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4B
FUEL SYSTEM
COMPONENT DESCRIPTIONS
Component
Air flow meter
Detects amount of intake air;
sends signal to control unit
Atmospheric pres
Detects atmospheric pressure; sends sig
sure sensor
nal to control unit
Voltage for fuel pump while engine running
Circuit opening relay
Detects in-gear condition;
Clutch switch
sends signal to control unit
Detects N or P range; sends signal to
EC-AT control unit
control unit
Detects signals from input sensors and
Engine control unit
switches; controls injector operation
Filters particles from fuel
Fuel filter
Fuel pump
Provides fuel to injectors
Detects No.1 and No.4 cylinders TDC;
G rotor and pick-up
sends signal to control unit
Idle switch
Detects when throttle valve fully closed;
sends signal to control unit
Sends engine cranking signal to control
Ignition switch
unit
(ST position)
Inhibitor switch
Detects in-gear condition; sends signal to
EC-AT control unit
Injects fuel into intake port
Injector
Detects intake air temperature;
Intake air thermo
sends signal to control unit
sensor
Main relay
Supplies electric current to injectors and
control unit
Ne rotor and pick-up
Detects crank angle at 30° intervals;
sends signal to control unit
Detects in-gear condition; sends signal to
Neutral switch
control unit
Detects Oxygen concentration; sends sig
Oxygen sensor
nal to control unit
Pressure regulator
Adjusts fuel pressure supplied to injectors
Absorbs fuel pulsation
Pulsation damper
Detects throttle valve opening angle;
Throttle sensor
sends signal to control unit
Water thermo sensor
Detects coolant temperature;
sends signal to control unit
Water thermo switch
Detects radiator coolant temperature;
sends signal to control unit
4B-58
Function
Intake air temp sensor and
fuel pump switch are in
tegrated
Switch ON when clutch pedal
depressed
• Operates while engine
• Installed in fuel tank
For determining fuel injection
timing and ignition timing
Installed on throttle body
Switch ON in " N" or "P"
range
• Controlled by signals from
• High-ohmic injector
Installed in air flow meter
Engine speed signal
Switch ON when in-gear
Zirconia ceramic and plati
num coating
Installed on throttle body
ON: above 17°C (63°F)
Remarks
running
control unit
Application
New
Previous
model
model
O
O
O
o
o
o
o
o
o
X
o
o
o
o
o
o
o
X
0
o
o
o
o
0
o
0
o
o
o
o
o
X
o
o
o
o
o
o
o
o
o
o
o
o
0
o
86U04B-062
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Table of Contents
Troubleshooting
