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CARBURETOR HEATING SYSTEM
6 - 17
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
Couplers and leads connection
G
Rust/dust/looseness/short-circuit →
Repair or replace.
THERMO SWITCH INSPECTION
1. Inspect:
Thermo switch operation
G
Faulty operation → Replace.
Inspection steps:
Remove the thermo switch.
G
Connect the pocket tester to the thermo
G
switch coupler as shown.
Tester (+) lead → Black 1
Tester (–) lead → Black 2
Immerse the thermo switch in a container
G
filled with water 3.
Place a thermometer 4 in the water.
G
Slowly heat the water, and then let it cool to
G
the specified temperature as indicated in
the table.
Check the thermo switch for continuity at
G
the temperatures indicated in the table.
Å The thermo switch circuit is open.
ı The thermo switch circuit is closed.
Test step Water temperature Continuity
Less than 16 ± 3 ˚C
1
(60.8 ± 5.4 ˚F)
More than 16 ± 3 ˚C
2
(60.8 ± 5.4 ˚F)
More than 11 ± 3 ˚C
3
(51.8 ± 5.4 ˚F)
Less than 11 ± 3 ˚C
4
(51.8 ± 5.4 ˚F)
Test steps 1 & 2: Heating phase
Test steps 3 & 4: Cooling phase
–
+
ELEC
YES
NO
NO
YES
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