Inspection Of Vacuum Circuit - Toyota HILUX 1993 Repair Manual

BE–76

INSPECTION OF VACUUM CIRCUIT

Turn ignition switch off.
VACUUM HOSE
Are there cracks or other damage on the vac–
uum hose?
VACUUM SWITCH
INSPECT VACUUM SWITCH CIRCUIT
Disconnect connector from vacuum switch.
Is there continuity terminal 2 of vacuum
switch and ground?
INSPECT VACUUM SWITCH OPERATION
Is vacuum switch normal?
(See page BE–82)
VACUUM PUMP
INSPECT GROUND CONNECTION
Disconnect connector from vacuum pump.
Is there continuity between terminal 2 of wire
harness side connector and ground?
INSPECT VACUUM PUMP OPERATION
Is vacuum pump operation normal?
(See page BE–82)
Connect connector to vacuum switch and
pump.
BODY ELECTRICAL SYSTEM
Yes
Yes
Yes
Yes
CONTINUED ON NEXT PAGE
– Cruise Control System
Yes
Replace vacuum hose.
Open circuit in wire harness between
terminal 2 of vacuum switch and
ground.
Ground faulty.
Replace vacuum switch.
Open circuit in wire harness between
terminal 2 of vacuum pump and ground.
Ground faulty.
Replace vacuum pump.