Toyota 4-Runner 1985 Repair Manual page 174

EFI SYSTEM -
Inspection Precautions
FI-5
FI0002
WHEN CAR IS EQUIPPED WITH A MOBILE
RADIO SYSTEM (HAM, CB, ETC.)
The ECU has been designed so that it will not be affected
by outside interference.
However, if your vehicle is equipped with an amature radio
transceiver, etc. (even one with about 10 W output), it may,
at times, have an effect upon ECU operation, especially if
the antenna and feeder are installed nearby.
Therefore, observe the following precautions.
(a) Install the antenna as far as possible from the ECU.
The ECU is located into the right side kick panel so
the antenna should be installed at the rear, left side
of the vehicle.
If installing in the bumper, do so on the right side, if
possible.
(b) Keep the antenna feeder as far away as possible from
the ECU wires - at least
20
cm (7.87 in.) - and,
especially, do not wind them together.
(c) Insure that the feeder and antenna are properly
adjusted.
(d) Do not equip your vehicle with a powerful mobile radio
system.
'NT AKE SYSTEM
1. Separation of the engine oil level gauge, oil filler cap, PCV
hose, etc. may cause the engine to run out of tune.
2. Disconnection, looseness or cracks in the parts of the air
intake system between the air flow meter and cylinder head
will allow air suction and cause bad engine tune.
ELECTRONIC PARTS
1. Before removing EFI wiring connectors, terminals, etc., first
disconnect power by either turning OFF the ignition switch
or disconnecting the battery terminals.
2. When installing a battery, be especially careful not to in-
correctly connect the positive and negative cables.
3. Do not permit parts to receive a severe impact during
removal or installation. Handle all EFI parts carefully and,
in particular, the ECU.
4. Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal con-
tact can cause further troubles.
5. Do not open the ECU cover.
6. When inspecting during rainy weather, take care to pre-
vent entry of water. Also, when washing the engine com-
partment, prevent water from getting on the EFI parts and
wiring connectors.
7. Parts should be replaced as an assembly.