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Kawasaki Z750 03 Service Manual ENG By Mosue.pdf
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FUEL SYSTEM (DFI) 3-47

Inlet Air Temperature Sensor (Service Code 13)

Removal/Installation

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 tempera-

ture sensor.

Pull out the inlet air temperature sensor.

Put the inlet air temperature sensor into the grommet.

Output Voltage Inspection

NOTE

Be sure the battery is fully charged.

The output voltage changes according to the inlet air temperature.

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

Measure the sensor output voltage engine

stopped and the connector joined.

Turn the ignition switch ON. thewith

Inlet Air Temperature Sensor Output Voltage

Connections to ECU Connector

Meter (+) → Y lead (terminal 18)

Meter (–) → BR/BK lead (terminal 14)

Standard: about 2.25 2.50 V at inlet air temperature

20°C (68°F)

Turn the ignition switch OFF.

If the output voltage is out of the standard, remove the fuel tank and check the wiring. And if the output voltage is 4.8 V, the ECU is normal.

If the output voltage is within the standard, check the ECU for its ground, and power supply (see ECU section in this chapter).

If the wiring is good, check the sensor resistance. 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

3-48 FUEL SYSTEM (DFI)

Inlet Air Temperature Sensor (Service Code 13)

SensorResistance Inspection

Remove the inlet air temperature sensor (see this sec-

tion).

Suspend the sensor [A] in a container of machine oil so

that the heat-sensitive portion is submerged.

Suspend a thermometer [B] with the heat-sensitive portion [C] located in almost the same depth with the sensor.

NOTE

The sensor and thermometer must not touch the container side or bottom.

Place the container over a source of heat and gradually raise the temperature of the oil while stirring the oil gently

for even temperature.

Using a digital meter, measure the internal resistance of the sensor across the terminals at the temperatures shown in the table.

Inlet Air Temperature Sensor Resistance Standard: 1.6 3.7 kΩ at 20°C (68°F)

0.24 0.43 kΩ at 80°C (176°F)

If the measurement is out of the range, replace the sensor. If the measurement is within the specified, replace the ECU.

A. ECU

F. Inlet Air Temperature Sensor

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