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ELECTRICAL SYSTEM 16-77
Switches and Sensors
•
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-
taine
r 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 s ensor sends electric signals to the E CU (Electronic
Control U nit) 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
Res
istance for ECU [C]
Resistance (kΩ)
Temperature
(T
erminal [1] - [3])
+0.155
20°C (68°F) 2.46
–0.143
80°C (176°F) 0.32 ± 0.011
110°C (230°F) 0.1426 ± 0.0041
Resistance for Water Temperature Gauge [D]
Resistance (Ω)
Temperature
(Terminal [2] - Body)
50°C (122°F)
210 ± 40
120°C (248°F) 21.2 ± 1.5
Speed Sensor Inspection
•
Disconnect:
Speed Sensor Connector [A]
•
Remove:
Engine Sprocket Cover [B] (see Final Drive chapter)