Atmospheric Pressure Sensor (Service Code 15)
Never drop the sensor, especially on a hard surface.
Such a shock to the sensor can damage it.
Turn the ignition switch off.
Air Cleaner Housing (see Air Cleaner Housing Removal)
Atmospheric Pressure Sensor Connector [A]
Atmospheric Pressure Sensor Screw [B]
Atmospheric Pressure Sensor [C]
The atmospheric pressure sensor is the same part as
the inlet air pressure sensor except that the inlet air
pressure sensor has a inlet air pressure hose and dif-
Installation is reverse of removal.
Tighten the sensor bolts.
Torque - Atmospheric Pressure Sensor Screw: 4.9 N·m
(0.50 kgf·m, 43 in·lb)
Input Voltage Inspection
Be sure the battery is fully charged.
The inspection is the same as "Input Voltage Inspection"
of the throttle sensor and the inlet air pressure sensor.
Turn the ignition switch OFF.
Remove the ECU (see this chapter). Do not disconnect
the ECU connectors.
Connect a digital voltmeter [A] to the connector [B], with
the needle adapter set.
Special Tool - Needle Adapter Set: 57001–1457
Atmospheric Pressure Sensor Input Voltage
Connections to ECU
Meter (+) → BL lead (terminal 1)
Meter (–) → BR/BK lead (terminal 14)
Measure the input voltage with the engine stopped, and
with the connectors joined.
Turn the ignition switch ON.
Input Voltage at ECU
If the reading of input voltage is less than the standard
range, check the ECU for its ground, and power supply
(see this chapter). If the ground and power supply are
good, replace the ECU.
4.75 ∼ 5.25 V DC
FUEL SYSTEM (DFI) 3-81