SUBARU LEGACY 1996 Service Repair Manual

Condition Probable cause Corrective action
FAULTY CONDENSER
G4M0680
No cooling action;
Engine may overheat.
Suction line is very hot.Condenser is often
found not functioning
well.Check condenser
cooling fan.
Check condenser for
dirt accumulation.
Check engine cooling
system for overheat.
Check for refrigerant
overcharge.
If pressure remains
high in spite of all
above actions taken,
remove and inspect
the condenser for pos-
sible oil clogging.
HIGH-PRESSURE LINE BLOCKED
G4M0681
Insufficient cooling;
Frosted high-pressure
liquid line.Drier is clogged, or
restriction in high-pres-
sure line.1. Discharge system.
2. Remove receiver
drier or strainer and
replace it.
3. Evacuate and charge
system.
FAULTY COMPRESSOR
G4M0682
Insufficient cooling Internal problem is in
compressor, or dam-
aged gasket and valve.1. Discharge system.
2. Remove and check
compressor.
3. Repair or replace
compressor.
4. Check oil level.
5. Replace receiver
drier.
6. Evacuate and charge
system.
44
4-7DIAGNOSTICS
2. Performance Test Diagnosis

3. Blower Motor Diagnosis
45
4-7DIAGNOSTICS
3. Blower Motor Diagnosis

4. Compressor Diagnosis
46
4-7DIAGNOSTICS
4. Compressor Diagnosis

5. Compressor Clutch Diagnosis
Compressor clutch is not engaged.
Check both 10 A fuse for A/C.
Fuse O.K. Fuse blown
Determine cause of blown fuse. Replace faulty part(s)
and fuse.
Does 12 volts exist in control panel connector (R/B)?
Ye s
No
Faulty harness
Does 12 volts exist in control panel connector (B/W)?
Ye s
No
Faulty A/C switch
Does 12 volts exist in dual pressure switch connector
(G/Y)?
Ye s
No
Faulty harness
Does 12 volts exist in dual pressure switch connector
(Br/Y)?
Ye s
No
Faulty dual pressure switch
Does 12 volts exist in A/C relay connector (Br/R) and
(W)?
Ye s
No
Faulty harness
Does 12 volts exist in A/C relay connector (R/W)?
Ye s
No
Does 0 volts exist in A/C relay connector (Br/Y)?
Ye s N o
Faulty A/C relay
To
B
Does 12 volts exist in thermoswitch connector (R/W)?
Ye s
No
Faulty harness
Does 12 volts exist in thermoswitch connector (L/R)?
Ye s
No
Faulty thermoswitch
To
A












47
4-7DIAGNOSTICS
5. Compressor Clutch Diagnosis

A
Does 12 volts exist in A/C cut relay connector (L/Y)
and (Br/R)?
Ye s
No
Faulty harness
Does 12 volts exist in A/C cut relay connector (Y/G)?
Ye s
No
Does 0 volts exist in A/C cut relay connector (G)?
Ye s N o
Faulty A/C cut relay
Check engine control
module.
Does 12 volts exist in compressor connector (Y/G)?
Ye s
No
Faulty harness
Faulty magnet clutch

B
Does 12 volts exist in thermo control amplifier connec-
tor (Br/R)?
Ye s
No
Faulty harness
Does 0 volts exist in thermo control amplifier connec-
tor (R)?
Ye s
No
Faulty harness or blower switch
Does 0 volts exist in thermo control amplifier connec-
tor (W)?
Ye s
No
Faulty thermo control amplifier
Faulty harness









48
4-7DIAGNOSTICS
5. Compressor Clutch Diagnosis

6. Radiator Fan (Main Fan) Diagnosis
EPA0048
49
4-7DIAGNOSTICS
6. Radiator Fan (Main Fan) Diagnosis

7. Condenser Fan (Sub Fan)
Diagnosis (I)
50
4-7DIAGNOSTICS
7. Condenser Fan (Sub Fan) Diagnosis (I)

8. Condenser Fan (Sub Fan)
Diagnosis (II)
51
4-7DIAGNOSTICS
8. Condenser Fan (Sub Fan) Diagnosis (II)

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed on and along body
panels.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuits.

Be careful not to damage Airbag system wiring har-
ness when repairing the body panel.
2. Body Datum Points
Various master repair locations are established as datum
points used during body repairs. In addition, guide holes,
locators and indents are provided to facilitate panel
replacement and achieve alignment accuracy.
NOTE:
Left and right datum points are all symmetrical to each
other.
2
5-1SERVICE DATA
1. Supplemental Restraint System“Airbag”- 2. Body Datum Points

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed on and along body
panels.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuits.

Be careful not to damage Airbag system wiring har-
ness when repairing the body panel.
2. Body Datum Points
Various master repair locations are established as datum
points used during body repairs. In addition, guide holes,
locators and indents are provided to facilitate panel
replacement and achieve alignment accuracy.
NOTE:
Left and right datum points are all symmetrical to each
other.
2
5-1SERVICE DATA
1. Supplemental Restraint System“Airbag”- 2. Body Datum Points