Subaru B9 TRIBECA WX 2007, Manual

Page: 461 / 861

AC(diag)-22
Diagnostics for A/C System Malfunction
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
7 CHECK A/C ON SIGNAL.
1) Turn the ignition switch to OFF.
2) Connect the A/C relay and all disconnected
connectors.
3) Start the engine and turn the AUTO switch
to ON.
4) Turn the temperature control dial at maxi-
mum cool position.
5) Measure the voltage between auto A/C con-
trol module harness connector terminal and
chassis ground.
Connector & terminal
(B283) No. 6 (+) — Chassis ground (–):
Is the voltage more than 10 V? Go to step
9
. Go to step
8
.
8 CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of auto
A/C control module and ECM.
3) Measure the resistance of harness between
auto A/C control module connector and ECM
connector.
Connector & terminal
(B283) No. 6 — (B136) No. 24:
Is the resistance less than 1
Ω
? Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>
Repair the har-
ness.
9 CHECK MAGNET CLUTCH ON SIGNAL.
1) Stop the engine, and turn the AUTO switch
to OFF.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM connec-
tor terminal and chassis ground.
Connector & terminal
(B136) No. 9 (+) — Chassis ground (–):
Is the voltage more than 10 V? Go to step 10 . Check for open or
short circuit in the
harness between
A/C relay and
ECM.
10 CHECK MAGNET CLUTCH ON SIGNAL.
1) Start the engine and turn the AUTO switch
to ON.
2) Turn the temperature control dial at maxi-
mum cool position.
3) Measure the voltage between ECM connec-
tor terminal and chassis ground.
Connector & terminal
(B136) No. 9 (+) — Chassis ground (–):
Is the voltage 0 V? Go to step 11 . Replace the ECM.
<Ref. to
FU(H6DO)-33,
REMOVAL, Engine
Control Module
(ECM).>
11 CHECK POWER SUPPLY FOR MAGNET
CLUTCH.
1) Stop the engine, and turn the AUTO switch
to OFF.
2) Disconnect the harness connector of mag-
net clutch.
3) Start the engine and turn the AUTO switch
to ON.
4) Turn the temperature control dial at maxi-
mum cool position.
5) Measure the voltage between magnet
clutch harness connector terminal and chassis
ground.
Connector & terminal
(F24) No. 1 (+) — Chassis ground (–):
Is the voltage more than 10 V? Go to step 12 . Check for open or
short circuit in the
harness between
A/C relay and mag-
net clutch.
Step Check Yes No
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