Inlet Air Pressure Sensor (Service Code 12)

• Remove the inlet air pressure sensor [A] and disconnect the vacuum hose from the sensor.

ODo not disconnect the sensor connector.

• Connect an auxiliary hose [B] to the inlet air pressure sen­sor.

• Temporarily install the inlet air pressure sensor.

O Connect a commercially available digital meter [C], vac­uum gauge [D], and the fork oil level gauge [E] to the inlet air pressure sensor.

Special Tools - Fork Oil Level Gauge: 57001-1290

Throttle Sensor Harness Adapter #2: 57001 -1408

Inlet Air Pressure Sensor Output Voltage Connection to Sensor

Meter (+) -» Y/BL lead Meter (-) -> BR/BK lead

oTurn the ignition switch ON.

O Measure the inlet air pressure sensor output voltage from various vacuum readings, while pulling the handle of the fork oil level gauge.

o Check the inlet air pressure sensor output voltage, using the following formula and chart.

Suppose:

Pg : Vacuum Pressure (gauge) of Throttle Assy PI : Local Atmospheric Pressure (absolute) measured by a barometer

Pv : Vacuum Pressure (absolute) of Throttle Assy Vv : Sensor Output Voltage (v)

then

Pv = PI - Pg

For example, suppose the following data is obtained:

Pg = 8 cmHg (vacuum gauge reading)

PI = 70 cmHg (barometer reading)

Vv = 3.2 V (digital volt meter reading)

then

Pv = 70 - 8 = 62 cmHg (abs)

Plot this Pv (62 cmHg) at a point [1] on the chart and draw a vertical line through the point. Then, you can get the usable range [2] of the sensor output voltage.

Usable range = 3.08 - 3.48 V Plot Vv (3.2 V) on the vertical line. Point [3],

Results: In the chart, Vv is within the usable range and the sensor is normal.

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Inlet Air Pressure Sensor (Service Code 12)

Pv: Throttle Vacuum Pressure (absolute) ST: Standard of Sensor Output Voltage (v)

Ps: Standard Atmospheric Pressure (abso- _n ........ . .

l_utej UR: Usable Range of Sensor Output Voltage (v)

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Inlet Air Temperature Sensor (Service Code 13)

Removal/lnstallation

CAUTION

Never drop the sensor, especially on a hard surface. Such a shock to the sensor can damage it.

• Remove the fuel tank (see Fuel Tank Removal).

• Disconnect the connector [A] from the inlet air tempera­ture sensor.

• Pull out the inlet air temperature sensor [Bj.

Output Voltage Inspection

NOTE

O Be sure the battery is fully charged.

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

• Connect a digital voltmeter to the ECU connector, using needle adapter set.

Special Tool - Needle Adapter Set: 57001-1457

Inlet Air Temperature Sensor Output Voltage Connections to ECU Connector Meter (+) P lead (terminal 18)

Meter (-) -» BR/BK lead (terminal 14)

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

• Turn the ignition switch ON.

Output Voltage at ECU

Standard: about 2.25 - 2.50 V at inlet air

temperature 20°C (68°F)

NOTE

O The output voltage changes according to the inlet air temperature.

• Turn the ignition switch OFF.

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FUEL SYSTEM (DFI) 3-77

• If the output voltage is out of the specified, check the ECU for its ground, and power supply (see ECU section in this chapter). If the ground and power supply are good, re­place the ECU.

• If the output voltage is far out of the specified (e.g. when the wiring is open, the voltage is about 4.6 V), remove the fuel tank cover, and check the wiring (see next diagram).

• Remove the needle adapter set, and apply silicone sealant to the seals of the connector for waterproofing.

Silicone Sealant (Kawasaki Bond: 56019-120)

- Seals of ECU Connectors

★ If the wiring is good, check the sensor resistance.