Subaru Legacy 2002 Service Manual page 3211

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) (LHD
HVAC System (Auto A/C) (Diagnostics)
No.
1 CHECK SUNLOAD SENSOR.
1) Turn ignition switch to OFF.
2) Remove sunload sensor. <Ref. to AC-48,
REMOVAL, Sun-load Sensor (Auto A/C).>
3) Measure resistance between sunload sen-
sor terminals.
Terminals:
No. 2 — No. 1
2 CHECK SUNLOAD SENSOR.
Make sure that there is no resistance in the
reverse side terminals.
Terminals:
No. 1 — No. 2
3 CHECK INPUT VOLTAGE TO SUNLOAD
SENSOR.
1) Turn ignition switch to ON.
2) Measure input voltage to sunload sensor.
Connector & terminal:
(i51) No. 2 — No. 1
4 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. 2 — (i49) No. 16
5 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. 1 — (i49) No. 17
6 CHECK POOR CONTACT.
Check poor contact in A/C control module.
MODEL)
Step
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the voltage approx. 4.5
V?
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Is there poor contact in A/C
control module?
AC-68
Check Yes
Go to step 2.
Go to step 3.
Go to step 6.
Go to step 5.
Go to step 6.
Repair poor con-
tact in A/C control
module.
No
Replace sunload
sensor.
Replace sunload
sensor.
Go to step 4.
Repair open cir-
cuit in harness
between A/C con-
trol module and
sunload sensor.
Repair open cir-
cuit in harness
between A/C con-
trol module and
sunload sensor.
Contact with your
Subaru distributor
service.