Subaru Legacy 2003 Service Manual page 3821

INSTRUMENTATION/DRIVER INFO
8. CHECK OUTSIDE TEMPERATURE INDICATOR
1 CHECK POWER SUPPLY FOR AMBIENT
SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from ambient sensor.
3) Turn ignition switch ON.
4) Measure voltage between ambient sensor
harness connector terminal and chassis
ground.
Connector & terminal
(F78) No. 2 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
2 CHECK AMBIENT SENSOR.
1) Turn ignition switch OFF.
2) Remove ambient sensor.
3) Check ambient sensor. <Ref. to IDI-22,
INSPECTION, Ambient Sensor.>
Is the ambient sensor OK?
3 CHECK HARNESS BETWEEN AMBIENT
SENSOR AND COMBINATION METER.
1) Disconnect connector from combination
meter.
2) Measure resistance between ambient sen-
sor harness connector terminal and combi-
nation meter harness connector terminal.
Connector & terminal
(F78) No. 1 — (i10) No. 22:
Is the measured value less than the speci-
fied value?
4 CHECK OUTSIDE TEMPERATURE INDICA-
TOR.
1) Connect combination meter harness con-
nector.
2) Connect a resistor (1.7 kΩ) between termi-
nals of ambient sensor harness connector.
3) Turn ignition switch ON and check the out-
side temperature indicator display.
Is the outside temperature indicator indicat-
ing the specified value?
COMBINATION METER SYSTEM
Step Value
4 V
Ambient sensor is OK.
10 Ω
25°C (77°F)
IDI-12
Yes
Go to step 2. Check harness for
open or short
between ambient
sensor and combi-
nation meter.
Go to step 3. Replace the ambi-
ent sensor.
Go to step 4. Repair wiring har-
ness.
Outside tempera- Replace combina-
ture indicator is tion meter printed
OK. circuit.
No