FUEL SYSTEM (DFI) 3-47
Inlet Air Pressure Sensor (Service Code 12)
Inlet Air Pressure Sensor Output Voltage
Inspection
NOTE
○
The output voltage changes according to the local at-
mospheric pressure.
•
Measure the output voltage at the ECU in the same way
as input voltage inspection. Note the following.
Special Tool - Needle Adapter Set: 57001-1457
Inlet Air Pressure Sensor Output Voltage
Connections to ECU Connector
Meter (+) → G/Y lead (terminal 1)
Meter (–) → BR/BK lead (terminal 10)
Usable Range:
DC 3.80 ∼ 4.20 V at the standard
atmospheric pressure (101.32 kPa, 76
cmHg abs.)
•
Turn the ignition switch OFF.
If the output voltage is within the usable range, check the
ECU for its ground, and power supply (see ECU Power
Supply Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
If the output voltage is out of the usable range, check the
wiring.
If the wiring is good, check the sensor for various vacuum.
•
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], the fork
oil level gauge [E] and the harness adapter to the inlet air
pressure sensor.
Special Tools - Fork Oil Level Gauge: 57001-1290
Sensor Harness Adapter: 57001-1561
Inlet Air Pressure Sensor Output Voltage
Connections to Adapter
Meter (+) → G/W (sensor G/Y) lead
Meter (–) → BK (sensor BR/BK) lead
•
Turn the ignition switch ON.
•
Measure the output voltage from various vacuum readings, while pulling the handle of the fork oil
level gauge.
If the output voltage for various vacuum is normal, check the ECU for its ground, and power supply
(see ECU Power Supply Inspection).
•
Check the output voltage, using the following formula and chart.
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