Inspection Of Components; Fuel Heater; Vacuum Switch - Toyota 1PZ Repair Manual

FUEL SYSTEM - Fuel Heater System

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.

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.
FU-7