FUEL SYSTEM (DFI) 3-45
Inlet Air Pressure Sensor (Service Code 12)
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Turn the ignition switch ON.
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Measure the inlet air pressure sensor output voltage from
various vacuum readings, while pulling the handle of the
fork oil level gauge.
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Check the inlet air pressure sensor output voltage, using
the following formula and chart.
Suppose:
Pg : Vacuum Pressure (gauge) to Sensor
Pl : Local Atmospheric Pressure (absolute) m easured by
a barometer
Pv : Vacuum Pressure (absolute) to Sensor
Vv : Sensor Output Voltage (v)
then
Pv = Pl – P
g
For example, suppose the following data is obtained:
Pg = 8 cmHg (vacuum gauge reading)
Pl = 70 cmHg (barometer reading)
Vv = 3.2 V (digital volt meter reading)
then
Pv=70–8=62cmHg(abs)
Plot this Pv (62 cmHg) at a point [1] on the chart and draw a
vertical line through the point. Then, you can get the usable
range [2] of the sensor output voltage.
Usable range = 3.04 ∼ 3.49 V
Plot Vv (3.2 V) on the vertical l ine. → Point [3].
Results: In the chart, Vv is within the usable range and
the sensor is normal.
