Mitsubishi Stealth 1994 Import Service Manual page 1250

24-58
FULL AUTO AIR CONDITIONING - Troubleshooting
SERVICE DATA
Inspection
no. point
11 Interior
Measure resistance of
temperature sensor when room tem-
sensor perature is 25°C (77°F).
Measure voltage across
terminal @ of air
conditioning control unit
and ground when interior
temperature is 25°C (77°F).
13 Air inlet Measure resistance of
sensor sensor when ambient tem-
perature is 25°C (77°F).
Measure voltage across
terminal @of air control
conditioning unit and
ground when ambient
temperature is 25°C (77°F).
15 Engine Measure resistance of
coolant tempe- sensor when engine coolant
rature sensor temperature is 22.5 to
Measure voltage across
terminal @of air condi-
tioning control unit and
ground when engine coolant
temperature is 22.5 to
21 Air therm0 Measure resistance of
sensor
sensor when sensor's
sensing temperature is 25°C
(77°F).
Measure voltage across
terminal @J of air condi-
tioning control unit and
ground when sensor's sens-
ing temperature is 25°C
(77°F).
Method
Normal
Approx. 4 kfi
In approx.
range
Approx. 4 kfi
In approx.
range
Conductive
Approx. 12 V
to 66.9"F).
Approx. 4 kfi
In approx.
range
Criteria
Probable cause
Abnormal
Largely deviates Defective interior
temperature sensor
Open-circuited harness
between interior
temperature sensor
and air conditioning
control unit
Outside approx. Poor connection of
air conditioning control
range unit connector or
defective air conditioning
control unit
Largely deviates Defective air inlet
from approx. 4 kfi sensor
Open-circuited harness
between air inlet
sensor and air
conditioning control unit
Outside approx. Poor connection of air-
conditioning control unit
range
connector or defective
air conditioning control unit
Nonconductive Defective engine coolant
temperature sensor
Open-circuited harness
between engine coolant
temperature sensor and
air conditioning control unit
Largely deviates Poor connection of air
from approx. 12 V conditioning control unit
connector or defective
air conditioning control unit
Largely deviates Defective air therm0
sensor
from approx. 4 kfl
Open-circuited harness
between air therm0
sensor and air conditioning
control unit
Outside approx. Poor connection of air
range
air conditioning control unit
Remedy
Replace interior
temperature sensor.
Correct harness.
Correct connector
connection or replace
air conditioning control
unit.
Replace air inlet
sensor.
Correct harness.
Correct connector
connection or replace
air conditioning control
unit.
Replace engine coolant
temperature sensor.
Correct harness.
Correct connector
connection or replace
air conditioning control
unit.
Replace air therm0
sensor.
Correct harness.
Correct connector
connection or replace
air conditioning control
unit.