9-27
SIGNAL SYSTEM
–
+
ELEC
1. Coolant temperature warning light bulb
2.Thermo unit
•
Check the coolant temperature warning light
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
bulb and socket for continuity.
•
Does the thermo unit operate properly as
described above?
•
Remove the thermo unit from the cylinder
head.
•
Connect the pocket tester (
Ω ×
1) to the
thermo unit .
down to the specified temperature.
•
Immerse the thermo unit in coolant .
•
Place a thermometer in the coolant.
•
Slowly heat the coolant, then let it cool
temperatures indicated below.
•
Measure the thermo unit
resistance
the
and socket.
not come on when the start switch is pushed
on.
•
Are the coolant temperature warning light
bulb and socket OK?
4. The coolant temperature warning light does
Replace the coolant
temperature warning
light bulb, socket or
both.
YES
NO
1. Coolant temperature warning light bulb
•
Check the coolant temperature warning light
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
bulb and socket for continuity.
and socket.
not come on when the temperature is high
(more than 117~123 °C (242.6 ~ 253.4 °F)).
•
Are the coolant temperature warning light
bulb and socket OK?
5. The coolant temperature warning light does
Replace the coolant
temperature warning
light bulb, socket or
both.
YES
NO
1
3
2
YES
NO
Resistance
Replace the thermo
unit.
EBS01076
Test
step
Water temperature
Ω
Thermo unit
1
50 °C
(122 °F)
134~149
80 °C
(176 °F)
47~57
100 °C
(212 °F)
26~29
120 °C
(248 °F)
14~17
2
3
4
Tests : Heating phase
ON
OFF
112 ± 3 ˚C
(234 ± 5.5 ˚F)
120 ± 3 ˚C
(248 ± 5.5 ˚F)
WARNING
• Handle the thermo unit with special care.
• Never subject the thermo unit to strong
shocks. If the thermo unit is dropped, rep-
lace it.
Thermo unit
11 Nm (1.1 m • kg, 8.0 ft • lb)
Replace the coolant
temperature
warning light
controller.
