Wt
SYMPTOM SIMULATIO
N
VIBRATION METHOD
(cont'd)
:
When vibration seems to be the major cause
.
WIRE HARNES
S
Gently wiggle the wire harness vertically an
d
~ r
horizontally
. Connector joints and places where wir
e
harnesses pass through the body are the major area
s
to be checked
.
Gently wiggl
e
Gently tap
PARTS AND SENSOR
S
Gently tap the part or sensor in question with you
r
finger
.
NOTE
R
b
h
l i
:
emem
er t
at app
y
ng too much shock to
a
J~~ JJ l
relay may cause it to open, making it appear that it i
s
the relay that is at fault when there is really nothin
g
wrong with it at all
.
:
:2]
HEAT
METHOD
: When the malfunction seems to occur when the suspec
t
area is heated
.
Using a hair dryer, heat the component that is th
e
likely cause of the malfunction
.
Malfunc
-
tions
NOTICE
:
D
h
°
C
•
o
not
eat any component to more than 6
0
(140°F) (
temperature limit at which the componen
t
can
be safely touched with the hand)
.
• Never open an ECU and apply heat directly to th
e
pa
rt
s inside it
.
3
WATER SPRAY
METHOD
: When the malfunction seems to occur on a rain
y
day or under conditions of high humidity
.
Change the temperature and ambient humidity b
y
spraying water onto the vehicle
.
NOTICE
:
• Never spray water directly into the engin
e
compartment
; spray it onto the front of the radiato
r
through
the grill
.
• Never let
water come in direct contact wit
h
electronic components
.
NOTE
:
• If a vehicle is subject to
water leakage,
the leakin
g
water may get into an ECU . When testing a vehicl
e
with a water leakage problem, special caution mus
t
be used
.
164
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