Toyota 3S-GE Repair Manual page 185

ENGINE - EFI SYSTEM E6471
Negative (—) Terminal Cable
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4. PRECAUTIONS WHEN HANDLING OXYGEN
SENSOR
(a) Do not allow the oxygen sensor to drop or hit against
an object.
(b) Do not allow the sensor to come into contact with
water.
EG48l—0I
IF VEHICLE IS EQUIPPED WITH MOBILE
RADIO SYSTEM (HAM. CB, ETC.)
If the vehicle is equipped with a mobile communica-
tion system, refer to the preaution in the IN section.
EGl30—I'II
AIR INDUCTION SYSTEM
1. Separation of the engine oil dipstick, oil filler cap, PCV
hose, etc. may cause the engine to run out of tune.
Disconnection, looseness or cracks in the parts of the
air induction system between the throttle body and
cylinder head will cause air suction and cause the
engine to run out of tune.
2.
E6434 *0!
ELECTRONIC CONTROL SYSTEM
1. Before removing EFI wiring connectors, terminals.
etc., first disconnect the power by either turning the
ignition switch OFF or disconnecting the negative (—)
terminal cable from the battery.
HINT: Always check the diagnostic code before dis-
connecting the negative (—) terminal cable from the
battery.
2. When installing the battery, be especially careful not
to incorrectly connect the positive (+) and negative
(—) cables.
Do not permit parts to receive a severe impact during
removal or installation. Handle all EFI parts carefully,
especially the ECU.
Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal
contact can cause further troubles.
Do not open the ECU cover.
3.
4.
5.