FU-7
FUEL SYSTEM - Fuel Heater System
Vacuum Switch
1. INSPECT SWITCH CONTINUITY
Using an ohmmeter, check that there is no continuity
between terminal 1 and the switch body.
If continuity is not as specified, replace the fuel heater and
vacuum switch assembly.
2. INSPECT SWITCH OPERATION
(a) Apply a vacuum of 350 ± 50 mmHg (13.78 ± 1.97
in.Hg, 46.7 ± 86.7 kPa) or more to the vacuum switch
port.
(b) Using an ohmmeter, check that there is continuity
between terminal 1 and the switch body.
If operation is not as specified, replace the fuel heater and
vacuum switch assembly.
INSPECTION OF COMPONENTS
Fuel Heater
INSPECT FUEL HEATER
(a) Apply a vacuum of 350 ± 50 mmHg (13.78 ± 1.97
in.Hg, 46.7 ± 6.7 kPa) or more to the vacuum switch
port.
(b) Using an ohmmeter, measure the resistance between
terminal 1 and the switch body.
Resistance: 0.5-2.0 Q at 20°C (68°F)
If the resistance is not as specified, replace the fuel heater
and vacuum switch assembly.
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