1991 LEXUS SC400 Service Repair Manual

Page 2009 of 4087

LEXUS SC400 1991  Service Repair Manual 
OPERATION
FI±5                        ±   OperationEFI SYSTEM 
WhereEverybodyKnowsYourName

Page 2010 of 4087

LEXUS SC400 1991  Service Repair Manual 
FI±6EFI SYSTEM   ±   Operation 
WhereEverybodyKnowsYourName

Page 2011 of 4087

LEXUS SC400 1991  Service Repair Manual 
FUEL SYSTEM
Fuel is pumped up by the fuel pump, which flows through the fuel filter under pr\
essure through the fuel pipe
to the delivery pipe where it is distributed to each injector and the cold\

Page 2012 of 4087

LEXUS SC400 1991  Service Repair Manual 
AIR INDUCTION SYSTEM
Air filtered through the air cleaner passes through the air flow meter and \
the amount flowing to the air intake
chamber is determined according to the throttle valve opening in

Page 2013 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 2014 of 4087

LEXUS SC400 1991  Service Repair Manual 
PREPARATION
SST (SPECIAL SERVICE TOOLS)
IllustrationPart No.Part NameNote
09268±41045Injection Measuring
Tool Set
(09268±41090)(No. 7 Union)
Injector
(09268±52010)(Injection Measuring
Attachment)

Page 2015 of 4087

LEXUS SC400 1991  Service Repair Manual 
RECOMMENDED TOOLS
IllustrationPart No.Part NameNote
09082±00015TOYOTA
Electrical Tester
09200±00010Engine Adjust
Kit
09258±00030Hose Plug Set
Plug for the vacuum hose, fuel hose, etc.
EQUIPMENT
Pa

Page 2016 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