IC4C5
6D
+BM
10A
ETCS
)
10A
STOP
2
2
G- W
2
S12
Stop Light SW
1
G- Y
E
J 4
Junction
Connector
E
G- Y
G- Y
3CB
3CB
G- Y
IC315
AH
)
B
(
, J32
)
A
(
BE
J31
Junction
Connector
G- Y
19 D
STP
BR
(*1)
BR
OX1B
)
*1
(
31
24
I 9
HT1B
B29
B
OX HT
+B E1
L- W
G- Y
BR
B5
)
Bank 1 Sensor 2
H 6
Heated Oxygen Sensor
(
BR
BR
NE+
)
L
*1
(
1
C 4
Crankshaf t
Position Sensor
2
NE-
C25
C24
Y
I 9
BR
C
C
C
C
)
*1
(
C 1
Camshaft
C
J28
Junction
Connector
G2+
B
1
Position Sensor
2
G2-
C27
C32
W
I 9
BR
BR
KNK2
B2
)
W
*1
(
(*1)
EB11EB14
)
W
*1
(
11
K 2
Knock Sensor 2
EB12
E 3
BR
BR
E 4
KNK1
B1
)
B
*1
(
)
B
*1
(
K 1
Knock Sensor 1
78
L- W
BR
EF
2003 4RUNNER (EWD514U)
* 1 : Shielded
GR- R
T 8
Transp onder Key
Computer
EFIO
6
W- R
)
B
(
, J32
)
A
(
J31
Junction
Connector
EFII
7
L- R
D27 4 D
26 D
IMO
THWO
ACLD
D14
BH
AE
L- B L- B
3DC
3DC
L- B
D33
B- R
IK14IK12IK13
B- R
F 9
4WD Control
ECU
24
)
B
(
J30
Junction
Connector
THE
D32
GR- G
GR- G
)
4WD
(
A32
Airbag Sensor
Assembly
GSW2
23
L
IL12
L
14 E
F/PS
W- B
)
B
(
, J34
)
A
(
J33
Junction
Connector
BCBC
R- Y
P- L
R- Y
)
B
(
AF
, J36
)
A
(
J35
Junction
Connector
BH
R- Y
E18
SILIMI
SPD TACH
D17
15 E1D
W- B
AB
5E E12
V- R
P- L
)
B
(
AE
, J30
)
A
(
J29
Junction
Connector
BA
P- L
20 E
TC
W
11 E
R- B
B- W
R- W
R- W
19 E
WFSE
ELSEOMHP4WDE1ME01E03E02E01
L- R
II14
L- R
15
ELS1
S 8(B), S 9(C
Skid Control ECU
L4
)
W- L
4WD
(
BH
BH
)
W- L
4WD
(
L4
NEO ENG+ ENG- TRC+ TRC-
C7C14 C22 C24 C16
P
17 E
NEO
A/CS
D31
BR- B
BR- B
)
R
24 E
ENG+
E 4(A), E 5(B), E 6(C), E 7(D), E 8(E
Engine Control Module
W- B
W- B
W
30 E
ENG-
7C6A7A 4C
W- B
B
25 E
TRC+
W- B
B16
SP1
Y
31 E
TRC-
)
8B1C
BR
BR
CC
J26
C
Junction
Connector
A7A18 B7B17
ACLDTWI
A16(A), A17(B
A/C Control Assembly
THE
)
ACS
B 4
Body ECU
BR
W- B
W- B
W- B
W- B
EE
EF
A
W- B
IK
J37
Junction
Connector
R- B
B- W
V- R
79
2003 4RUNNER (EWD514U)
Engine Control (2UZ-FE)
GR- R
R- Y
P- L
R- W
2
O
3C A
3CCC
P- L
HG
J18
Junction
Connecto r
HG
R- WBR
15 13 7 16
WFSE TC SIL BATT
SG CG
5
IM29
P- L
D 1
Data Link Connec tor 3
3A
A3A
R- Y R- Y
IC4C14
O
4
W- B
E
E
2
7. 5A
OBD
J22
Junction
Connector
From Power Sourc e Syste m (See Page 5 8
7. 5A
GAUGE
1G4
)
B
R- L
C15 C16
Malfunction
Indicator Lamp
)
C
(
, C10
)
B
(
, C 9
)
A
(
C 8
Combination Meter
A76BB5
4B
R- B
GR- R
(
, J 9
)
A
(
J 8
Junction
)
B
(
, J 9
)
A
(
J 8
Junction
Connector
)
11
10A
DOME
R
AH
Connector
BF
R
B- W
BC
AC
B- W
D
J 7
Junction
Connector
D
R
Speedometer
V- R
1G1
1K11
3DB
3DB
2
2
R
IC4C2
Tachomet er
C13
BR
IM17
80
R- B
B- W
V- R
BR
BR
W- B
W- B
A
J 5
Junction
Connector
IGEF
2003 4RUNNER (EWD514U)
)
B
(
AG
, J32
)
A
(
J31
Junc tion
Connector
BF
B- W
V- R V- R
)
B
(
AB
, J30
)
A
(
J29
Junc tion
Connector
BD
V- R
BR
EF
System Outline
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outline
of the engine control is given here.
1. Input Signals
(1) Engine coolant temp. signal circuit
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. The engine coolant temp. is input into TERMINAL THW of the engine
control module as a control signal.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal to TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust emission is detected and is input as a control signal from the heated oxygen sensors
to TERMINALS OX1A, OX1B, OX2A and OX2B of the engine control module.
(4) RPM signal circuit
The camshaft position is detected by the camshaft position sensor and is input into TERMINAL G2+ of the engine
control module as a control signal. Also, the engine RPM is detected by the crankshaft position sensor and the signal is
input into TERMINAL NE+ of the engine control module.
(5) Throttle position sensor signal circuit
The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINALS
VTA1 and VTA2 of the engine control module.
(6) Vehicle speed circuit
The vehicle speed sensor detects the vehicle speed, and the signal is input into TERMINAL SPD of the engine control
module via the combination meter, from TERMINAL SP1 of the skid control ECU.
(7) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, the
voltage for engine control module start up power supply is applied through the EFI relay, to TERMINALS +B and +B2 of
the engine control module. The current from the IGN fuse flows to TERMINAL IGSW of the engine control module, and
voltage is constantly applied to TERMINAL +BM.
(8) Intake air volume signal circuit
The intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of the
engine control module.
(9) Stop light SW signal circuit
The stop light SW is used to detect whether the vehicle is braking or not, and the signal is input into TERMINAL STP of
the engine control module as a control signal.
(10)Starter signal circuit
To confirm whether the engine is cranking, the voltage applied to the starter motor when the engine is cranking is
detected, and is input into TERMINAL STA of the engine control module as a control signal.
(11) Engine knock signal circuit
Engine knocking is detected by the knock sensors, and is input into TERMINALS KNK1 and KNK2 of the engine control
module as a control signal.
(12)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 A/CS
of the engine control module.
2003 4RUNNER (EWD514U)
81
Engine Control (2UZ-FE)
2. Control System
∗ SFI system
The SFI system monitors the engine condition through the signals input from each sensors to the engine control module.
The control signal is sent to the engine control module TERMINALS #1, #2, #3, #4, #5, #6, #7 and #8 to operate the
injector (Fuel injection). The SFI system controls the fuel injection by the engine control module in response to the driving
conditions.
∗ ESA system
The ESA system monitors the engine condition through the signals input from each sensors to the engine control module.
The best ignition timing is decided according to this data and the data memorized in the engine control module. The
control signal is output to TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 and IGT8, and these signals control the
igniter to provide the best ignition timing.
∗ Heated oxygen sensor heater control system
The heated oxygen sensor heater control system turns the heater on when the intake air volume is low (Temp. of exhaust
emission is low), and warms up the heated oxygen sensors to improve their detection performance. The engine control
module evaluates the signals from each sensors, and outputs current to TERMINALS HT1A, HT1B, HT2A or HT2B to
control the heater.
∗ Fuel pump control system
The engine control module supplies current to TERMINAL FPR, and controls the operation speed of the fuel pump with
the FUEL PUMP relay.
∗ ACIS
The 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.
∗ ETCS-i
The ETCS-i controls the engine output at its optimal level in accordance with the opening of the accelerator pedal, under
all driving conditions.
∗ Engine start control system
The engine control module allows power to be supplied from the TERMINAL STAR to the STA relay via park/neutral
position SW until complete combustion is confirmed by engine RPM after the detection of ignition SW ST signal by the
TERMINAL STSW.
With this arrangement, engine can be started without holding the ignition key in the ST position. At the same time, the
TERMINAL ACCR is controlled so that the engine control module turns off ACC CUT relay, shutting off power to the
accessories.
3. 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 be found by reading the code displayed on the malfunction indicator lamp.
4. Fail-Safe System
When a malfunction has occurred in any system, there is a possibility of causing engine trouble due to continued control
based on that system. In that case, the fail-safe system either controls the system using the data (Standard values)
recorded in the engine control module memory, or else stops the engine.
82
2003 4RUNNER (EWD514U)
Service Hints
EFI Relay
5-3 : Closed with the ignition SW at ON position
E2 Engine Coolant Temp. Sensor
1-2 : Approx. 15.0 kΩ (-20°C, -4° F)
:Approx. 2.45 kΩ (20°C, 68°F)
:Approx. 0.32 kΩ (80°C, 176°F)
:Approx. 0.14 kΩ (110°C, 230°F)
E4 (A), E5 (B), E6 (C), E7 (D), E8 (E) Engine Control Module
BATT-E1 : Always 9.0-14.0 volts
+BM-E1 : Always 9.0-14.0 volts
IGSW-E1 : 9.0-14.0 volts with the ignition SW at ON position
+B, +B2-E1 : 9.0-14.0 volts with the ignition SW at ON position
VC-E1 : 4.5-5.5 volts with the ignition SW at ON position
VTA2-E1 : 2.0-2.9 volts with the ignition SW on and throttle valve fully closed
: 4.7-5.1 volts with the ignition SW on and throttle valve fully open
VTA1-E1 : 0.4-1.0 volts with the ignition SW on and throttle valve fully closed
: 3.2-4.8 volts with the ignition SW on and throttle valve fully open
VPA-E1 : 0.3-0.9 volts with the ignition SW on and throttle valve fully closed
: 3.2-4.8 volts with the ignition SW on and throttle valve fully open
VPA2-E1 : 1.8-2.7 volts with the ignition SW on and throttle valve fully closed
: 4.7-5.1 volts with the ignition SW on and throttle valve fully open
THA-E1 : 0.5-3.4 volts with the idling, intake air temp. 0°C (32° F) -80°C (176°F)
THW-E1 : 0.2-1.0 volts with the idling, engine coolant temp. 60°C (140°F) -120°C (248°F)
STA-E1 : 6.0 volts or more with the engine cranking
W-E1 : 9.0-14.0 volts with the idling and malfunction indicator lamp off
SPD-E1 : Pulse generation with the vehicle moving
STP-E1 : 7.5-14.0 volts with the brake pedal depressed
: Parts Location
Code See Page Code See Page Code See Page
A16 A 36 I2 33 (2UZ-FE) J28 38
A17 B 36 I3 33 (2UZ-FE) J29 A 38
A24 36 I4 33 (2UZ-FE) J30 B 38
A32 36 I5 33 (2UZ-FE) J31 A 38
B4 36 I6 33 (2UZ-FE) J32 B 38
C1 32 (2UZ-FE) I7 33 (2UZ-FE) J33 A 38
C4 32 (2UZ-FE) I8 33 (2UZ-FE) J34 B 38
C8 A 37 I9 33 (2UZ-FE) J35 A 38
C9 B 37 I10 33 (2UZ-FE) J36 B 38
C10 C 37 I11 33 (2UZ-FE) J37 38
D1 37 I12 33 (2UZ-FE) J40 A 40
E2 32 (2UZ-FE) I13 33 (2UZ-FE) J41 B 40
E4 A 37 I14 33 (2UZ-FE) K1 33 (2UZ-FE)
E5 B 37 I15 33 (2UZ-FE) K2 33 (2UZ-FE)
E6 C 37 I16 33 (2UZ-FE) M1 33 (2UZ-FE)
E7 D 37 I18 37 P1 33 (2UZ-FE)
E8 E 37 J2 33 (2UZ-FE) S8 B 39
F8 32 (2UZ-FE) J4 38 S9 C 39
F9 37 J5 38 S12 39
F14 40 J7 38 T2 33 (2UZ-FE)
H5 32 (2UZ-FE) J8 A 38 T8 39
H6 32 (2UZ-FE) J9 B 38 V2 33 (2UZ-FE)
H7 32 (2UZ-FE) J18 38 V8 41
H8 32 (2UZ-FE) J22 38 V10 41
I1 33 (2UZ-FE) J26 38
2003 4RUNNER (EWD514U)
83
Engine Control (2UZ-FE)
()
:
Relay Blocks
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
:
Junction Block and Wire Harness Connector
Code See Page Junction Block and Wire Harness (Connector Location)
1D
1G
3C
3D
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1 44 (2UZ-FE) Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
EB1 44 (2UZ-FE) Engine No.2 Wire and Engine Wire (Near the Starter)
IB1
IB2
IC3
IC4
IE1 50 Instrument Panel Wire and Floor No.2 Wire (Left Kick Panel)
IK1 50 Instrument Panel Wire and Instrument Panel Wire (Left Upper Side of the Glove Box)
IL1 50 Instrument Panel Wire and Instrument Panel Wire (Right Upper Side of the Glove Box)
IM1
IM2
BC2 54 Frame Wire and Floor No.2 Wire (Under the Rear LH Seat)
24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1E
1J
25 Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
1K
3A
28 Instrument Panel Wire and Center J/B (Instrument Panel Brace RH)
3E
:
Connector Joining Wire Harness and Wire Harness
48 Floor No.2 Wire and Engine Room Main Wire (Left Kick Panel)
48 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
II1 50 Instrument Panel Wire and Instrument Panel Wire (Instrument Panel Brace LH)
52 Engine Wire and Instrument Panel Wire (Right Side of Blower Unit)
:
Ground Points
Code See Page Ground Points Location
EB 44 (2UZ-FE) Front Left Fender
EE 44 (2UZ-FE) Rear Side of Right Bank Cylinder Block
EF 44 (2UZ-FE) Rear Side of Left Bank Cylinder Block
IG 48 Left Kick Panel
IK 48 Right Kick Panel
BL 54 Floor Seat Crossmember LH
BO 54 Rear Pillar LH
:
Splice Points
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E3 44 (2UZ-FE) Engine Wire I2 50 Engine Room Main Wire
E4 44 (2UZ-FE) Engine No.2 Wire I8
E6 44 (2UZ-FE)
I1 50
Engine Room Main Wire
50 Engine Wire
I9
84
2003 4RUNNER (EWD514U)
Memo
2003 4RUNNER (EWD514U)
85
Engine Control (1GR-FE)
AM1
76AM2
I18
Ignition SW
ACC
IG1
IG2
ST2
7. 5A
ACC
1K8
P
F3E
3EF
P
5IC3
P
22
32
From Power Source Syste m (See Page 58
15A
A/F HEATER
22
2
L
J 4
Junc tion
Connector
B
B- R
L
B- R
W- G
2
2
51
)
11
20A
EFI
2
B
B
L
W- G
22 22
15
L
B
B- O
51
W- G
L
B- R
B- O
B- W
ACC CUT Relay
41
22
GR
RR
2
2
30A AM2
1
2
B
Battery
W- G
A/F HEATER Relay
32
2
W
IC4C1
W
IM14
EFI Relay
23
2
W- B
22 22
B
W- B
B
B
J 2
Junction
B
W- B
Connect or
B
E 6
B
C/OPN Relay
32
B- W
B
IC4C3 IC4C15
B
GR- B
GR- B
GR- B
GR- B
B
B
W
W- G
86
EB
2003 4RUNNER (EWD514U)
B- R
W- G
L
B- R
B- O
B- W
B- W
22
23
FUEL PUMP
Relay
15
22 2
Y- B
B- Y
IC4D5
Y- B
IM219
Y- B
B- R
P 1
Park/Neutral
Position SW
IM15
L
B- R
1D61H3
C
4
F 8
Fuel Pump
J 4
Junction
Connector
C
B- O B- O
Connector
IB12
B- R
4
M
5
W- B
BABA
AA
W- B
B- O
F14
Fuel Pump
B- R
B- R
I 1
B- R
2
Resistor
1
)
B
(
, J41
)
A
(
J40
Junction
W- B
10A
IGN
)
A
(
J 8
B- R
IC4C4
L
E3E
BATT MREL
IGSW
1J111E23
AB
Junction
Connector
AB
B- O B- O
9E E2
B- O
BB
)
B
(
, J32
)
A
(
AB
J31
Junction
Connector
B- O
W- G
IC4C17
GR- B
P
B9
STAR
ACCR
A14
W- G
5IM2
W- GW- G
16 IC3
W- G
8
E 4(A), E 5(B), E 6(C), E 7(D), E 8(E
Engine Control Module
FPR FC
A33 E10
Y- B
P
N
D
16 A
9
PP
D
D
NSW
6
STA Relay
B- Y
A
A
STA
)
+B1
B
BABA
)
B
(
, J32
)
A
(
AC
J31
Junction
CA
Connecto r
B
A
J28
Junction
Connector
B- Y B- Y
A17
CCV+B
27 A1E
B
B
R- G
IM217
IE1C3
)
R- G R- GB
1
Canister Closed Valve
(
2
V10
VSV
GR- B
B
B
W
W- G
IB21
B
W
B
BLBO
87
2003 4RUNNER (EWD514U)
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