Lexus SC300 / Lexus SC400. Manual — part 627
TERMINALS OF ENGINE & ECT ECU (Cont’d)
Terminal
No.
Symbol
Connection
Terminal
No.
Symbol
Connection
E10– 21
NCO
T/M Input Speed Sensor
E10 – 51
–
22
–
52
HTL2
LH Sub–Oxygen Sensor Heater
23
SP2
No.2 Speed Sensor for ECT
53
HTR2
RH Sub–Oxygen Sensor Heater
24
–
54
–
25
G2
LH (No.2) Cam Position Sensor
55
–
26
G1
RH (No.1) Cam Position Sensor
56
IGT2
No.2 Igniter for RH Bank
27
NE
Engine Speed Sensor
57
IGT1
No.1 Igniter for LH Bank
28
VF2
Check Connector
58
IGF1
No.1 Igniter for LH Bank
29
VF1
Check Connector
59
IGF2
No.2 Igniter for RH Bank
30
–
60
–
31
–
61
–
32
ISC4
ISC Valve
62
–
33
ISC3
ISC Valve
63
IDL2
Sub–Throttle Position Sensor
34
ISC2
ISC Valve
64
IDL1
Throttle Position Sensor
35
ISC1
ISC Valve
65
E2
Sensor Ground
36
*
EGR4
EGR Valve
66
KS
Air Flow Meter
37
*
EGR3
EGR Valve
67
OXR2
38
*
EGR2
EGR Valve
68
OXL2
LH Sub–Oxygen Sensor
39
*
EGR1
EGR Valve
69
E1
ECU Ground
39
*
EGR
VSV for EGR
69
E1
ECU Ground
40
–
70
–
41
VC
Throttle Position Sensor
Air Flow Meter
71
HTL1
LH Main Oxygen Sensor
42
VTA2
Fuel Pump ECU
72
HTR1
RH Main Oxygen Sensor
43
VTA1
A/C Magnet Clutch Relay
73
FPU
VSV for Fuel Pressure Control
Value
44
THW
Water Temp. Sensor
74
*
PAG
VSV for EVAP
45
THA
Intake Air Temp. Sensor
75
–
46
THG
EGR Gas Temp. Sensor
76
NSW
Neutral Start Switch
47
OXR1
RH Main Oxygen Sensor
77
STA
Starter Relay
48
OXL1
LH Main Oxygen Sensor
78
STJ
Cold Start Injector
49
KNK2
RH (No.2) Knock Sensor
79
E02
Power Ground
50
KNK1
LH (No.1) Knock Sensor
80
E01
Power Ground
Engine & ECT ECU Terminals
*
USA spec. only
*
A/T only
FI–127
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
COMPONENTS FOR REMOVAL AND
INSTALLATION
INSPECTION OF ENGINE & ECT ECU
1.
DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ”LOCK” position and the negative (–) termi-
nal cable is disconnected from the battery.
2. DISCONNECT
ENGINE & ECT ECU FROM FLOOR PANEL
(a) Remove the two clips, and pull out the instrument panel
under cover.
FI–128
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
(b) Take out the front side of the floor carpet.
(c) Remove the two nuts and protector.
(d) Remove
the nut, and disconnect the engine & ECT ECU
from the floor panel.
3.
INSPECT ENGINE & ECT ECU
A.
Install SST (check harness) between engine & ECT ECU
and wiring connectors
HINT:
•
ECU connectors are water–proof and are the bolt type.
•
For water–proof type connectors, in order to measure
the voltage of ECU terminals and the resistance of
connected parts, connect a check harness (SST
09990–01000) between the ECU and wiring
connectors, then perform the inspection.
•
Avoid inserting a tester probe from the other side of
connector as this noticeably reduces the water–proof
ability.
•
Disconnect the ECU connectors by fully loosening the
bolt.
(a) Remove the bolt, and disconnect the two ECU
connectors.
NOTICE:
•
Do not pull the wiring harness when disconnecting the
connectors.
•
When disconnecting the connector, the ECU’s back–up
power source is cut off, so the malfunction codes, etc.
recorded in the ECU memory are cancelled.
•
Never insert a tester probe or male terminal used for
inspection purposes into the female terminal of the
vehicle wire harness. Otherwise, the female terminal may
be widened, which can reselt in faulty connection.
(b) Connect SST (check harness) between ECU and wiring
connectors.
SST 09990–01000
HINT: SST (check harness) connector terminals are ar-
ranged the same as those of the ECU.
FI–129
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
B.
Inspect voltage of engine & ECT ECU
Check the voltage between each terminal.
•
Turn the ignition switch ON.
•
Measure the voltage at each terminal.
HINT:
•
Perform all voltage measurements with the connectors
connected.
•
Verify that the battery voltage is 11 V or more when the
ignition switch is ON.
FI–130
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
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