ELECTRICAL SYSTEM 16-101
Switches and Sensors
Water Temperature Sen sor Inspection
•
Remove the water temperature sensor (see Removal/In-
stallation in the Fuel System (DFI) chapter).
•
Suspend the sensor [A] in a container of coolant so that
the temperature-sensing projection [E] and threaded por-
tion [E] are submerged.
•
Suspend an accurate thermometer [B] in the coolant.
NOTE
○
The sensor and thermometer must not touch the con-
tainer side or bottom.
•
Place the container over a source of heat and gradu-
ally raise the temperature of the coolant while stirring the
coolant gently.
•
Using the hand tester, measure the internal resistance of
the sensor.
○
The sensor sends electric signals to the ECU and coolant
temperature gauge in the meter unit.
○
Measure the resistance across the terminals and the body
(for the gauge) at the temperatures shown in the table.
If the hand tester does not show the specified values, re-
place the sensor.
Water Temperature Sensor
Resistance for ECU [C]
Temperature
Resistance (kΩ)
(Terminal [1]-[3])
20°C (68°F)
2.46
+0.115
–0.143
80°C (176°F) 0.32 ±0.011
110°C (230°F) 0.1426 ±0.0041
Resistance for Water Temperature Gauge [D]
Temperature
Resistance (Ω)
(Terminal [2]-Body)
50°C (122°F)
210 ±40
120°C (248°F)
21.2 ±1.5
Speed Sensor Removal
•
Drain the coolant (see Coolant Change in the Periodic
Maintenance chapter).
•
Remove:
Engine Sprocket Cover (see Engine Sprocket Removal
in the F inal Drive chapter)
Water Hose [A]
