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4A
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
Circuit opening relay
Voltage for fuel pump while engine running
Clutch switch
Detects in-gear condition;
sends signal to control unit
EC-AT control unit
Detects N or P range; sends signal to
control unit
Engine control unit
Detects signals from input sensors and
switches; controls injector operation
Fuel filter
Filters particles from fuel
Fuel pump
Provides fuel to injectors
Idle switch
Detects when throttle valve fully closed;
sends signal to control unit
Ignition coil (-)
Detects engine speed; sends signal to
terminal
control unit
Ignition switch
Sends engine cranking signal to control
(ST position)
unit
Inhibitor switch
Detects in-gear condition; sends signal to
EC-AT control unit
Injector
Injects fuel into intake port
Detects intake air temperature;
Intake air thermo
sensor
sends signal to control unit
Supplies electric current to injectors and
Main relay
control unit
Detects in-gear condition; sends signal to
Neutral switch
control unit
Detects Oxygen concentration; sends sig
Oxygen sensor
nal to control unit
Adjusts fuel pressure supplied to injectors
Pressure regulator
Pulsation damper
Absorbs fuel pulsation
Speedometer
Detects vehicle speed; sends signal to
control unit
Throttle sensor
Detects throttle valve opening angle;
sends signal to control unit
Water thermo sensor
Detects coolant temperature;
sends signal to control unit
Detects radiator coolant temperature;
Water thermo switch
sends signal to control unit
4A—44
Function
626, MX-6 Revised 10/87
Remarks
Intake air temp sensor and
fuel pump switch are in
tegrated
Switch ON when clutch pedal
released
• Operates while engine
running
• Installed in fuel tank
Installed on throttle body
Switch ON in " N" or "P"
range
• Controlled by signals from
control unit
• High-ohmic injector
Installed in air flow meter
Switch ON when in-gear
Zirconia ceramic and plati
num coating
ON: Above 113 mph
(180 km/h)
Installed on throttle body
ON: above 17°C (63°F)
Application
New
Previous
model
model
O
0
O
0
o
0
o
o
o
X
o
o
o
0
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
0
o
o
o
o
o
o
X
o
o
o
o
o
o
86U04A-066
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Table of Contents
Troubleshooting
