Toyota 3S-GE Repair Manual page 9

IN-7
INTRODUCTION — GENERAL REPAIR INSTRUCTIONS
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After the vehicle is jacked up, be sure to support it on
stands. It is extremely dangerous to do any work on a
vehicle raised on a jack alone, even for a small job that
can be finished quickly.
Observe the following precautions to avoid damage to
the parts:
Do not open the cover or case of the ECU unless
absolutely nnecessary. (If the IC terminals are tou-
ched, the IC may be destroyed by static electricity.)
To disconnect vacuum hoses, pull on the end, not the
middle of the hose.
To pull apart electrical connectors. pull on the connec-
tor itself. not the wires.
Be careful not to drop electrical components, such as
sensors or relays. If they are dropped on a hard floor.
they should be replaced and not reused.
When steam cleaning an engine. protect the distribu-
tor, air filter, and VCV from water.
Never use an impact wrench to remove or install
temperature switches or temperature sensors.
When checking continuity at the wire connector,
insert the tester probe carefully to prevent terminals
from bending.
When using a vacuum gauge, never force the hose
onto a connector that is too large. Use a step—down
adapter instead. Once the hose has been stretched, it
may leak.
Tag hoses before disconnecting them:
When disconnecting vacuum hoses, use tags to iden-
tify how they should be reconnected.
After completing a job, double check that the vacuum
hoses are properly connected. A label under the hood
shows the proper layout.
Unless otherwise stated, all resistance is measured at
an ambient temperature of 20°C (68° F). Because the
resistance may be outside specifications if measured
at high temperatures immediately after the vehicle
has been running, measurements should be made
when the engine has cooled down.