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FUEL SYSTEM (DFI) 3-67
Atmospheric Pressure Sensor (Service C ode 15)
If the reading is w ithin the standard range, remove the
seat cover, and check the input voltage again at the sen-
sor connector.
•
Disconnect the atmospheric pressure sensor connector
and connect the harness adapter [A] between the harness
connector and atmospheric pressure sensor connector.
Special Tool - Sensor Harness Adapter: 57001-1561
•
Connect a digital meter to the harness adapter leads.
Atmospheric Pressure Sensor [B]
Atmospheric Pressure Sensor Input Voltage
Connections to Adapter
Meter (+) → G (sensor BL) lead [C]
Meter (–) → BK (sensor BR/BK) l ead [D]
•
Measure the input voltage with the engine stopped, and
with the connector joined.
•
Turn the ignition switch ON.
Input Voltage at Sensor Connector
Standard: DC 4.75 ∼ 5.25 V
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]
Special Tool - Needle Adapter Set: 57001-1457
Atmospheric Pressure Sensor Output Voltage
Connections to ECU Connector
Meter (+) → G/W lead (terminal 11)
Meter (–) → BR/BK lead (terminal 34)
Output Voltage
Usable Range:
DC 3.80 ∼ 4.20 V at the standard
atmospheric pressure (101.32 kPa, 76
cmHg abs.)
NOTE
○
The output voltage changes according to the local at-
mospheric pressure.
○
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
pressure.
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 section).
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