17-54 ELECTRICAL SYSTEM
Switches and Sensors
Brake Light Switch Inspection
•
Refer to the Brake Light Switch Inspection in the Periodic
Maintenance chapter.
Radiator Fan Switch Inspection
•
Remove the radiator fan switch (see Radiator Fan Switch
Removal in the Cooling System chapter).
•
Suspend the fan switch [A] in a container of coolant so that
the temperature sensing projection and threaded portion
are submerged.
•
Suspend an accurate thermometer [B] in the coolant, so
that the sensitive portions [C] are located in almost the
same depth.
NOTE
○
The switch and thermometer m ust not touch the con-
tainer sides 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 switch across the terminals at the temperatures
shown in the table.
Special Tool - Hand Tester: 57001-1394
If the hand tester does not show the specified values, re-
place the switch.
Radiator Fan Switch Resistance
Rising Temperature:
From OFF to ON at 86 ∼ 90°C (187 ∼ 194°F)
Falling Temperature:
From ON to OFF at 81 ∼ 85°C (178 ∼ 185°F)
ON: Less than 0.5 Ω
OFF: More than 1 M Ω
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