3-60 FUEL SYSTEM (DFI)

Inlet Air Pressure Sensor #2 (Service Code 16)

Inlet Air Pressure Sensor #2 Removal

CAUTION

Never drop the inlet air pressure sensor #2 especially on a hard surface. Such a shock to the sensor can damage it.

•Remove the air cleaner housing (see Air Cleaner Housing Removal).

•Disconnect the sensor connector [A].

•Remove the inlet air pressure sensor #2 [B] from the rubber damper in the bracket [C] and separate the vacuum hose [D].

Inlet Air Pressure Sensor #2 Installation

NOTE

○The inlet air pressure sensor #2 is the same part as the inlet air pressure sensor #1.

•Installation is the reverse of removal.

Inlet Air Pressure Sensor #2 Input Voltage

Inspection

NOTE

○Be sure the battery is fully charged.

•Turn the ignition switch OFF.

•Remove the air cleaner housing (see Air Cleaner Housing Removal).

•Disconnect the inlet air pressure sensor #2 connector and connect the harness adapter [A] between these connectors.

Special Tool - Measuring Adapter: 57001-1700

•Connect a digital meter to the harness adapter leads.

Inlet Air Pressure Sensor #2 Input Voltage Connections to Adapter:

Digital Meter (+) → R (sensor BL) lead Digital Meter (–) → BK (sensor BR/BK) lead

•Measure the input voltage with the engine stopped and with the connector joined.

•Turn the ignition switch ON.

Input Voltage

Standard: DC 4.75 5.25 V

•Turn the ignition switch OFF.

If the reading is within the standard, check the output voltage (see Inlet Air Pressure Sensor #2 Output Voltage Inspection).

FUEL SYSTEM (DFI) 3-61

Inlet Air Pressure Sensor #2 (Service Code 16)

If the reading is out of the standard, remove the ECU and check the wiring for continuity between main harness connectors.

Special Tool - Hand Tester: 57001-1394

○Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection

ECU Connector [A] ←→

Inlet Air Pressure Sensor #2 Connector [B]

BL lead (ECU terminal 10) [C]

BR/BK lead (ECU terminal 28) [D]

If the wiring is good, 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 Removal/Installation).

Inlet Air Pressure Sensor #2 Output Voltage Inspection

•Measure the output voltage at the inlet air pressure sensor #2 in the same way as input voltage inspection, note the following.

○Disconnect the inlet air pressure sensor #2 connector and connect the harness adapter [A] between these connectors.

Special Tool - Measuring Adapter: 57001-1700

Inlet Air Pressure Sensor #2 Output Voltage Connections to Adapter:

Digital Meter (+) → W (sensor G/W) lead Digital Meter (–) → BK (sensor BR/BK) lead

•Measure the output voltage with the engine stopped and with the connector joined.

•Turn the ignition switch ON.

Output Voltage

Usable Range: DC 3.80 4.20 V at standard atmospheric pressure (101.32 kPa, 76 cmHg absolute)

NOTE

○The output voltage changes according to the local atmospheric pressure.

•Turn the ignition switch OFF.

If the reading is out of the usable range, replace the sensor.

3-62 FUEL SYSTEM (DFI)

Inlet Air Pressure Sensor #2 (Service Code 16)

If the reading is within the usable range, remove the ECU and check the wiring for continuity between main harness connector.

Special Tool - Hand Tester: 57001-1394

○Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection

ECU Connector [A] ←→

Inlet Air Pressure Sensor #2 Connector [B]

G/W lead (ECU terminal 25) [C]

BR/BK lead (ECU terminal 28) [D]

If the wiring is good, check the sensor for various vacuum. ○Determine the local altitude (elevation).

If you know the local altitude, use the chart in this section.

If you know the local atmospheric pressure using a barometer, substitute the atmospheric pressure for Pv (vacuum pressure) in the inlet air pressure sensor #1 chart (see Inlet Air Pressure Sensor #1 Output Voltage Inspection).

○Get the usable range of the inlet air pressure sensor #2 output voltage in the same way as Output Voltage Inspection of the inlet air pressure sensor #1 and check if Va (output voltage) is within the usable range or not.

If the reading is out of the usable range, replace the sensor.

If the reading 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 Removal/Installation).

FUEL SYSTEM (DFI) 3-63

Inlet Air Pressure Sensor #2 (Service Code 16)

Atmospheric Pressure/Altitude Relationship

3-64 FUEL SYSTEM (DFI)

Inlet Air Pressure Sensor #2 (Service Code 16)

Inlet Air Pressure Sensor #2 Circuit

1.Inlet Air Pressure Sensor #2

2.ECU