3-50 FUEL SYSTEM (DFI)
Inlet Air Pressure Sensor (Service Code 12)
If the output voltage is normal, check the inlet air pressure
sensor output voltage for vacuum other than 76 cmHg
(abs) as follows. If the output voltage changes within the
usable range as vacuum changes, the sensor is normal
and the ECU is suspect. Replace the ECU.
Remove the fuel tank (see this chapter).
Remove the inlet air pressure sensor [D] and disconnect
the vacuum hose from the sensor.
Connect an auxiliary hose [E] to the inlet air pressure sen-
Temporarily install the inlet air pressure sensor.
Connect a commercially available digital meter [A], the
needle adapters [F], vacuum gauge [B], and the fork oil
level gauge [C] to the inlet air pressure sensor.
Special Tools - Fork Oil Level Gauge: 57001-1290
Needle Adapter Set: 57001–1457
Digital Volt Meter Connections
Meter (+) → W/BL lead of Inlet Air Pressure Sensor
Meter (–) → BR/BK lead of Inlet Air Pressure Sensor
Turn the ignition SW 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 charts for Pv = 24