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FUEL SYSTEM (DFI) 3-59
Inlet Air Pressure Sensor (Service Code 12)
•
Remove the inlet air pressure sensor [A] and disconnect
the vacuum hose from the sensor.
•
Connect an auxiliary hose [B] to the inlet air pressure sen-
sor.
•
Temporarily install the inlet air pressure sensor.
○
Connect a digital meter [C], vacuum gauge [D], and the
fork oil level gauge [E] to the inlet air pressure sensor.
Special Tools - Fork Oil Level Gauge: 57001-1290
Vacuum Gauge: 57001-1369
Sensor Harness Adapter: 57001-1561
Inlet Air Pressure Sensor Output Voltage Connection to
Adapter
Meter (+) → G/W (sensor Y/BL) lead
Meter (–) → BK (sensor BR/BK) lead
○
Turn the ignition switch ON.
○
Measure the inlet air pressure sensor output voltage from
various vacuum readings, while pulling the handle of the
fork oil level gauge.
○
Check the inlet air pressure sensor output voltage, using
the following formula and chart.
Suppose:
Pg : Vacuum Pressure (gauge) of Throttle Assy
Pl : Local Atmospheric Pressure (abs.) measured by a
barometer
Pv : Vacuum Pressure (abs.) of Throttle Assy
Vv : Sensor Output Voltage (v)
then
Pv = Pl – Pg
For example, suppose the following data is obtained:
Pg = 8 cmHg (vacuum gauge reading)
Pl = 70 c mHg (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 = 3.08 ∼ 3.48 V
Plot Vv (3.2 V) on the vertical line. → Point [3].
Results: In the chart, Vv is within the usable range and
the sensor is normal.
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