3-50 FUEL SYSTEM (DFI)
Inlet Air Pressure Sensor (Service Code 12)
If the output voltage is far out of the usable range, check
the output voltage again at the sensor connector [A]
(when the lead is open, the output voltage is about 1.8
Connect a digital meter to the harness adapter leads.
Inlet Air Pressure Sensor [B]
Special Tool - Sensor Harness Adapter: 57001-1561
Inlet Air Pressure Sensor Output Voltage
Connections to Sensor
Meter (+) → Y/BL lead [C]
Meter (–) → BR/BK lead [D]
Output Voltage at Sensor Connector
Usable Range: DC 3.80 ∼ 4.20 V at the standard
atmospheric pressure (101.32 kPa or
76 cmHg abs.)
If the output voltage is normal, check the wiring for conti-
nuity (see following diagram).
If the output voltage is out of the usable range, replace
Turn the ignition switch OFF.
Remove the sensor harness adapter.
2. Inlet Air Pressure Sensor
If you need to check the inlet air pressure sensor for vac-
uum other than 76 cmHg (abs.), check the output voltage