3-82 FUEL SYSTEM (DFI)
Atmospheric Pressure Sensor (Service Code 15)
If the reading is within the standard range, remove the
seat cover, and check the input voltage again at the sen-
Remove the air cleaner housing (see Air Cleaner Housing
Disconnect the atmospheric pressure sensor connector
and connect the harness adapter [A] between the main
harness connector and pressure sensor connector.
Connect a digital meter to the harness adapter leads.
[B] Atmospheric Pressure Sensor
Special Tool - Sensor Harness Adapter: 57001–1561
Atmospheric Pressure Sensor Input Voltage
Connections to Sensor
Meter (+) → BL lead [C]
Meter (–) → BR/BK lead [D]
Measure the input voltage with the engine stopped, and
with the connector joined.
Turn the ignition switch ON.
Input Voltage at Sensor Connector
If the reading is out of the standard range, check the
wiring (see wiring diagram in this section).
If the reading is good, the input voltage is normal. Check
the output voltage.
Turn the ignition switch OFF.
Output Voltage Inspection
Measure the output voltage at the ECU in the same way
as input voltage inspection. Note the following.
Digital Meter [A]
ECU Connector [B]
Atmospheric Pressure Sensor Output Voltage
Connections to ECU
Meter (+) → G/W lead (terminal 4)
Meter (–) → BR/BK lead (terminal 14)
The output voltage changes according to the local at-
The atmospheric sensor output voltage is based on
a nearly perfect vacuum in the small chamber of the
sensor. So, the sensor indicates absolute atmospheric
If the output voltage is within the usable 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
3.80 ∼ 4.20 V DC at the standard
atmospheric pressure (101.32 kPa,
76 cmHg abs.)