Water Temperature Sensor (Service Code 14)
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 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
Fill the engine with coolant and bleed the air from the cool-
ing system (see Coolant Change in the Periodic Mainte-
Output Voltage Inspection
Be sure the battery is fully charged.
The output voltage changes according to the coolant
temperature in the engine.
Remove the ECU (see ECU Removal). Do not disconnect
Connect a digital voltmeter to the ECU connector, using
two needle adapters.
Special Tool - Needle Adapter Set: 57001-1457
Measure the output voltage of the sensor with the engine
stopped and the connector joined.
Turn the ignition switch ON.
Water Temperature Sensor Output Voltage
Connections to ECU
(Other than Europe Models [A])
(Europe Models [B])
Turn the ignition switch OFF.
If the output voltage is out of the specified, check the ECU
for its ground, and power supply (see ECU Power Supply
Inspection). If the ground and power supply are good,
remove the fuel tank and check the wiring between the
ECU and the water temperature sensor for continuity.
If the wiring is good, check the water temperature sensor
Water Temperature Sensor Resistance Inspection
Refer to the Water Temperature Sensor Inspection in the
Electrical System chapter (see Water Temperature Sen-
sor Inspection in the Electrical System chapter).
Meter (+) → O lead (terminal 17)
Meter (–) → BR/BK lead (terminal 22)
Meter (+) → O lead (terminal 20)
Meter (–) → BR/BK lead (terminal 28)
about 2.80 ∼ 2.97 V at 20°C (68°F)
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FUEL SYSTEM (DFI) 3-59