Toyota 4Runner 2003 User Manual

Power Source

	10A MIR HEATER
B- R	1	2
	2

30A DEFOG

1

2

DEFOG Relay

B- L

2

Y- G

2

Y- R

B- R

W- B

B

B- Y

B

B

Battery

2

2

2

2

2

2

2

2

2	1	2	R					R
3	5	1	2	R		1	2	GR
				2	L- Y	2		2
	4		50A HEATER			10A AIRSUS NO. 2
		1	2	2	L- Y	5	3	L- B
						4		4
30A TOWING BRK			50A AIR SUS		BR- Y	1	2	W- B
						4		4
2	1					AIR SUS Relay

30A BATT CHG

2

1

	50A AM1
1	2			W- L
	2
	50A J/B
1	2	L- W	1	10A SECU/HORN
	2		1C
	40A TOWING			30A P P/SEAT
1	2	L		30A D P/SEAT
	2

140A ALT

1

2

	10A STOP
1	2	G- W
		2
	15A AC115V INV
1	2	V
		2
	15A FR FOG
1	2	LG
		2

1 2

30A POWER

5	3	10A TAIL
1	2
	TAIL Relay
15A PWR OUTLET

	7. 5A OBD
1	2	O
		2

	IG Relay		25A SEAT HEATER
5	3	B- Y	1	2	LG
	2		2		2
1	2	W- B
	2
	2	Y- R

58

2003 4RUNNER (EWD514U)

	HEATER Relay
W- G	1	2	L
2		2		7.	5A HEATER NO. 2
R	5	3	B- Y	1	2	G- Y
2		2	2			2
		4	W- B
		2

W- L

		7. 5A ALT- S
W	2	1
	2
		10A HORN
W- G	2	1
	2
		15A A/F HEATER
B- R	2	1
	2
		15A TRNHAZ
B- Y	2	1
	2

30A AM2
1	2	2
40A ABS MTR
1	2	Y- B
		2
50A ABS SOL
1	2	Y
		2
Short Pin
1	2	W
		2
20A EFI
1	2	L
		2
10A ETCS
1	2	GR
		2
20A DR/LCK

1

2

20A TOWING

1

2

20A RADIO NO. 2
1	2

G- W

2

GR

2

W- L

2

	HEAD Relay
5	3	2
1	2	W
		2

I18

Ignition SW

		ACC	3	W- G
W- L	2 AM1	IG1	4	L- Y

R	7 AM2	IG2	6	B- R
		ST2	8	G- B

W

L

2

B-

R

R- B

2

10A HEAD(HI RH)
1	2

10A HEAD(HI LH)
1	2

10A HEAD(LO RH)
1	2

10A HEAD(LO LH)
1	2

R- W

2

R- L

2

R- B

2

R- Y

2

59

2003 4RUNNER (EWD514U)

Power Source

W- G

L- Y

B- R

G- B

W

L

W- G

W- G

L

7. 5A ACC

5

10A CIG

1D

15A IG1

10A ECUIG

15A RR WSH

20A 4WD

2	30A FR WIPWSH

1C

10A IGN

6	7. 5A GAUGE

1D

10A SRS

3	7. 5A STA NO. 2

1D

	10A DOME
1	2	2	R
20A RADIO NO. 1
1	2	2	L- Y
2
	10A ECU- B
1	2	2	W- R
EFI Relay
1	2	W- B
2	2			10A EFI NO. 2
5	3	B	1	2	L- W
2	2	(2UZFE)	2		2
					(2UZFE)

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		24	Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
	1D

61

2003 4RUNNER (EWD514U)

Starting

7 AM2			IG2

ST2 8

I18

Ignition SW

R

R

E 6

R

2

2

30A

AM2

1

2

B

B- L

(* 3)

B- R

(* 1)

W

(* 4)

Battery

* 1 : 2UZFE

* 2 : 1GRFE

* 3 : 1GRFE Cold Area Spec.

* 4 : 1GRFE Except Cold Area Spec.

G- B

G- B

3

1D

7. 5A

STA

NO. 2

B- Y

B- Y

B- Y

2

1K

R

2

2

D2

IC4

11 IM1

Y

B-

RelaySTA

5

1

B- Y

B- Y

D

(*1)

J35

Junction Connector

J28

Junction Connector

Y-L

G

G

A

(*2)

3

2

G

D

D

(* 1)

A

A

(* 2)

2

2

Y

Y

Y

B-

B-

B-

Y- G

W- B

J,J3(B)2(A)

Junction Connector

CombinationMeter

P 1 Park/Neutral Position SW

6

P

P

N

6

EA1

(* 1)

B

B

9

6

IM2

(*1)

4

EA1

(* 2)

4

IM2

(*2)

Y- G

B

A

(*1)

Y

(*2)

A

(* 1)

J28

Junction Connector

Y-L

D

(* 2)

1

B

A

A

(*1)

D

D

(*2)

1

M

W- B

P

P

B- Y

A

S 2(A), S 3(B)

16

A

9 B

17

A

12

C

Starter

NSW

STAR

STA

STSW

E 4(A), E 5(B), E 6(C)

Engine Control Module

EB

62

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	J3		B	33 (2UZ-FE)	S2		A	33 (2UZ-FE)
E5		B	37				35 (1GR-FE)				35 (1GR-FE)
E6		C	37		J28		38	S3		B	33 (2UZ-FE)
I18			37		J35		38				35 (1GR-FE)
J2		A	33 (2UZ-FE)		P1		33 (2UZ-FE)
			35 (1GR-FE)				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)
	1K			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)
	EA1			44 (2UZ-FE)	Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
				46 (1GR-FE)
	IC4			48	Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
	IM1			52	Engine Wire and Instrument Panel Wire (Right Side of Blower Unit)
	IM2
			: Ground Points
	Code			See Page	Ground Points Location
	EB			44 (2UZ-FE)	Front Left Fender
				46 (1GR-FE)
			: Splice Points
	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

63

2003 4RUNNER (EWD514U)

Ignition (2UZ-FE)

7

AM2

IG2

6

B- R

ST2

I18

4

EA1

Ignition SW

R

B- R

6

EB1

B- R

B- R

E 2

B- R

E 2

B- R

E 5

B- R

B- R

E 5

B- R

B- R

W- B

W- B

W- B

E 3

E 3

E 3

B- R

W- B

B- R

W- B

B- R

W- B

B- R

W- B

R

1

4

1

4

1

4

1

4

2

I 1

Ignition Coil and Igniter No. 1

3

I 2

Ignition Coil and

Igniter No. 2

3

I 3 Ignition Coil and

Igniter No. 3

3

I 4 Ignition Coil and

Igniter No. 4

2

2

2

2

3

2

R- Y

LG- B

R- W

L- W

R- W

L- Y

R- Y

30A

LG

AM2

R- Y

R- Y

R- Y

R- Y

1

E 3

E 3

R- W

R- W

R- W

2

E 3

E 3

B

LG

R- Y

LG- B

R- W

L- W

L- Y

9

24

8

23

25

11

IGT1

IGF1

IGT2

IGF2

IGT3

IGT4

Battery

E 4

Engine Control Module

64

2003 4RUNNER (EWD514U)

B- R		B- R	B- R			E 2		B- R
		E 2
B- R		B- R		E 5		B- R
E 5
W- B	E 3	W- B	W- B		E 3	W- B	E 3
			E 3
B- R	W- B	B- R	W- B	B- R	W- B	B- R	W- B	W- B
1	4	1	4	1	4	1	4

I 5 Ignition Coil and

Igniter No. 5

2

I 6 Ignition Coil and

Igniter No. 6

2

I 7 Ignition Coil and

Igniter No. 7

2

I 8

Ignition Coil and

Igniter No. 8

N 1

Noise Filter (Ignition No. 1)

3

3

3

3

2

B- L

R- W

G

R- Y

G- W

R- Y

G- B

R- W

R- Y

R- Y

E 3

R- Y

R- W

E 3

R- W

R- W

B- L

G

G- W

G- B

W- B

12

26

13

10

IGT5

IGT6

IGT7

IGT8

E 4

Engine Control Module

EE

B- R

2

1

BR

ED

N 2 Noise Filter (Ignition No. 2)

B- R

2

1

BR

EC

65

2003 4RUNNER (EWD514U)

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

E5

44 (2UZ-FE)

Engine Wire

E3

66

2003 4RUNNER (EWD514U)

Memo

67

2003 4RUNNER (EWD514U)

Ignition (1GR-FE)

7 AM2	IG2 6	B- R
	ST2
I18		6	1D
Ignition SW
R
		4	1H
			B- R
		13	IM1
			B- R

E 5

B- R

E 5

B- R

E 5

B- R

E12

W- B

E12

W- B

W- B

E12

B- R

W- B

B- R

W- B

B- R

W- B

B- R

W- B

R

1

4

1

4

1

4

1

4

I 1

Ignition Coil and

Igniter No. 1

2

I 2 Ignition Coil and

Igniter No. 2

2

I 3 Ignition Coil and

Igniter No. 3

2

I 4 Ignition Coil and

Igniter No. 4

2

2

3

3

3

3

2

Y- R

W- R

P- L

W- R

W- R

LG- B

W- R

30A

LG

AM2

E 9

W- R

E 9

W- R

E 9

W- R

W- R

1

E 9

2

Y- R

W- R

P- L

LG

LG- B

B

8

24

9

10

11

IGT1

IGF

IGT2

IGT3

IGT4

Battery

E 4

Engine Control Module

68

2003 4RUNNER (EWD514U)

B- R	E 5		B- R	E 5
W- B		E12	W- B		E12
	B- R	W- B		B- R	W- B	W- B
	1	4		1	4
I 5 Ignition Coil and	Igniter No. 5	2	I 6 Ignition Coil and	Igniter No. 6	2	N 1	Noise Filter (Ignition No. 1)
	3			3
	GR	W- R		L	W- R	W- B
W- R		E 9	W- R
	GR			L
	12			13
	IGT5			IGT6
		E 4
		Engine Control Module

B- R

2

1

W- B

E12

W- B

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

E12

46 (1GR-FE)

Engine Wire

E9

70

2003 4RUNNER (EWD514U)

Memo

71

2003 4RUNNER (EWD514U)

Charging

W- L

W	W- L		R

2 2

2

50A AM1

1

2

140A ALT

1

2

B		R

2 2

2

30A AM2

1

2

B

ACC

2 AM1

IG1 4

L- Y

7 AM2			IG2 6		B- R

ST2

B- R			Y
			L-
6	1D	2	1C
	7. 5A		15A
	GAUGE		IG1

I18

4

1G

20

1E

Ignition SW

R- L

B 4

R

Body ECU

15

C

Y-

GR

,C11(D)C10(C)

MeterCombination

Junction Connector

R-Y

Charge

1J

E

L

14

E

E B

8

D

,J19(B)J18(A)

JunctionConnectorA A

1J

Junction Connector

A A

GR

D

GR

J8(A), J 9(B)

G B

D

Junction Connector

R-Y

W

D6

IC4

G A

2

GR

GR

2

2

EA1

5

EA1

3 EA1 (2UZFE)

1

EA1

3

EA1

2 EA1

(1GRFE)

ALT- S

Y- R

W

7. 5A

1

W

GR

Y- R

1 B 4 B 2 B

1

A

S

L

IG

B

IC Regulator

Battery

G 1(A), G 2(B)

Generator

72

2003 4RUNNER (EWD514U)

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	G2		B	32 (2UZ-FE)	J8		A	38
C10		C	37				34 (1GR-FE)	J9		B	38
C11		D	37	I18			37	J18		A	38
G1		A	32 (2UZ-FE)	J1			33 (2UZ-FE)	J19		B	38
			34 (1GR-FE)				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)
	1C			24	Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
	1D
	1E
	1G			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)
	EA1			44 (2UZ-FE)	Engine No.2 Wire and Engine Room Main Wire (Under the Engine Room R/B)
				46 (1GR-FE)
	IC4			48	Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)

73

2003 4RUNNER (EWD514U)

Engine Control (2UZ-FE)

			From Power Source System (See Page 58)
						1
				7. 5A				20A
				ACC				EFI
						2
		8	1K			2
	ACC	P			L	L
AM1	IG1
		F	3E
	ST1
		F	3E
7 AM2	IG2 6	B- R
	ST2	P
R		5	IC3	L	G	L	L	B	B- O
I18					W-
Ignition SW		P
			2	2	2	2		2	2

	3	2	1	5	5	1
ACC CUT	Relay	1	EFI Relay	3	C/OPN Relay	2
	4		2		3

B

2

2

2

2

2

2

R

GR

G-W

B

E 6

B

W-B

-GRB

B

2

2

B

GR- B

2

1

30AAM2

W- B

EFI

C3

IC4

C15

IC4

10A

NO. 2

1

2

B

2

2

B

GR-

B

Junction Connector

Junction

Connector

L- W

2J

B

4J

A

A

Battery

B

A

L- W

L- W

17

IC3

W- B

EB

74

W- G

W- G

L

B- R

B- O

B- W

GR- B

B

L- W

L- W

2003 4RUNNER (EWD514U)

W- G

W- G

L

B- R

B- O

B- W

	B- W
2	2

FUEL PUMP	2	3
		4
	Relay	5
	1

	2	2	2
	G- R	B- Y	B- R
			B- R
			I 1
D5	IC4		B- R
	G- R		2
			F 8 Fuel Pump Resistor
19	IM2		1
	G- R

GR- B

B

L- W

L- W

B- R

		B- R		I 2
			B- R
	B- O		6	1D
4J Junction Connector
	C	10A
		IGN
	C
	B- O
	23	1E	11	1J
	B- O		O
2			B-

IB1		R-B	J8(A)	Junction Connector	A
				B
				B	A
	Pump	4
		M		B- O
F14	Fuel	5
		W- B

J40(A), J41(B)	A	B	A	B
	Junction Connector	A
	A

W- B

W- B

W- B

W- B

BO

BL

B- R

1

B- R

3

B- R

B- R

EA1

EB1

G-W

1P

Park/Neutral SWPosition

6

STARelay

P

N

9

16

IC3

P

B- Y

B- Y

G-W

J28

Junction Connector

L

G-W

A

D

D

C4

IC4

C17

IC4

5

IM2

A

A

D

L

W- G

W- G

P

P

B- Y

3 E

8 E

15 A

16 A

9 B 17 A

BATT

MREL

ACCR

NSW

STAR

STA

E 4(A), E 5(B), E 6(C), E 7(D), E 8(E)

Engine Control Module

IGSW

FPR

FC

+B

+B2

CCV

9 E

33 A

10 E

1 E

2 E

27 A

B- O

G- R

GR- B

B

B

R- G

J31(A), J32(B)

B B

J31(A), J32(B)

A B

A B

Junction Connector

Junction Connector

17

G

IM2

B A

C A

R-

B- O

B

C3

IE1

R- G

Valve)

1

(Canister Closed

2

VSV

V10

B

1

IB2

L- W

L- W

75

2003 4RUNNER (EWD514U)

Engine Control (2UZ-FE)

B- R

E 3

B- R

B- R

B- R

B- R

B- R

B- R

E 3

R- Y

E 3

E 3

E 3

E 3

E 3

R- W

Meter

9I

No.Injector1

B- R

I10

B- R

I11

B- R

B- R

I13

B- R

B- R

I15 No.Injector7

B- R

I16

No.Injector8

B- R

1I

CoilIgnitionand

No.Igniter1

R- Y

2I

CoilIgnitionand

No.Igniter2

Combination

1

No.Injector2

No.Injector3

I12 No.Injector4

No.Injector5

I14 No.Injector6

1

1

2

2

1

1

1

1

1

2

2

2

2

2

2

2

2

3

3

R- L

R- L

J26 Junction Connector L

W

W

BR

LG

B-LG

A

A

Y

G

R

A

R- L

1 A

2 A

3 A

4 A

5 A

3 B

6 C

5 C

9 A

8 A

#1

# 2

# 3

#4

# 5

# 6

#7

# 8

IGT1

IGT2

E 4(A), E 5(B), E 6(C), E 7(D), E 8(E)

Engine Control Module

PTNK

VC

VTA1

VTA2

M+

M-

GE01

THW

VG

E2G

THA

21 E

18

A

21

A

31

A

3 C

2 C

17

C

19

A

30

A

29

A

20

A

O

L- R

J26 Junction Connector Y

B-R

*1)(

R

G

L-R

R-W

W-B

B-Y

B

L- R

B

BR

B

L- R

7

IM2

22

IM2

5

6

4

2

1

EngineCoolant

2

5

4

2

VC

VTA1

VTA2

M+

M-

2E

Temp.Sensor 1

1M

AirMassFlow

Meter

VG

E2G

THA

A10

IE1

A16

IE1

A17

IE1

E2

E2

+B

O

RL-

BR

T 2

3

1

3

O

-LR

BR

Throttle Control Motor

BR

BR

BR

W-L

Throttle Position Sensor

10

BC2

8

BC2

16

BC2

BR

I 8

BR

I 8

BR

I 8

BR

O

L- R

BR

2

3

1

PTNK

VCC

GND

V 8

Vapor Pressure Sensor

L- W

L- W

18

L- W

IM2

76

2003 4RUNNER (EWD514U)

* 1 : Shielded

R- Y

E 3

R- Y

R- W

E 3

R- W

R- W

E 3

R- W

R- Y

R- W

I 3 Ignition Coil and

2

Ignition Coil and

2

Ignition Coil and

2

Igniter No. 3

3

I 4

Igniter No. 4

3

I 5

Igniter No. 5

3

L- W

L- Y

B- L

25

A

11

A

12

A

IGT3

IGT4

IGT5

PRG

E2

OX2A

HT2A

34

A

28

A

22

B

33 B

Y- R

BR

(* 1)

G

B- L

VSV(EVAP)

1

3

1

Sensor 1)

2V

2

+B

E1

7H

HeatedOxygen 2(BankSensor

OX

HT

2

4

L- W

BR

L- W

BR

BR

I 8

BR

I 8

BR

		L- W
		E
L- W	E	E	L- W
L- W	E	E	L- W
L- W	E	E	L- W
		J28

Junction

Connector

E 3

R- Y

E 3

R- Y

R- W

R- W

E 3

R- Y

R- Y

R- W

I 6 Ignition Coil and

2

Ignition Coil and Igniter No. 7

2

I 8 Ignition Coil and

2

Igniter No. 6

I 7

3

Igniter No. 8

3

3

G

G- W

G- B

R- W

R- Y

26 A

13

A

10

A

23

A

24

A

IGT6

IGT7

IGT8

IGF2

IGF1

E 4(A), E 5(B), E 6(C), E 7(D), E 8(E)

Engine Control Module

OX1A

HT1A

OX2B

HT2B

23 B

4

B

21

B

25

B

(* 1)

R

LG

*1)

W

P

(

3

1

Sensor 1)

3

1

Sensor 2)

OX

HT

Oxygen Sensor

OX

HT

Oxygen Sensor

+B

E1

H5

Heated (Bank1

+B

E1

H8

Heated (Bank2

2

4

2

4

L- W

BR

L- W

BR

BR

I 8

BR

BR

I 8

BR

I 9

MG CLT Relay

B- Y

2 D

ACMG

LCKI

23 C

R- Y

A/C Lock Sensor

BR

(* 1)

BR

L- W

77

2003 4RUNNER (EWD514U)

Engine Control (2UZ-FE)

From Power Source System (See Page 58)

			1
			7. 5A
			STA
			NO. 2
A24			2
Accel Position Sensor	2	1K	2

VPA1

VPA2

VCP1

VCP2

EP1

EP2

L- Y

GR

6

3

4

1

5

2

W- R

R- B

B- Y

W- L

LG- B

V- W

6

IM2

C5

IC4

C16

IC4

C13

IC4

A8

IC4

9 IC3

C11

IC4

8

IC3

W- R

R- B

B- Y

W- L

LG- B

V- W

L- Y

GR

22

E

23

E

26

E

27 E

28

E

29

E

12

C

6

D

VPA

VPA2

VCPA

VCP2

EPA

EPA2

STSW

+BM

E 4(A), E 5(B), E 6(C), E 7(D), E 8(E)

Engine Control Module

OX1B

HT1B

NE+

NE-

G2+

29

B

5 B

25

C

24 C

27

C

(* 1)

B

G- Y

(* 1)

L

Y

(* 1)

B

I 9

3

1

Sensor 2)

4C Crankshaft SensorPosition

1

1C Camshaft SensorPosition

1

OX

HT

6H OxygenHeated Sensor1(Bank

BR

+B

E1

2

4

2

2

L- W

BR

BR

(* 1)

C

I 9

BR

C

C

BR

J28

BR

BR

C

Junction

Connector

C

BR

L- W

EF

			1
10A
ETCS
			2
			2
			G- W
		Stop Light SW	2
	S12		1
			G- Y
	Junction Connector		E
J 4			E

G2-

32 C

W

I 9

BR

10A
STOP
			G- Y
B		3C
B		3C		H A
	G- Y		J31(A), J32(B)
				JunctionConnectorE
15	IC3				B
G- Y				G- Y
				19	D
				STP
	KNK2				KNK1
2		B			1	B
*1)	W			*1)	B
(				(
				E 3

(* 1)		BR
1	EB1	2 EB1		4 EB1
*1)	W	BR	*1)	B
(			(
		E 4
	1			1
K 2 Knock Sensor 2			K 1	Knock Sensor 1

78

2003 4RUNNER (EWD514U)

T 8		F 9		S 8(B), S 9(C)
Transponder Key		4WD Control						16	B
Computer		ECU		Skid Control ECU
									SP1
EFIO	EFII		L4	NEO	ENG+	ENG-	TRC+	TRC-
6	7	24		7 C	14 C	22 C	24 C	16	C
		W- L	(4WD)

-WR

R-L

J30(B) Junction Connector

H B

P

R

W

B

Y

H B

W- L

(4WD)

27

D

26

D

4

D

17

E

24 E

30

E

25

E

31 E

IMI

IMO

L4

NEO

ENG+

ENG-

TRC+

TRC-

E 4(A), E 5(B), E 6(C), E 7(D), E 8(E)

Engine Control Module

THWO

ACLD

THE

A/CS

E01

E02

E03

ME01

E1

4WD

14 D

33 D

32 D

31 D

7 A

6 A

7 C

4 C

1 C

8 B

L- B

H B

J31(A)J32(B),JunctionConnectorE

A

B- R

GR- G

BR- B

W- B

W- B

W- B

W- B

BR

BR (4WD)

L- B

4

IK1

2

IK1

3

IK1

C 3D

C

C

C

3D

B- R

GR- G

BR- B

C

J26

B-L

Junction

Connector

7

A

18 A

7

B

17 B

TWI

ACLD

THE

ACS

BR

A16(A), A17(B)

A/C Control Assembly

W- B

W- B

W- B

W- B

EE

EF

* 1 : Shielded

								GR- R
A32
Airbag Sensor
Assembly
								R- Y
GSW2								P- L
23
L		R- Y			P- L			R- W
	J35(A), J36(B)			J29(A), J30(B)
		F	A		E	A
2 IL1		Junction Connector	B		Junction Connector
		H			A B
L		Y			L		W
		R-			P-		R-
14 E		18	E		20	E	19	E
F/PS		SIL			TC		WFSE

HP	EOM	SPD	TACH	W	ELS
1 D	15 E	17 D	5 E	11 E	12 E

W- B

W- B

V- R

B- W

R- B

L- R

			4	II1
J33(A), J34(B)	C B	C B		L- R
	Junction Connector
				15
		B	A	ELS1

			B 4
			Body ECU
W- B			R- B
			B- W
			V- R

A

J37

Junction

Connector

IK

79

2003 4RUNNER (EWD514U)

Engine Control (2UZ-FE)

From Power Source System (See Page 58)

1

7. 5A

7. 5A

GR- R

OBD

GAUGE

2

2

4 1G

J,J9(B)8(A)

Junction Connector

R- Y

O

-RL

H

A

P- L

C 3C

A

3A

F

B

R

R- W

C14

IC4

15

C

16

C

C 3C

A

3A

W-R

J18

Junction Connector

P- L

R- Y

O

Malfunction LampIndicator

L-P

Y-R

H

G

H

G

,C,CC10(C)9(B)8(A)

MeterCombination

15

13

7

16

WFSE

TC

SIL

BATT

SG

CG

5

D 1

4

7

A

4

B

6

B

Data Link Connector 3

R- B

GR- R

B- W

J 8(A), J 9(B)

C B

BR

W- B

Junction Connector

C A

E

J22

W

9

IM2

Junction

B-

Connector

E

BR

J31(A), J32(B)

G A

W- B

Junction

Connector

B

F

R- B

W

B-

B- W

V- R

BR

W- B

A

J 5

Junction

Connector

EF

IG

80

2003 4RUNNER (EWD514U)

			1
		10A
		DOME
R			2
7J	Junction Connector		2
		D	R
		D	IC4
		C2
		R

Speedometer

Tachometer

5	B	13	C
V- R		BR
1	1G
11	1K
V- R		7	IM1
B	3D

	B	3D
J29(A), J30(B)	V- R
	B A
	Junction Connector
	D B
	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.

81

2003 4RUNNER (EWD514U)

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
VTA1-E1	: 4.7-5.1 volts with the ignition SW on and throttle valve fully open
	: 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

THA-E1

: 4.7-5.1 volts with the ignition SW on and throttle valve fully open

: 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

83

2003 4RUNNER (EWD514U)

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			24		Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
	1E
	1G			25		Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
	1J
	1K
	3A
	3C			28		Instrument Panel Wire and Center J/B (Instrument Panel Brace RH)
	3D
	3E
			: 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)
	IB1			48		Floor No.2 Wire and Engine Room Main Wire (Left Kick Panel)
	IB2
	IC3			48		Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
	IC4
	IE1			50		Instrument Panel Wire and Floor No.2 Wire (Left Kick Panel)
	II1			50		Instrument Panel Wire and Instrument Panel Wire (Instrument Panel Brace LH)
	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			52		Engine Wire and Instrument Panel Wire (Right Side of Blower Unit)
	IM2
	BC2			54		Frame Wire and Floor No.2 Wire (Under the Rear LH Seat)

:	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	50	Engine Wire
	E6	44 (2UZ-FE)	Engine Room Main Wire	I9
	I1	50

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2003 4RUNNER (EWD514U)

Memo

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2003 4RUNNER (EWD514U)

Engine Control (1GR-FE)

ACC

AM1 IG1

7 AM2	IG2	6
	ST2
R
I18
Ignition SW

R

2

2 AM230A

1

2

B

Battery

8 1K

P

F 3E

F 3E

P

5 IC3

		P
		2
	ACC CUT Relay	3
		4
		2
		GR

From Power Source System (See Page 58)
		1				1
7. 5A			15A				20A
ACC			A/F HEATER				EFI
		2				2
		2				2
			L
			J 4
			Junction
			Connector		B						W- G
			B		B						L
	B- R										B- R
											B- O
		B- R	W- G		W- G			B			B- W
L						L	L				B- O
2	HEATERA/F Relay	2	2	RelayEFI	2	2		C/OPNRelay		2	2
1		3	2		2	3			3		2
2		5	1		1	5			5		1
							B
2		2	2		2	2			W-B	2	2
G-W		W	B-W				B				-GRB
							E 6
								B
											GR- B
	C1	IC4			W- B		C3	IC4		C15	IC4
							B	B			GR- B
		W			2J	Junction Connector
				B	B
					B						GR- B
					W- B						B
	4	IM1									B
											W
											W- G
					EB

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2003 4RUNNER (EWD514U)

W- G

L

B- R

B- O

B- W

	B- W
2	2

FUEL PUMP	2	3
		4
	Relay	5
	1

	2	2	2
	Y- B	B- Y	B- R
			I 1
D5	IC4		B- R
	Y- B		2
			F 8 Fuel Pump Resistor
19	IM2		1
	Y- B

GR- B

B

B

W

W- G

B- R

			5	IM1
		B- R	B- R
	6	1D	3	1H
4J Junction Connector	B- O
	C		10A
			IGN
	C
	B- O
	23	1E	11	1J
	B- O		B- O
B- R

	R-B		J8(A)	Junction Connector	B	A
2	IB1				B	A
	4		Pump
	M				B- O
	5	F14	Fuel
	W- B

	A	B	A	B
J40(A), J41(B)	JunctionConnectorA	A
	W- B			W- B

BO

BL

B- R

1P Park/Neutral SWPosition

6

RelaySTA

P

N

9

G-W

P

B- Y

B- Y

Junction Connector

L

D

A

A

J28

D

C4

IC4

C17

IC4

D

A

L

W- G

P

P

B- Y

3 E

8

E

9

B

16

A

17

A

BATT

MREL

STAR

NSW

STA

E 4(A), E 5(B), E 6(C), E 7(D), E 8(E)

Engine Control Module

IGSW

FPR

FC

ACCR

+B

+B1

CCV

9 E 33 A 10 E 14 A

1 E

2 E

27 A

B- O

Y- B

GR- B

W- G

B

B

R- G

,J32(B)J31(A)

Junction Connector

B B

G-W

,J32(B)J31(A)

Junction

Connector

A B

A

B

G-R

5

17

IM2

IM2

B A

C A

C A

B- O

B

B

16

IC3

C3

IE1

ClosedValve)

G-W

R- G

1

2

V10

VSV (Canister

B

1

IB2

B

W

B

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2003 4RUNNER (EWD514U)