FUEL SYSTEM (DFI) 3-49

Water Temperature Sensor (Service Code 14)

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).

•Drain the coolant (see Cooling System chapter).

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

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 Change in the Periodic Maintenance chapter).

Output Voltage Inspection

NOTE

•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

Measure the sensor output voltage engine

•stopped and the connector joined. Turn the ignition switch ON. thewith○Be sure the battery is fully charged.

Water Temperature Sensor Output Voltage

Connections to ECU

Meter (+) → O lead (terminal 5)

Meter (–) → BR/BK lead (terminal 14)

Standard: about 2.80 2.97 V at 20°C (68°F)

NOTE

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

•Turn the ignition switch OFF.

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

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 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