Mitsubishi 3000GT Workshop Manual Supplement page 18

55-6
HEATER,
AIR
CONDITIONER
AND VENTILATION
-
TTOUbICShOOtiNg
Code No.21 Air thermo sensor system (open circuit) Probable cause
This
diagnosis
code is
outpul
if there is a
delective connector connection,
or
if
there
is an
open circuit
in the
harness.
.
Malfunction of
connector
o
Malfunction of
harness
o
Malfunction of the air thermo
sensor
.
Malfunction of the A/C-ECU
Measure
at the air thermo sensor connector
C-34
I
o
Disconnect
the
connector,
and measure at the hamess
side connector.
I
o
Voltage between terrninal (2) and body
earth
I
OK:5V
Check
the following
connector:
C-97
l*o
OK
Check the following connector:
C-34
Measure
at the
A/C-ECU connector C-97.
.
Connect
the
connector.
.
Voltage between terminal (8)
and body
eadh
OK:
2.3
- 2.9
V
Checkthehamessbetweenthe airthermosensorandtheA/C-ECU.
Check
the lollowing
connector:
C-97
Code No.22 Air thermo sensor system (short circuit) Probable cause
This diagnosis
code is
output
if lhere is a
short circuit
in the air
thermo sensor
input circuit.
.
Mallunction
of
hamess
.
Malfunction of
connecitor
r
Malfunction
of the
air thermo sensor
.
Malfunclion of the
A/C-ECU
Checkthehamess
betweenlheairthermo sensorandthe A/C-ECU.
and
repair
if
necessary.
Measure
at the
A/C-ECU connector C-97.
o
Connect
the
connector.
.
Vollage between terminal (8) and body
earth
OK:
2.3
-
2.9
V