Lexus SC300 / Lexus SC400. Manual — part 628
Voltage at Engine (& ECT) ECU Wiring Connectors
Terminals
Condition
STD voltage (V)
BATT (E9 – 33) – E1 (E10 – 69)
–
10 – 14
IGSW (E9 – 1)
+B (E9 – 31) – E1 (E10 – 69)
IG SW ON
10 – 14
+B1 (E9 – 32)
VC (E10 – 41) – E2 (E10 – 65)
–
4.0 – 6.0
IDL1 (E10 – 64)
E2 (E10
65)
Throttle (or sub–throttle) valve fully closed
1.0 or less
IDL2 (E10 – 63)
– E2 (E10 – 65)
IG SW ON
Throttle (or sub–throttle) valve fully open
10 – 14
VTA1 (E10 – 43)
E2 (E10
65)
Throttle (or sub–throttle) valve fully closed
0.1 – 1.0
VTA1 (E10 – 42)
– E2 (E10 – 65)
Throttle (or sub–throttle) valve fully open
3.0 – 6.0
KS (E10 – 66)
– E1 (E10 – 69)
Idling
Pulse generation
THA (E10 – 45)
– E2 (E10 – 65)
Idling
Intake air temp. 20
°
C (68
°
F)
1.0 – 3.0
THW (E10 – 44)
– E2 (E10 – 65)
Idling
Engine Coolant temp. 80
°
C (176
°
F)
0.1 – 1.0
STA (E10 – 77)
– E1 (E10 – 69)
Cranking
6.0 or more
#10 (E10 – 20)
#20 (E10 – 19)
E01 (E10 – 80)
IG SW ON
10 – 14
#30 (E10 – 18)
–
E02 (E10 – 79)
#40 (E10 – 17)
Idling
Pulse generation
IGT1 (E10 – 57)
E1 (E10
69)
Idling
Pulse generation
IGT2 (E10 – 56)
– E1 (E10 – 69)
Idling
Pulse generation
IGF1 (E10 – 58)
E1 (E10
69)
Idling
Pulse generation
IGF2 (E10 – 59)
– E1 (E10 – 69)
Idling
Pulse generation
G1 (E10 – 26)
G1
– (E10–6)
Idling
Pulse generation
G2 (E10 – 25)
–
G2
– (E10–5)
Idling
Pulse generation
NE (E10 – 27)
– G – (E10 – 7)
Idling
Pulse generation
M – REL (E9 – 24)
– E1 (E10 – 69)
IG SW ON
10 – 14
FPC (E9
22)
E1 (E10
69)
Cranking, Sudden racing (6,000 rpm)
4.2 – 6.0
FPC (E9 – 22)
– E1 (E10 – 69)
Idling
Pulse generation
D1 (E9 – 21)
– E1 (E10 – 69)
Idling
7.5 or more
FPU (E10
73)
E1 (E10
69)
IG SW ON
10 – 14
FPU (E10 – 73)
– E1 (E10 – 69)
Restarting high temp.
2.0 or less
PAG (E10 – 74)
– E01 (E10 – 69)
IG SW ON
10 – 14
Engine & ECT ECU Terminals
FI–131
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
Voltage at Engine (& ECT) ECU Wiring Connectors (Cont’d)
Terminals
Condition
STD voltage (V)
ISC1 (E10 – 35)
ISC2 (E10 – 34)
E1 (E10
69)
IG SW ON
10
14
ISC3 (E10 – 33)
– E1 (E10 – 69)
IG SW ON
10 – 14
ISC4 (E10 – 32)
VF1 (E10 – 29)
E1 (E10
69)
Maintain engine speed at 2,500 rpm for 120 seconds
1 0
4 0
VF2 (E10 – 28)
– E1 (E10 – 69)
Maintain engine s eed at 2,500 r m for 120 seconds
after warming up then return to idling
1.0 – 4.0
OX1 (E10 – 48)
E1 (E10
69)
Maintain engine speed at 2,500 rpm for 120 seconds
Pulse generation
OX2 (E10 – 47)
– E1 (E10 – 69)
Maintain engine s eed at 2,500 r m for 120 seconds
after warming up
Pulse generation
(0 – 1.0)
HT (E10 – 71)
– E01 (E10 – 80)
Idle
2.0 or less
KNK1 (E10 – 50)
E1 (E10
69)
Idle
Pulse generation
KNK2 (E10 – 49)
– E1 (E10 – 69)
Idle
Pulse generation
NSW (E10
76)
E1 (E10
69)
IG SW ON
Shift position “P” or “N” range
1.0 or less
NSW (E10 – 76)
– E1 (E10 – 69)
IG SW ON
Ex. shift position “P” or “N” range
10 – 14
SP1 (E9 – 2)
– E1 (E10 – 69)
IG SW ON
Rotate driving wheel slowly.
4 or more
TE1 (E9 – 20)
E1 (E10
69)
IG SW ON
10
14
TE2 (E9 – 19)
– E1 (E10 – 69)
IG SW ON
10 – 14
W (E9
6)
E1 (E10
69)
IG SW ON
2.0 or less
W (E9 – 6)
– E1 (E10 – 69)
Idle
10 – 14
OD1 (E9 – 12)
– E1 (E10 – 69)
IG SW ON
4.0 – 6.0
A/C (E9
34)
E1 (E10
69)
A/C SW ON (at idle)
2.0 or less
A/C (E9 – 34)
– E1 (E10 – 69)
A/C SW OFF
10 – 14
ACMG (E9
23)
E1 (E10
69)
A/C SW ON (at idle)
2.0 or less
ACMG (E9 – 23)
– E1 (E10 – 69)
A/C SW OFF
10 – 14
TR (E9 – 37)
– E1 (E10 – 69)
IG SW ON
10 – 14
VT01 (E9 – 40)
E2 (E10
65)
IG SW ON
Throttle (or sub–throttle) valve fully closed
1.0 or less
VT02 (E9 – 39)
– E2 (E10 – 65)
IG SW ON
Throttle (or sub–throttle) valve fully open
3.0 – 5.5
NEO (E9 – 38)
– E1 – (E10 – 69) IG SW ON
4.0 – 6.0
Engine & ECT ECU Terminals
FI–132
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
B.
Inspect resistance of engine & ECT ECU wiring connectors
NOTICE: Do not touch the ECU terminals.
Check the resistance between each terminal of the wiring
connectors.
•
Disconnect the SST (check harness) connectors
from the ECU.
•
Measure the resistance at each terminal.
FI–133
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
Resistance of ECU Wiring Connectors
Terminals
Condition
STD voltage (V)
#10 (E10 – 20)
#20 (E10 – 19)
#30 (E10 – 18)
+ B (E9 – 31)
13 2
14 2
#40 (E10 – 17)
–
+ B1 (E9 – 32)
–
13.2 – 14.2
#50 (E10 – 16)
#60 (E10 – 15)
ISC1 (E10 – 35)
ISC2 (E10 – 34)
+ B (E9 – 31)
10
30
ISC3 (E10 – 33)
–
+ B1 (E9 – 32)
–
10 – 30
ISC4 (E10 – 32)
ACIS (E10
39)
+ B (E9 – 31)
38 5
44 5
ACIS (E10 – 39)
–
+ B1 (E9 – 32)
–
38.5 – 44.5
HT (E10
71)
+ B (E9 – 31)
5 1
6 3
HT (E10 – 71)
–
+ B1 (E9 – 32)
–
5.1 – 6.3
EVAP (E10
74)
+ B (E9 – 31)
30
34
EVAP (E10 – 74)
–
+ B1 (E9 – 32)
–
30 – 34
ERG (E10
75)
+ B (E9 – 31)
33
39
ERG (E10 – 75)
–
+ B1 (E9 – 32)
–
33 – 39
IDL1 (E10 – 64)
E2
(E10
65)
Throttle valve open
Infinity
IDL2 (E10 – 63)
– E2 – (E10 – 65)
Throttle valve fully closed
2,300 or less
VTA1 (E10 – 43)
E2
(E10
65)
Throttle valve open
3,300 – 10,000
VTA2 (E10 – 42)
– E2 – (E10 – 65)
Throttle valve fully closed
200 – 800
VC (E10 – 41)
– E2 – (E10 – 65)
–
4,000 – 9,000
THA (E10 – 45)
– E2 – (E10 – 65) Intake air temp. 20
°
C (68
°
F)
2,000 – 3,000
THW (E10 – 44)
– E2 – (E10 – 65) Coolant temp. 80
°
C (176
°
F)
200 – 400
THG (E10 – 46)
– E2 – (E10 – 65) EGR gas temp. 50
°
C (112
°
F)
69,400 – 88,500
G1 (E10 – 26)
G (E10
7)
Cam position sensor
10
+ 40
°
C (14
104
°
F)
125
190
G2 (E10 – 25)
– G (E10 – 7)
Cam position sensor – 10 – + 40
°
C (14 – 104
°
F)
125 – 190
NE (E10 – 27)
– G (E10 – 7)
Cam position sensor – 10 – + 40
°
C (14 – 104
°
F)
155 – 240
Engine & ECT ECU Terminals
FI–134
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
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