Lexus SC300 / Lexus SC400. Manual — part 499
SERVICE DATA (Cont’d)
Water temp.
sensor
Resistance
at –20
°
C (–4
°
F)
at 0
°
C (32
°
F)
at 20
°
C (68
°
F)
at 40
°
C (104
°
F)
at 60
°
C (140
°
F)
at 80
°
C (176
°
F)
10 – 20 k
4 – 7 k
2 – 7 k
0.9 – 1.3 k
0.4 – 0.7 k
0.2 – 0.4 k
EGR gas
temp.
sensor
Resistance
at 50
°
C (112
°
F)
at 100
°
C (212
°
F)
at 150
°
C (302
°
F)
69 – 89 k
12 – 15 k
2 – 4 k
Main oxygen
sensor
Heater coil resistance
5.1 – 6.3
Sub–oxygen
sensor
Heater coil resistance
5.1 – 6.3
ECU
HINT:
Perform all voltage and resistance measurements with the ECU connected.
Verify that the battery voltage in 11 V or above with the ignition switch is ON.
Voltage
Terminals
Condition
STD voltage (V)
BATT – E1
–
10 – 14
IGSW
+B – E1
+B1
IG SW ON
10 – 14
VC – E2
–
4.0 – 6.0
IDL1
E2
Throttle (or sub–throttle) valve fully closed
1 or less
IDL1
IDL2
– E2
IG SW ON
Throttle (or sub–throttle) valve fully open
10 – 14
VTA1
E2
Throttle (or sub–throttle) valve fully closed
0.1 or less
VTA1
VTA 2
– E2
Throttle (or sub–throttle) valve fully open
3.0 – 6.0
KS – E1
Idling
Pulse generation
THA – E2
THW – E2
Idling
Intake air temp. 20
°
C (68
°
F)
1.0 – 3.0
THW – E2
Idling
Engine coolant temp. 80
°
C (176
°
F)
0.1 – 1.0
STA – E1
Cranking
6.0 or more
#10
#20
E01
IG SW ON
10 – 14
#20
#30
#40
–
E01
E02
Idling
Pulse generation
IGT1
IGT2
– E1
Idling
Pulse generation
FI–138
EFI SYSTEM – Service Specifications
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
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