Lexus SC300 / Lexus SC400. Manual — part 852
PARTS LOCATION
–
ENGINE TROUBLESHOOTING
Parts location
TR–31
WIRING DIAGRAM
TR–32
–
ENGINE TROUBLESHOOTING
Wiring Diagram
–
ENGINE TROUBLESHOOTING
Wiring Diagram
TR–33
STANDARD VALUE OF ECU TERMINALS
Symbols (Terminals No.)
STD Voltage (V)
Condition
BATT (A33) – E1 (B69)
10 ~ 14
Always
IGSW (A1)
IGSW (A1)
+ B (A31) – E1 (B69)
10 ~ 14
IG switch ON
+ B (A31)
+ B1 (A32)
E1 (B69)
10 14
IG switch ON
VC (B41)–E2 (B65)
4.0 ~ 6.0
IG switch ON
Below 1 0
IG switch ON
IDL1 (B64)
E2 (B65)
Below 1.0
IG switch ON
Main or sub throttle valve fully closed.
IDL1 (B64)
IDL2 (B63)
– E2 (B65)
10
14
IG switch ON
(
)
10 ~ 14
IG switch ON
Main or sub throttle valve fully open.
0 1
1 0
IG switch ON
VTA1 (B43)
E2 (B65)
0.1 ~ 1.0
IG switch ON
Throttle valve fully closed.
VTA1 (B43)
VTA2 (B42)
– E2 (B65)
3 0
6 0
IG switch ON
(
)
3.0 ~ 6.0
IG switch ON
Throttle valve fully open.
KS (B66) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
THA (B45) – E2 (B65)
1.0 ~ 3.0
Idling, Intake air temp. 20
°
C (68
°
F).
THW (B44) – E2 (B65)
0.1 ~ 1.0
Idling, Water temp. 80
°
C (176
°
F).
STA (B77) – E1 (B69)
6.0 or more
Cranking
#10 (B20), #20 (B19)
E01 (B80)
10 ~ 14
IG switch ON
#10 (B20), #20 (B19)
#30 (B18), #40 (B17)
– E01 (B80)
Pulse generation
Idling
IGT1 (B57), IGT2 (B56) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
Below 1.0
IG switch ON
IGF1 (B58), IGF2 (B59) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
G1 (B26), G2 (B25) – G1
(B6)
Pulse generation
(–1.0 ~ +1.0 or higher)
Idling
NE (B27) – NE
(B7)
Pulse generation
(–0.8 ~ +0.8 or higher)
Idling
MREL (A24) – E1 (B69)
10 ~ 14
IG switch ON
4.2 ~ 6.0
Cranking, Sudden racing (6,000 rpm)
FPC (A22) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
DI (A21) – E1 (B69)
7.5 or more
Idling
FPU (B73)
E1 (B69)
10 ~ 14
IG switch ON
FPU (B73) – E1 (B69)
Below 2.0
Restarting high temp.
PAG (B74) – E1 (B69)
10 ~ 14
Idling
–
ENGINE TROUBLESHOOTING
Standard Value of ECU Terminals
TR–33
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