Subaru Legacy 2003 Service Manual page 3544

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) (RHD
Step
1 CHECK SUNLOAD SENSOR.
1) Turn ignition switch to OFF.
2) Remove sunload sensor. <Ref. to AC-48,
REMOVAL, Sunload Sensor (Auto A/C).>
3) Turn ignition switch ON.
4) Measure sunload sensor input voltage.
Connector & terminal
(i51) No. 2 (+) — No. 1 (-):
Is the measured value same as the speci-
fied value?
2 CHECK HARNESS CONNECTOR BETWEEN
A/C CONTROL MODULE AND SUNLOAD
SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from A/C control
module.
3) Measure resistance of harness between A/
C control module and sunload sensor.
Connector & terminal
(i51) No. 1 — (i48) No. 5:
Is the measured value less than the speci-
fied value?
3 CHECK HARNESS CONNECTOR BETWEEN
A/C CONTROL MODULE AND SUNLOAD
SENSOR.
Measure resistance of harness between A/C
control module and sunload sensor.
Connector & terminal
(i51) No. 2 — (i48) No. 4:
Is the measured value less than the specified
value?
4 Check A/C control module input voltage.
1) Connect A/C control module and sunload
sensor connector.
2) Turn ignition switch ON.
3) Measure voltage between A/C control mod-
ule connector terminals.
Connector & terminal
(i48) No. 4 (+) — No. 5 ( − − − − ):
Is the measured value same as the speci-
fied value?
5 CHECK POOR CONTACT.
Check poor contact in A/C control module con-
nector.
Is there poor contact in connector?
MODEL)
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Value
Approx. 4.2 V
1 Ω
1 Ω
Approx. 2.5 V
There is no poor contact.
AC-71
Yes
Go to step 4. Go to step 2.
Go to step 3. Repair harness
between A/C con-
trol module and
sunload sensor.
Go to step 4. Repair harness
between A/C con-
trol module and
sunload sensor.
Go to step 5. Replace sunload
sensor.
Replace A/C con- Repair connector.
trol module.
No