Lexus SC300 / Lexus SC400. Manual — part 495
Fuel pump ECU
COMPONENTS FOR REMOVAL AND
INSTALLATION
FI–122
– Electronic Control System (Fuel Pump ECU)
EFI SYSTEM
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)
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