3-52 FUEL SYSTEM (DFI)
Water Temperature Sensor (Service Code 14)
Water Temperature Sensor Removal/Installation
Never drop the sensor, especially on a hard surface.
Such a shock to the sensor can damage it.
Drain the coolant (see Coolant Change in the Periodic
Disconnect the sensor connector [A], and unscrew the
water temperature sensor [B].
Torque - Water Temperature Sensor: 12 N·m (1.2 kgf·m, 106
Apply grease to new O-ring on the water temperature sen-
Fill the engine with coolant and bleed the air from the cool-
ing system (see Coolant Change in the Periodic Mainte-
Water Temperature Sensor Output Voltage Inspection
Be sure the battery is fully charged.
Remove the ECU (see ECU Removal). Do not disconnect
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 with the engine
stopped and the connector joined.
Turn the ignition switch ON.
Water Temperature Sensor Output Voltage
Connections to ECU
Meter (+) → O lead (terminal 20)
Meter (–) → BR/BK lead (terminal 28)
about 2.80 ∼ 2.97 V at 20°C (68°F)
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 ECU Power Supply
If the output voltage is out of the standard, check the
wiring. And if the output voltage is 4.8 V, the ECU is nor-
If the wiring is good, check the water temperature sensor
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