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Troubleshooting
Evaporator Temperature Sensor
Recirculation indicator light
indicates
Diagnostic Trouble Code (OTC) 3: A problem
in
the
evaporator temperature
sensor
circuit.
The
evaporator
temperature sensor
is a
temperature
dependent
resistor (thermistor). The resistance
of
the thermistor
decreases
as
the evaporator outlet air temperature increases.
Self-diagnosis circuit check indi-
cates a problem in the evapora-
tor temperature sensor circuit.
Check the evaporator tempera-
ture
senior:
1.
Dis
co
nnect the evaporator
temperature
sensor
2P
co
n-
nector.
2.
Measure
the
resistance
between
the No.
,
and
No.2
terminals of the
ev
aporator
temperature
sensor.
Is
the
resista
nce
within
the
speci-
NO
fications shown on the
graph.
YES
Check for a short
in the
wire:
1.
Remove the heater
control
panel
(see
page
22-46).
2.
Check for continuity
between
the No.2 terminal
of
the
heater control
panel 20P
con-
nector and body ground
.
"-
YES
Is
there
continuity?
/'
I
NO
To page
22-21
22-20
RE
kD
Replace the
evaporator tempera-
tur.
HMor.
n
-=-
Repair short in the wire betwHn
the heater control panel and the
evaporator tempera-tur. sensOf.
EVAPORATOR TEMPERATURE SENSOR
Terminal side
of
male terminals
30
SISTANCE
20
10
n-
~
~.
.
r--..
I
50
10
68
20
--
86'
F
30'
C
HEATER CONTROL PANEL lOP CONNECTOR
6
8
9
10
11 12
13 14 15 16
17 18 19 20
Wire side of female terminals
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Table of Contents
Troubleshooting
