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010XP--02
D32092
INCORRECT
INCORRECT
CORRECT
D25087
Looseness of Crimping
Core Wire
Terminal
Deformation
Pull Lightly
01--32
--
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
COROLLA Supplement (RM1129E)
ELECTRONIC CIRCUIT INSPECTION PROCEDURE
1.
BASIC INSPECTION
(a)
WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS
(1)
Unless stated, all resistance measurements should be made at an ambient temperature of 20
_
C
(68
_
F). Resistance measurements may be outside the specifications if measured at high tem-
peratures, i.e. immediately after the vehicle has been running. Measurements should be made
after the engine has cooled down.
(b)
HANDLING CONNECTORS
(1)
When disconnecting a connector, first squeeze the
mating halves tightly together to release the lock,
and then press the lock claw and separate the con-
nector.
(2)
When disconnecting a connector, do not pull on the
harnesses. Grasp the connector directly and sepa-
rate it.
(3)
Before connecting a connector, check that there are
no deformed, damaged, loose or missing terminals.
(4)
When connecting a connector, press firmly until you
hear the lock close with a ”click” sound.
(5)
If checking a connector with a TOYOTA electrical
tester, check the connector from the backside (har-
ness side) using a mini test lead.
NOTICE:
S
As a waterproof connector cannot be checked from
the backside, check by connecting a sub--harness.
S
Do not damage the terminals by moving the inserted
tester needle.
(c)
CHECKING CONNECTORS
(1)
Checking when a connector is connected:
Squeeze the connector together to confirm that it is
fully connected and locked.
(2)
Checking when a connector is disconnected:
Check by pulling the wire harness lightly from the
backside of the connector. Look for unlatched termi-
nals, missing terminals, loose crimps or broken con-
ductor wires.
Check visually for corrosion, metallic or foreign ob-
jects and water; and bent, rusted, overheated, con-
taminated, and deformed terminals.
NOTICE:
When testing a gold--plated female terminal, always use a
gold--plated male terminal.
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E