Subaru Legacy 2004 Service Manual page 3449

Step
1 CHECK POWER SUPPLY VOLTAGE FOR
SUNLOAD SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from sunload
sensor.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage for sun-
load sensor.
Connector & terminal
(i51) No. 1 (+) — No. 2 (
2 CHECK HARNESS CONNECTOR BETWEEN
AUTO A/C CONTROL MODULE AND SUN-
LOAD SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from auto A/C
control module.
3) Measure the resistance in harness
between auto A/C control module and sunload
sensor.
Connector & terminal
(i51) No. 2 — (B282) No. 6:
3 CHECK HARNESS CONNECTOR BETWEEN
AUTO A/C CONTROL MODULE AND SUN-
LOAD SENSOR.
Measure the resistance in harness between
auto A/C control module and sunload sensor.
Connector & terminal
(i51) No. 1 — (B282) No. 8:
4 CHECK INPUT VOLTAGE FOR AUTO A/C
CONTROL MODULE.
1) Connect the connectors of sunload sensor
and auto A/C control module.
2) Turn the ignition switch to ON.
3) Measure the voltage between connector
terminals of auto A/C control module.
Connector & terminal
(B282) No. 8 (+) — (B282) No. 6 (
5 CHECK POOR CONTACT.
Check poor contact in auto A/C control module
connector.
Diagnostic Procedure for Sensors
Is the voltage approx. 5 V?
$
):
Is the resistance less than 1
#?
Is the resistance less than 1
#?
Is the voltage approx. 2.5 V?
$
):
Is there poor contact in con-
nector?
AC(diag)-37
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Check Yes
Go to step 4.
Go to step 3.
Go to step 4.
Go to step 5.
Repair the con-
nector.
No
Go to step 2.
Repair the har-
ness between auto
A/C control mod-
ule and sunload
sensor.
Repair the har-
ness between auto
A/C control mod-
ule and sunload
sensor.
Replace the sun-
load sensor.
Replace the auto
A/C control mod-
ule.