Maintenance Precautions; Precautions When Connecting Gauge; In Event Of Engine Misfire; Precautions When Handling Oxygen Sensor - Toyota 3VZ–FE Troubleshooting Manual

ENGINE TROUBLESHOOTING
PRECAUTIONS
1. Before working on the fuel system, disconnect the cable
from negative (–) terminal of the battery.
HINT: Any diagnostic trouble code retained by the computer
will be erased when the battery terminal is removed. There-
fore, if necessary, read the diagnosis before removing the
battery terminal.
2. Do not smoke or work near an open flame when working
on the fuel system.
3. Keep gasoline away from rubber or leather parts.

MAINTENANCE PRECAUTIONS

1. CHECK CORRECT ENGINE TUNE–UP
(See page EG–11)
2.

PRECAUTIONS WHEN CONNECTING GAUGE

(a) Use the battery as the power source for the timing light,
tachometer, etc.
(b) Connect the tester probe of a tachometer to the terminal IG
of the data link connector 1.
3. IN EVENT OF ENGINE MISFIRE, FOLLOWING
PRECAUTIONS SHOULD BE TAKEN
(a) Check proper connection of battery terminals, etc.
(b) Handle high–tension cords carefully.
(c) After repair work, check that the ignition coil terminals and all
other ignition system lines are reconnected securely.
(d) When cleaning the engine compartment, be especially
careful to protect the electrical system from water.
4.

PRECAUTIONS WHEN HANDLING OXYGEN SENSOR

(a) Do not allow oxygen sensor to drop or hit against an object.
(b) Do not allow the sensor to come into contact with water.
– SFI SYSTEM
EG–165
EG0G2–01
EG0G3–01