Lexus SC300 / Lexus SC400. Manual — part 626
INSPECTION OF FUEL PUMP 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.
REMOVE SEAT CUSHION AND BACK
3.
REMOVE QUARTER TRIM
(a) Disconnect the rear side of the scuff plate by pulling it.
(b) Remove clip A.
(c) Remove the belt hole cover by pulling it.
(d) Remove clip B.
(e) Remove the quarter trim by pulling it.
4.
DISCONNECT FUEL PUMP ECU CONNECTOR
FI–123
EFI SYSTEM – Electronic Control System (Fuel Pump ECU)
5.
INSPECT FUEL PUMP ECU
(a) Connect the cable to the negative (–) terminal of the
battery.
(b) Check the connector on the wiring harness side as
shown in the chart.
Check for
Tester connection
Condition
Specified value
Continuity
E – Ground
–
Continuity
Continuity
DI – Ground
–
Continuity
Voltage
FP
Ground
Sudden racing
12 – 14 V
Voltage
FP – Ground
Idling
8 – 10 V
Voltage
+ B – Ground
IG SW ON
10 – 14 V
Voltage
FPC – Ground
Sudden racing
(1,600 rpm or more)
4 – 6 V
Voltage
FPC Ground
Idling
2.5 V
If circuit is as specified, replace the fuel pump ECU.
(c) Disconnect the cable from the negative (–) terminal of
the battery.
6.
RECONNECT FUEL PUMP ECU CONNECTOR
7.
INSTALL QUARTER TRIM
(a) Attach the upper side of the quarter trim to the quarter
panel.
(b) Install the quarter trim with the four clips.
FI–124
EFI SYSTEM – Electronic Control System (Fuel Pump ECU)
(c) Install the belt hole cover with the two clips.
(d) Install the rear side of the scuff.
8.
REINSTALL SEAT BACK AND CUSHION
9.
RECONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
FI–125
EFI SYSTEM – Electronic Control System (Fuel Pump ECU)
Engine & ECT ECU
TERMINALS OF ENGINE & ECT ECU
Terminal
No.
Symbol
Connection
Terminal
No.
Symbol
Connection
E9 – 1
IGSW
Ignition Switch
E9 – 31
+ B EFI Main Relay
2
SPD
No. 1 Speed Sensor
32
+ B1 EFI Main Relay
3
KD
Kick–Down Switch
33
BATT Battery
4
STP
Stop light Switch
34
A/C A/C Control Assembly
5
–
35
–
6
W
“CHECK” Engine Warning Light
36
–
7
R
Neutral Start Switch
37
TR TRAC ECU
8
–
38
NEO TRAC ECU
9
2
Neutral Start Switch
39
VTO2 TRAC ECU
10
L
Neutral Start Switch
40
VTO1 TRAC ECU
11
AD
CC ECU
E10 – 1
NCO
T/M Input Speed Sensor
12
OD1
CC ECU
2
–
13
–
3
SP2
No. 2 Speed Sensor for ECT
14
–
4
E11 ECU Ground
15
–
5
G2
Cam position Sensor
16
–
6
G1
Cam position Sensor
17
TT
TDCL
7
NF
Engine Speed Sensor
18
P
ECT Pattern Select Switch
8
–
19
TE2
Check Connector
9
S2 ECT Solenoid Value
20
TE1
Check Connector
10
S1 ECT Solenoid Value
21
D1
Fuel Pump ECU
11
–
22
FPC
Fuel Pump ECU
12
–
23
ACMG
A/C Magnet Clutch Relay
13
SLN
No.3 ECT Solenoid Valve
24
M–REL
EFI Main Relay
14
SLU
No.4 ECT Solenoid Valve
25
–
15
–
26
–
16
–
27
–
17
#10 No.3 and No.5 Injectors
28
OD2
O/D Main Relay
18
#20 No.4 and No.6 Injectors
29
–
19
#20 No.2 and No.8 Injectors
30
–
20
#40 No.1 and No.7 Injectors
Engine & ECT ECU Terminals
FI–126
– Electronic Control System (Engine & ECT ECU)
EFI SYSTEM
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