3-46 FUEL SYSTEM (DFI)
Intake Air Pressure Sensor (Service Code 12)
If the reading is within the usable range, remove the ECU
and check the wiring for continuity between main harness
Special Tool - Hand Tester: 57001-1394
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Intake Air Pressure Sensor Connector [B]
O/G lead (ECU terminal 46) [C]
BR/Y lead (ECU terminal 55) [D]
If the wiring is good, check the sensor for various vacuum.
Remove the intake air pressure sensor [A] and disconnect
the vacuum hose from the sensor.
Connect an auxiliary hose [B] to the intake air pressure
Temporarily install the intake air pressure sensor.
Connect a digital meter [C], vacuum gauge [D], the fork oil
level gauge [E] and the measuring adapter to the intake
air pressure sensor.
Special Tools - Fork Oil Level Gauge: 57001-1290
Vacuum Gauge: 57001-1369
Measuring Adapter: 57001-1700
Intake Air Pressure Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → W (main harness O/G) lead
Digital Meter (–) → BK (main harness BR/Y) lead
Turn the ignition switch ON.
Measure the intake air pressure sensor output voltage
from various vacuum readings, while pulling the handle
of the fork oil level gauge.
Check the intake air pressure sensor output voltage, us-
ing the following formula and chart.
Pg: Vacuum Pressure (Gauge) of Throttle Body
Pl: Local Atmospheric Pressure (Absolute) measured by
Pv: Vacuum Pressure (Absolute) of Throttle Body
Vv: Sensor Output Voltage (V)