Sensor Resistance Inspection

• Remove the inlet air temperature sensor (see this sec­tion).

• 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

O 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 kH at 20°c (68°f)

0.24 ~ 0.43 kQ 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.

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Inlet Air Temperature Sensor (Service Code 13)

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1. ECU

2. Inlet Air Temperature Sensor

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FUEL SYSTEM (DFI) 3-79

Removal/lnstalla tion

~ CAUTION

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

• Disconnect the sensor connector [A], and unscrew the water temperature sensor [B],

Torque - Water Temperature Sensor: 25 N m (2.5 kgf-m, 18 ft-lb)

• Fill the engine with coolant and bleed the air from the cooling system (see Coolant Filling in the Cooling System chapter).

Output Voltage Inspection

NOTE

O Be sure the battery is fully charged.

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

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

Special Tool - Needle Adapter Set: 57001-1457

Water Temperature Sensor Output Voltage Connections to ECU Meter (+) -» O lead (terminal 5)

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 3 ~ 6 V at 20°C (68^CF)

NOTE

O The output voltage changes according to the coolant temperature in the engine.

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Water Temperature Sensor (Service Code 14)

• Turn the ignition switch OFF.

• If the output voltage is out of the specified, check the ECU for its ground, and power supply (see 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 5V), check the wiring (see next diagram).

• If the wiring is good, check the water temperature 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

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1. ECU 2. Meter 3. Water Temperature Sensor

Sensor Resistance Inspection

• Remove the water temperature sensor (see this section).

• Refer to Electrical System chapter for water temperature sensor inspection.

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Removal

• Turn the ignition switch off.

• Remove:

Air Cleaner Housing (see Air Cleaner Housing Removal) Atmospheric Pressure Sensor Connector [A] Atmospheric Pressure Sensor Screw [B]

Atmospheric Pressure Sensor [C]

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Installation

NOTE

O The atmospheric pressure sensor is the same part as the inlet air pressure sensor except that the inlet air pressure sensor has a inlet air pressure hose and dif­ferent wiring.

• Installation is reverse of removal.

• Tighten the sensor bolts.

Torque - Atmospheric Pressure Sensor Screw: 4.9 N-m (0.50 kgf-m, 43 in-lb)

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