Lexus SC300 / Lexus SC400. Manual — part 977

72

ENGINE CONTROL

VC

VTA

IDL

E2

2

1

3

4

1

2

3

4

E20

E18

E18

B

42

VTA2

B

63

IDL2

B

65

E2

B

64

IDL1

B

43

VTA1

B

41

VC

B

45

THA

B

66

KS

A

35

PS

B

47

OX2

5

THA

KS

VC

E2

BR

BR

B–R

B–R

W

G

B

L–Y

B–R

BR

BR

BR

BR

BR

R

Y

L–R

BR

Y–

B

Y–

G

L–

R

BR

R

Y

L–R

BR

R–

B

Y–

L

E

THROTTLE
POSITION
SENSOR

AIR FLOW METER

ENGINE ECU (M/T)

TO

S

U

B

T

H

R

O

T

TL

E

P

O

SI

T

IO

N

SE

N

S

O

R

(W

/

TR

A

C

TI

O

N

C

O

NT

RO

L

)

E11

, E12

A

B

T 2

A 9

ENGINE AND ECT ECU (A/T)

E 9

, E1 0

A

B

(FOR USA SPEC. )

1

2

I34

I40

I17

I23

I32

B17

E16

I13

I34

I32

IK1

1

BY1

6

BY1

5

IG3

3

IK2

22

IK2

12

BY1

2

BY1

1

1

1

B

48

OX1

B

71

HT

B

61

OX3

EC

BT1

17

LG

–B

W

BR

W

BR

–

W

BR

–

W

W

BR

–

W

W

R–

L

R–

L

R–

L

B–

R

BR

B–R

(SH

IEL

D

E

D

)

(SH

IEL

D

E

D

)

(SHIELDED)

W

BR–W

R–B

BR

BR

BR

R–L

G

B

L–Y

B–R

BR

BR

BR

BR

(SH

IE

L

D

E

D

)

G

B

L–Y

B–R

BR

BR

B–R

BR

R–L

BR–W

BR

O

XYG

E

N

SE

N

S

O

R

SU

B

(F

O

R

U

S

A

SPE

C

.

)

O8

4

2

1

3

(*2)

(*1

)

(*2

)

(*1

)

(*3

)

O3

O

X

Y

G

EN

SE

N

SO

R

MA

IN

N

O

.

1

(ON

F

R

ON

T

S

ID

E

)

PO

W

ER

S

T

E

R

R

IN

G

PR

ES

SU

R

E

S

W

P2

0

O4

O

X

YG

E

N

SE

N

N

SO

R

MA

IN

N

O

.

2

(O

N

RE

A

R

S

IDE

)

(SHIELDED)

(*3

)

R–L

B–R

B–R

BR

BR

(*2

)

(*1

)

BR

(SHIELDED)

73

* 1 : W/ CD PLAYER

* 3 : FOR USA SPEC.

* 2 : W/O CD PLAYER

8

13

7

1

5

2

3

4

1

19

12

8

3

E20

I32

I32

IJ1

1

IK1

3

IK1

4

IK1

5

IK1

2

EB1

2

II1

5

B

4

E11

B

69

E1

B

28

VF2

B

29

VF1

A

20

TE1

A

3

KD

A

17

TT

A

23

ACMG

A

34

A/C

IF

ED

BR

W

G

B

L–Y

B–R

BR

B–R

B–R

B–R

LG

GR–Y

W

L–

O

L–R

W

GR

–

Y

LG

GR

–

Y

LG

B–

Y

BR

GR

–

Y

LG

G–

R

G–

Y

G–

R

L

BR

L–Y

B–

R

B

G

W

BR

W

E1

+B

IG–

FP

OX

E1

OX2

TE1

VF1

ENG

TE1

TT

TE2

E11

, E1 2

T 6

C 3

FROM A/C MAGNETIC
CLUTCH RELAY

FROM A/C CONTROL
ASSEMBLY

ENGINE ECU (M/T)

CHECK CONNECTOR

TDCL
(TOTAL DIAGNOSTIC

COMMUNICATION LINK)

A

B

IJ1

12

R–L

I33

I32

BR

15

VF2

14

BR

BR

EC

E 9

, E 10

ENGINE AND ECT ECU (A/T)

A

B

IH1

2

IJ2

17

1

2

IH1

1

A

19

TE2

G–

Y

W–

B

W–

B

L

L

(SHIELDED)

(SHIELDED)

B–

R

BR

B–

R

(SH

IEL

D

ED

)

KICK DOWN
SW

K 3

BR

74

ENGINE CONTROL

EFI MAIN RELAY

2 – 4: CLOSED WITH IGNITION SW AT ON OR ST POSITION

W 4

WATER TEMP. SENSOR

1 – 2: APPROX. 16.2K

(–20

°

C, –4

°

F)

: APPROX. 2.45K

(20

°

C, 68

°

F)

: APPROX. 0.32K

(80

°

C, 176

°

F)

E 3

EGR GAS TEMP. SENSOR (FOR USA SPEC.)

1 – 2: APPROX. 78.30K

(50

°

C, 122

°

F)

APPROX. 13.06K

(100

°

C, 212

°

F)

APPROX. 3.16K

(150

°

C, 302

°

F)

E 9(A), E10(B)

ENGINE AND ECT ECU,

E11(A), E12(B)

ENGINE ECU

(VOLTAGE AT ENGINE AND ECT ECU WIRING CONNECTORS)

BATT – E1 : ALWAYS APPROX. 12 VOLTS

IGSW – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON

+B, +B1 – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON

VC – E2 : 4–6 VOLTS WITH IGNITION SW ON

IDL1, IDL2 – E2 : 0–1 VOLTS WITH IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED

: 10–14 VOLTS WITH IGNITION SW ON AND THROTTLE VALVE FULLY OPEN

VTA1, VTA2 – E2 : 0.1–1.0 VOLTS WITH IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED

: 3–6 VOLTS WITH IGNITION SW ON AND THROTTLE VALVE FULLY OPEN

THA – E2 : 1–3 VOLTS WITH IGNITION SW ON AND INTAKE AIR TEMP. 20

°

C (68

°

F)

THW – E2 : 0.1–1.0 VOLTS WITH IGNITION SW ON AND COOLANT TEMP. 80

°

C (176

°

F)

STA – E1 : 6–14 VOLTS WITH ENGINE CRANKING

#10, #20, #30, #40, #50, #60 – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON

IGF – E1 : 0–1 VOLTS WITH ENGINE IDLING

MREL – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON

DI – E1 : 7.5–14 VOLTS WITH ENGINE IDLING

ISC1, ISC2, ISC3, ISC4 – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON

HTL1, HTR1, HTL2, HTR2 – E01: 0–2 VOLTS WITH ENGINE IDLING

EGR – E1 : APPROX. 12 VOLTS WITH ENGINE IDLING

NSW – E1 : 0–1 VOLTS WITH IGNITION SW ON AND SHIFT LEVER P OR N RANGE

: 10–14 VOLTS WITH IGNITION SW ON AND SHIFT EXCEPT P OR N RANGE

TE1 – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON
TE2 – E2 : APPROX. 12 VOLTS WITH IGNITION SW ON

W – E1 : APPROX. 12 VOLTS WITH ENGINE IDLING

0–2 VOLTS WITH IGNITION SW ON

A/C – E1 : 0–2 VOLTS WITH AIR CONDITIONER ON

10–14 VOLTS WITH AIR CONDITIONER OFF

ACMG – E1 : 0–2 VOLTS WITH AIR CONDITIONER ON

: 10–14 VOLTS WITH AIR CONDITIONER OFF

TR – E1 : APPROX. 12 VOLTS WITH IGNITION SW ON

VTA1, VTA2 – E2 : 0–1 VOLTS WITH IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED

3–5.5 VOLTS WITH IGNITION SW ON AND THROTTLE VALVE FULLY OPEN

NE – E1 : 4–6 VOLTS WITH IGNITION SW ON

(RESISTANCE OF ENGINE AND ECT ECU WIRING CONNECTORS)
+B, +B1 – #10, #20, #30, #40, #50, #60 : 13.2–14.2

+B, +B1, ISC1, ISC2, ISC3, ISC4

: 10–30

+B, +B1 –EGR: 33–39

+B, +B1, HT : 5.1–6.3

+B, +B1 –EVAP : 30–34

IDL1, IDL2 E2 :

INFINITY WITH THROTTLE VALVE OPEN
0–0.5

WITH THROTTLE VALVE FULLY CLOSED

VTA1, VTA2 E2 :

2.4–10.7

WITH THROTTLE VALVE FULLY OPEN

0.3–5.9

WITH THROTTLE VALVE FULLY CLOSED

VCC – E2 : 3–7K

THW – E2 : 200–400

WITH COOLANT TEMP. 80

°

C (176

°

F)

THA – E2 : 2–3K

WITH INTAKE AIR TEMP. 20

°

C (68

°

F)

THG – E2 : 69.4–88.5K

WITH EGR GAS TEMP. 50

°

C (112

°

F)

G1, G2 –G– : 0.835–13.5K

NE– G–

: 0.835–13.5K

SERVICE HINTS

75

I 1

ISC VALVE

4, 6–5 : APPROX. 21.3

1, 3–2 : APPROX. 21.3

I 6, I 7, I 8, I 9, I10, I11

INJECTOR

1 – 2 : APPROX. 13.8

O 8

OXYGEN SENSOR SUB (FOR USA SPEC.)

1 – 2 : APPROX. 5.6

(20

°

C, 68

°

F)

T 2

THROTTLE POSITION SENSOR

1 – 4 : APPROX. 3–7K

1 – 3 : 2.4–10.7K

WITH THROTTLE VALVE FULLY OPENED POSITION

0.3–5.9K

WITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0MM (0 IN.)

1 – 2 : LESS THAN 0.5K

WITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0.4 MM (0.0157 IN.)

INFINITY WITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0.85MM (0.0335 IN.)