1991 LEXUS SC400 Service Repair Manual

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Page 2393 of 4087

$LEXUS SC400 1991 Service Repair Manual ELECTRONIC CONTROL SYSTEM The control system consists of sensors which detect various engine conditions, and a ECU which deter\ - mines the injection volume (timing) based on the signals from the sen$

Page 2394 of 4087

LEXUS SC400 1991 Service Repair Manual
Preparation
SST (SPECIAL SERVICE TOOLS)
IllustrationPart No.Part NameNote
09268±41045Injection Measuring
Tool Set
(90268±41070)No. 4 Union
Injector
(09268±41080)No. 6 Union
Cold start Injector
(09

Page 2395 of 4087

LEXUS SC400 1991 Service Repair Manual
RECOMMENDED TOOLS
IllustrationPart No.Part NameNote
09082±0015TOYOTA
Electrical Tester
09200±00010Engine Adjust
Kit
09258±00030Hose Plug Set
Plug for the Vacuum hose, fuel hose ect.
EQUIPMENT
Part

Page 2396 of 4087

LEXUS SC400 1991 Service Repair Manual
PRECAUTIONS
1. Before working on the fuel system, disconnect the cablefrom negative (±) terminal of the battery.
HINT: Any diagnostic code retained by the computer will be
erased when the battery t

Page 2397 of 4087

LEXUS SC400 1991 Service Repair Manual
FUEL SYSTEM
Fuel Pump
ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION(a) Using SST, connect terminals +B and FP of the check
(ºDIAGNOSISº) connector.
SST 09843±18020
(b) Turn the ignition s

Page 2398 of 4087

LEXUS SC400 1991 Service Repair Manual
If there is no pressure, check the following parts:w Fuses
w EFI main relay
w Fuel pump ECU
w Fuel pump
w Engine & ECT ECU
w Wiring connections
2. CHECK FUEL PRESSURE (a) Check the battery voltage

Page 2399 of 4087

LEXUS SC400 1991 Service Repair Manual
(j) Turn the ignition switch ON.
(k) Measure the fuel pressure.
Fuel pressure: 265±304 kPa(2.7±3.1 kgf/cm
2, 38±44 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is l

Page 2400 of 4087

LEXUS SC400 1991 Service Repair Manual
COMPONENTS FOR REMOVAL AND
INSTALLATION
FI±20EFI SYSTEM ± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

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