Inlet Air Pressure Sensor (Service Code 12)

Input Voltage Inspection

NOTE

O Be sure the battery is fully charged.

O The inspection is the same as ‘‘Input Voltage Inspection” of the throttle sensor and the atmospheric pressure sen­sor.

• Turn the ignition switch OFF.

• Remove the ECU (see this chapter). Do not disconnect the ECU connectors.

• Connect a digital voltmeter [A] to the connector [B], with the needle adapter set.

Special Tool - Needle Adapter Set: 57001-1457

Inlet Air Pressure Sensor Input Voltage Connections to ecu

Meter (+)-> BL lead (terminal 1)

Meter (-) -> BR/BK lead (terminal 14)

• Measure the input voltage with the engine stopped, and with the connectors joined.

• Turn the ignition switch ON.

Input Voltage at ecu Standard: 4.75 - 5.25 V dc

• If the reading is less than the standard range, check the ECU for its ground, and power supply (see this chapter). If the ground and power supply are good, replace the ECU.

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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 sub harness connector and inlet air pressure sensor connector.

• Connect a digital meter to the harness adapter leads.

[B] Inlet Air Pressure Sensor Special Tool - Throttle Sensor Harness Adapter #2: 57001-1408

Inlet Air Pressure Sensor Input Voltage Connections to Sensor Meter (+) -» BL lead [C]

Meter (-) -► BR/BK lead [D]

• Measure the input voltage with the engine stopped.

• Turn the ignition switch ON.

Input Voltage at Sensor Connector Standard: 4.75 ~ 5.25 V DC

• 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.

Inlet Air Pressure Sensor Output Voltage Connections to ECU Meter (+) -> Y/BL lead (terminal 17)

Meter (-) BR/BK lead (terminal 14)

Output Voltage at ECU

Usable Range: 3.80 - 4.20 V DC at the standard

atmospheric pressure (101.32 kPa, 76 cmHg abs.)

NOTE

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

O 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 this chapter). If the ground and power supply are good, replace the ECU.

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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

V).

• Connect a digital meter to the harness adapter leads.

2. Inlet Air Pressure Sensor Special Tool - Throttle Sensor Harness Adapter #2: 57001-1408

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: 3.80 - 4.20 V DC at the standard

atmospheric pressure (101.32 kPa or 76 cmHg absolute)

• If the output voltage is normal, check the wiring for conti­nuity (see next diagram).

• If the output voltage is out of the usable range, replace the sensor.

• Turn the ignition switch OFF.

• Remove the throttle sensor harness adapter.

★ If you need to check the inlet air pressure sensor for vac­uum other than 76 cmHg (abs), check the output voltage as follows:

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