Subaru Legacy 2002 Service Manual page 3208

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) (LHD
No.
1 CHECK EVAPORATOR SENSOR.
1) Turn ignition switch to OFF.
2) Remove glove box.
3) Disconnect connector from evaporator sen-
sor.
4) Measure resistance between connector
terminals of evaporator sensor.
Terminals:
No. 1 — No. 3
2 CHECK INPUT SIGNALS FOR EVAPORA-
TOR SENSOR.
1) Turn ignition switch to "ON".
2) Measure voltage between (B88) connector
terminal and chassis ground.
Connector & terminal
(B88) No. 1 (+) — Chassis ground (−):
3 CHECK OUTPUT SIGNALS FROM A/C
CONTROL MODULE.
1) Turn ignition switch to OFF.
2) Pull out A/C control module.
3) Turn ignition switch to "ON".
4) Measure voltage between A/C control mod-
ule connector terminals.
Connector & terminal:
(i49) No. 7 — No. 17
4 CHECK HARNESS CONNECTOR
BETWEEN A/C CONTROL MODULE AND
EVAPORATOR 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 evaporator sensor.
Connector & terminal:
(B88) No. 1 — (i49) No. 7
5 CHECK HARNESS CONNECTOR
BETWEEN A/C CONTROL MODULE AND
EVAPORATOR SENSOR.
Measure resistance of harness between A/C
control module and evaporator sensor.
Connector & terminal:
(B88) No. 3 — (i49) No. 17
6 CHECK POOR CONTACT.
Check poor contact in A/C control module.
MODEL)
Step
Is the resistance approx.
1.8 to 2.0 kΩ at 20°C
(68°F)?
Is the voltage approx. 4.5
V?
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-65
HVAC System (Auto A/C) (Diagnostics)
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Repair poor con-
tact in A/C control
module.
No
Replace evapora-
tor sensor.
Replace evapora-
tor sensor.
Go to step 6.
Repair open cir-
cuit in harness
between A/C con-
trol module and
evaporator sen-
sor.
Repair open cir-
cuit in harness
between A/C con-
trol module and
evaporator sen-
sor.
Contact with your
Subaru distributor
service.