Lexus SC300 / Lexus SC400. Service manual — part 630

SERVICE DATA (Cont’d)

ECU (cont’d)

Voltage (cont’d)

Terminals

Condition

STD voltage (V)

IGF1

E1

IG SW ON

1.0 or less

IGF1
IGF2

– E1

Idling

Pulse generation

G1
G2

G1 (–)
G2 (–)

–

Idling

Pulse generation

NE – NE (+)

Idling

Pulse generation

M–REL – E1

IG SW ON

10 – 14

FPC

E1

Cracking, Sudden racing (6,000 rpm)

4.2 – 6.0

FPC – E1

Idling

Pulse generation

DI – E1

Idling

7.5 or more

FPU

E1

IG SW ON

10 – 14

FPU – E1

Restarting high temp.

2.0 or less

PAG – E1

IG SW ON

10 – 14

ISC1
ISC2
ISC3
ISC4

– E1

IG SW ON

10 – 14

VF1
VF2

– E1

Maintain engine speed at 2,500 rpm for 120 seconds
after warming up then return to idling.

1.0 – 4.0

OXR1

OXL1

– E1

Maintain engine speed at 2,500 rpm for 120 seconds
after warming up

Pulse generation

(0 – 1.0)

HTR1
HTR2

E01

IG SW ON

10 – 14

HTR2

HTL1
HTL2

–

E01
E02

Idling

2.0 or less

EGR1
EGR2
EGR3
EGR4

– E1

IG SW ON

10 – 14

EGR – E1

Idling

10 – 14

KNK1
KNK2

– E1

Idling

Pulse generation

NSW

E1

IG SW ON

Shift position ”P” or ”N” range

1.0 or less

NSW – E1

IG SW ON

Ex. shift position ”P” or ”N” range

10 – 14

FI–139

EFI SYSTEM – Service Specifications

SERVICE DATA (Cont’d)

ECU (cont’d)

Voltage (cont’d)

Terminals

Condition

STD voltage (V)

SPD – E1

IG SW ON

Rotate driving wheel slowly.

4 or more

TE1
TE2

– E1

IG SW ON

10 – 14

W

E1

IG SW ON

2.0 or less

W – E1

Idling

10 – 14

AD – E1

Idling

10 – 14

OD1 – E1

IG SW ON

4.0 – 6.0

A/C

E1

A/C SW ON (at idling)

2.0 or less

A/C – E1

A/C SW OFF

10 – 14

ACMG

E1

A/C SW ON (at idling)

2.0 or less

ACMG – E1

A/C SW OFF

10 – 14

TR – E1

IG SW ON

10 – 14

VT01

E2

IG SW ON

Throttle (or sub–throttle) valve fully closed

1.0 or less

VT01
VT02

– E2

IG SW ON

IG SW ON Throttle (or sub–throttle) valve fully open

3.0 – 5.5

NE0 – E1

IG SW ON

4.0 – 6.0

Resistance of wiring connector side

Terminals

Condition

STD voltage (

)

–

#10
#20
#30
#40

+B
+B1

–

13.2 – 14.2

–

STJ

+B
+B1

–

2 – 4

–

ISC1
ISC2
ISC3
ISC4

+B
+B1

–

10 – 30

–

FPU

+B
+B1

–

37 – 44

–

EGR1
EGR2
EGR3
EGR4

+B
+B1

–

19.9 – 23.4

–

EGR

+B
+B1

–

33 – 39

FI–140

EFI SYSTEM – Service Specifications

SERVICE DATA (Cont’d)

ECU (cont’d)

Resistance of wiring connector side (cont’d)

Terminals

Condition

STD voltage (

)

–

HTR1
HTR2

HTL1
HTL2

+B
+B1

–

5.1 – 6.3

–

PAG

+B
+B1

–

30 – 34

–

IDL1

+B

Throttle valve fully open

Infinity

–

IDL1
IDL2

+B
+B1

Throttle valve fully closed

2,300 or less

–

VTA1

E2

Throttle valve fully open

3,300 – 10,000

–

VTA1
VTA2

E2

Throttle valve fully closed

200 – 800

VC – E2

–

4,000 – 9,000

THS – E2

Intake air temp, 20

°

C (68

°

F)

2,000 – 3,000

THW – E2

Coolant temp. 80

°

C (176

°

F)

200 – 400

THG – E2

EGR gas temp. 50

°

C (112

°

F)

69,400 – 88,500

G1
G2

G1 (–)
G2 (–)

–

Cam position sensor – 10 – +40

°

C (14 – 104

°

F)

835 – 1,350

NE – NE (–)

engine speed sensor – 10 – +40

°

C (14 – 104

°

F)

835 – 1,350

Fuel cut rpm

w/ Vehicle speed 0 km/h and coolant temp. 80

°

C (176

°

F)

Fuel cut rpm
Fuel return rpm

1,800 rpm
1,400 rpm

FI–141

EFI SYSTEM – Service Specifications

TORQUE SPECIFICATIONS

Part tightened

N

⋅

m

kgf

⋅

cm

ft

⋅

lbf

Fuel line

Union bolt type
Flare nut type

29

300

22

Fuel pipe X Delivery pipe

39

400

29

Fuel pump bracket X Fuel tank

5.4

55

48 in.

⋅

lbf

Fuel pump set plate X Fuel tank

3.9

40

35 in.

⋅

lbf

Fuel tank X Body

25

250

18

Fuel sender gauge X Fuel tank

2.9

30

26 in.

⋅

lbf

Fuel inlet pipe X Fuel tank

2.9

30

26 in.

⋅

lbf

Fuel tank main tube X Fuel tank

29

300

22

Fuel tank return tube X Fuel tank

29

300

22

Fuel tank evaporation vent tube X Fuel tank

29

300

22

Air flow meter X Air cleaner case

10

100

7

Cold start injector X Air intake chamber

7.8

80

69 in.

⋅

lbf

Cold start injector tube X Cold start injector

15

150

11

Air intake chamber X Intake manifold

18

185

13

EGR pipe X Air intake chamber

18

185

13

EGR pipe X RH cylinder head

18

185

13

Cold start injector tube X RH Delivery pipe

15

150

11

Throttle body X Air intake chamber

18

185

13

Fuel return pipe X Fuel pressure regulator

35

360

26

Fuel pressure regulator X RH delivery pipe

29

300

22

Delivery pipe X Intake manifold

18

185

13

Fuel inlet hose X LH delivery pipe

39

400

29

for SST

33

340

24

ISC valve X Air intake chamber

18

185

13

Cold start injector time switch X Front water by–pass joint

34

350

25

Water temperature sensor X Front water by–pass joint

20

200

14

Water inlet housing X Water pump

18

185

13

EGR gas temperature sensor X EGR valve adaptor

20

200

14

EGR valve adaptor X Air intake chamber

18

185

13

EGR valve X EGR valve adaptor

18

185

13

Knock sensor X Cylinder block

44

450

33

Intake manifold X Cylinder head

18

185

13

Main oxygen sensor X Exhaust manifold

44

450

33

Sub–oxygen sensor X Exhaust manifold

44

450

33

FI–142

EFI SYSTEM – Service Specifications