Mitsubishi 3000GT 1991, Service Manual

Page: 1136 / 1146

SERVICE DATA
tern
no.
Inspection
point
Method
Criteria
Probable cause
Normal Abnormal
Remedy
11 Room-temper- Measure resistance of
sensor when room ature sensor
perature is 25°C (77°F).
Approx. 4
Largely
from approx.
Defective
Replace
ture sensor ture sensor.
4
Measure voltage across
In approx.
terminal of air
Open-circuited harness
Correct harness.
conditioner control unit
between room-temperature
range
sensor and air
and ground when room
control unit
temperature is 25°C (77°F).
Outside approx.
Poor connection of air Correct connector
conditioner control unit
connection or replace’
range connector or defective air air conditioner control
conditioner control unit unit.
1 3
Measure resistance of Approx. 4 Largely deviates
Defective outside-air Replace
temperature sensor when ambient
from approx. 4 sensor
temperature sensor.
sensor perature is 25°C (77°F).
Measure voltage across
In approx.
terminal air control
harness Correct harness.
between outside-air-
conditioner and range
temperature sensor and
ground when ambient air conditioner control unit
temperature is 25°C (77°F).
Outside approx. Poor connection of air-
Correct connector
conditioner control unit connection or replace
range
connector or defective air conditioner control
air conditioner control unit unit.
15 Water-temper- Measure resistance of Conductive Nonconductive Defective
Replace
ature sensor sensor when water temperature sensor temperature sensor.
temperature is 22.5 to
(57.6 to
21 Air
sensor
Measure voltage across Approx. 12 V
Open-circuited harness Correct harness.
terminal of air
between water-temperature
tioner control unit and
sensor and air conditioner
ground when water control unit
ture is 22.5 to
(57.6 to
Largely deviates Poor connection of air Correct connector
from approx. 12 V conditioner control unit connection or replace
connector or defective air conditioner control
air conditioner control unit unit.
Measure resistance of Approx. 4 Largely deviates Defective air Replace air
sor when sensor’s sensing from approx. 4 sensor sensor.
temperature is 25°C (77°F).
Measure voltage across In approx. Open-circuited harness Correct harness.
of air conditioner 2.3 2.9 V tween air sensor and
control unit and ground range air conditioner control unit
when sensor’s sensing
temperature is 25°C (77°F).
Outside approx.
Poor connection of air Correct connector
conditioner control unit connection or replace
range connector or defective air conditioner control
air conditioner control unit unit.
31 Air Refer to P. 55-59. Defective air mix damper Replace air mix damper
damper potentiometer potentiometer.
potentiometer
Measure voltage across In approx. Open-circuited harness Correct harness.
terminal air
between air damper
conditioner control unit range potentiometer and
and ground when conditioner control
meter is in MAX. COOL
position.
Outside approx. Poor connection of air Correct connector
0.1 conditioner control unit connection or replace
range connector or defective
air conditioner control
air conditioner control unit unit.
33 Outlet Refer to Defective outlet selector Replace outlet selector
selector damper potentiometer damper potentiometer.
damper
potentiometer
Measure voltage across In approx. Open-circuited harness Correct harness.
terminal air 0.1 between outlet selector
conditioner control unit range damper potentiometer
and ground when potentio-
and air conditioner control
meter is in FACE position.
Outside approx. Poor connection of air Correct connector
0.1
conditioner control unit
connection or replace
range connector or defective
air conditioner control
air conditioner control unit
unit.
FULL AUTO AIR CONDITIONER
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