Mazda MX-5 1990 Workshop Manual page 155

OUTLINE
F
Fuel vapor valve Prevents fuel from entering canister during
vehicle roll over
Fuel filter Filters particles from fuel
Fuel pump Provides fuel to injectors • Operates while engine running
• Installed in fuel tank
Igniter Receives spark signal from engine control
unit and generates high voltage in ignition coil
Detects hig h voltage ignition; sends substitute
ignition sigr al to engine control unit
Ignition switch
Sends engi ne cranking signal to engine
(START position)
control unit
Injector
Injects fuel into intake port • Controlled by signals from engine control
!
unit
• High-ohmic injector
• Single port injector nozzle
Intake air
Detects i nt1 ke air temperature; sends signal Installed in airflow meter
thermosensor to engine c ontrol unit
ISC valve Controls bypass air amount
• Controlled by duty signal from engine
control unit
• Controls idle-up
Solenoid valve
Controls evaporative fumes from canister to
• Controlled by duty signal from engine
(Purge control) intake manifold control unit
Main relay Supplies electric current to injectors, engine
control unit, etc.
MIL (Malfunction Lamp illuminates when input device mal- (TEN) terminal of diagnosis connector
indicator lamp) functions
Lamp flashes to indicate malfunction code (TEN) terminal of diagnosis connector
number. of input and output devices
Neutral switch Detects in-gear condition; sends signal to en- Switch ON when in neutral
gine control unit
Oxygen sensor Detects oxygen concentration; sends Signal to
Zirconia ceramic and platinum coating
engine control unit
PCV valve Controls blowby gas amount introduced into
engine
PIS pressure switch Detects PIS operation; sends signal to engine PIS: ON when steering wheel turned
control unit
Pressure regulator Adjusts fuel pressure supplied to injectors
Resonance chamber Improves mid range torque characteristics
Stoplight switch Detects braking operation (deceleration);
sends signal to engine control unit
Throttle body
Controls intake air quantity Integrated throttle sensor, ISC valve, and
dashpot
Throttle sensor Detects position of the throttle valve fully
IDL signal
closed; sends signal to engine control unit
Throttle sensor
Detects the throttle valve opening at a preset
POW signal
angle; sends sigr.lal to engine control unit
Two-way check valve
Controls pressure in fuel tank
Water thermosensor
Detects coolant temperature; sends signal to
engine control unit
05UOFX-009
F-11