FUEL SYSTEM
VALVE>
Inspection of
Components
BAROMETRIC PRESSURE SENSOR
Volume air
pressure
sensor
Voltage
pressure
760
(3) Measure resistance while heating the sensor using a hair
drier.
T e m p e r a t u r e
Resistance
Smaller
(4) If the value deviates from the standard value or the resist-
ance remains unchanged, replace the volume air flow sen-
sor assembly.
Volume air flow
sensor connector
Harness side
connector
I
Engine control module
control module connector
OPERATION
l
The barometric-pressure sensor functions to
convert the barometric pressure to voltage, and
to input that voltage (as signals) to the engine
control module.
The engine control module, based upon those
signals, then corrects the amount to fuel
etc.
l
The
power supply within the engine control
module is supplied to the barometric-pressure
sensor; it passes through the circuitry within the
sensor, and is grounded at the engine control
module.
l
The barometric-pressure sensor output voltage
is sent to the engine control module in propor-
tion to the barometric pressure (absolute pres-
sure).
TSB Revision
Summary of Contents for 1989 Galant
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