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FUEL SYSTEM (DFI) 3-57
Inlet Air Pressure Sensor (Service Code 12)
If the reading is within the standard range, and check the
input voltage again at the sensor connector.
•
Remove the air cleaner housing (see Air Cleaner Housing
Removal).
•
Disconnect the inlet air pressure sensor connector and
connect the harness adapter [A] between the harness
connector and inlet air pressure sensor connector.
Special Tool - Sensor Harness Adapter: 57001-1561
•
Connect a digital meter to the harness adapter leads.
Inlet Air Pressure Sensor [B]
Inlet Air 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.
•
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]
Connector [B]
Special Tool - Needle Adapter Set: 57001-1457
Inlet Air Pressu re Sensor Output Voltage
Connections to ECU
Meter (+) → Y/BL lead (terminal 28)
Meter (–) → BR/BK lead (terminal 34)
Output Voltage at ECU
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 vacuum sensor output voltage is based on a nearly
perfect vacuum in the small chamber of the sensor. So,
the sensor indicates absolute vacuum 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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