Toyota 4A-FE Repair Manual page 81

Fl-10
EFI SYSTEM - Inspection Precaution
Fl4475
FI009H10093
FI0095 FI0096
ELECTRONIC CONTROL SYSTEM
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 the battery, be especially careful not
to incorrectly connect the positive (+) and negative
(-) cables.
3.
Do not permit parts
to
touch during removal or installa-
tion.
Handle
all EFI
parts carefully and, in particular. the
ECU.
4. Take great care during troubleshooting as there are
numerous transistor circuits and even slight terminal
contact can cause further troubles.
5. Do not open the ECU cover.
6. When inspecting during rainy weather. take care to
prevent entry of water. Also. when washing the
engine compartment. prevent water from getting .on
the EFI parts and wiring connectors.
7. Parts should be replaced as an assembly.
8. Care is required when pulling out and inserting wiring
connectors.
(a) To pull the connector out, release the lock and pull on
the connector.
(b)
Fully insert the connector and check that it is locked.
9. When inspecting a connector with a volt/ohmmeter.
(a) Carefully move away the water-proofing rubber if it
is a water-proof type connector.