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FUEL SYSTEM - Sensors
SENSORS
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GENERAL DESCRIPTION The types and functions of the sensors are as listed below. These sensors detect engine conditions and
send corresponding signals to the engine control unit.
SENSORS AIR FLOW SENSOR
FUNCTION Senses the intake arr volume with a Karman vortex flow meter.
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INTAKE AIR TEMPERATURE SENSOR BAROMETRIC PRESSURE SENSOR
Senses the Intake air temperature (temperature of air at the point of entry into the air cleaner).
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Senses the barometric pressure faltrtude) wrth a semiconductor diffusion type pressure sensor.
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$;;OOf;T TEMPERATURE
Senses the engine coolant tern
THROTTLE POSITI
Senses the throttle I
t IDLE POSITION SWITCH
Senses whether or not the accelerator pedal is being operated with a contact switch. Senses the top dead center on compression stroke of N O. 1 and No. 4 cylinders with an LED and photo diode pair.
CRANK ANGLE SENSOR
Senses the crank angle of each cylinder with an LED and photo diode pair. T
OXYGEN SENSOR
Senses actrvation of the air con POWER STEERING OIL PRESSURE SWITCH
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Senses the power steering ‘load with a contact switch.
Senses ON/OFF posrtion of the ignition switch. IGNITION SWITCH Senses engine cranking.
, IGNITION TIMING ADJUSTMENT TERMINAL
INHIBITOR SWITCH
When this terminal is shorted, the ignition timing and idle speed control servo is set in the adjustrng mode by the engine control unit. S e n s e s t h e *P” a n d “ N ” p o s i t the automatic transaxle. Senses. by pieto-electric element,. cylinder block vibrations that occur when there IS engine knocking.
CONTROL RELAY (Fuel pump drive signal)
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Senses ignrtton coil prIman/ voltage.
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