
AC-50
General Diagnostic Table
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
29.General Diagnostic Table
A: INSPECTION
Symptom Repair order
Blower motor
Does not operate.
Fuse
Blower motor relay
Blower motor
Blower motor resistor
Blower switch
Wiring harness
Strange noiseBlower motor
Air conditioner filter
Compressor
Does not operate.
Refrigerant
Fuse
Air conditioning relay
Magnet clutch
Compressor
Pressure switch
A/C switch
Blower switch
Wiring harness
Strange noise
V- b e l t
Magnet clutch
Compressor
Belt tensioner
Cold air not emitted.
Refrigerant
V- b e l t
Magnet clutch
Compressor
Pressure switch
Expansion valve
A/C switch
Blower switch
Wiring harness
Heater duct
Heater vent duct
Te m p e r a t u r e c o n t r o l d o o r a c t u a t o r
Wa r m a ir n ot e mi t te d .
Engine coolant
Blower switch
Heater core
Te m p e r a t u r e c o n t r o l d o o r a c t u a t o r
Te m p e r a t u r e o f a i r f r o m v e n t s d o e s n o t c h a n g e .
Engine coolant
Air mix door actuator (Auto A/C)
Wire harness (Auto A/C)
Unable to switch blow vents.
Mode door actuator
Air flow switch
Wiring harness
Unable to switch suction vents.
Air inlet select switch
FRESH/RECIRC door actuator
Wiring harness

EN(H6DO)(diag)-77
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
18.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0011 INTAKE CAMSHAFT POSITION TIMING - OVER-ADVANCED
(BANK 1)
DTC DETECTING CONDITION:
•Detected when two consecutive driving cycles with fault occur.
•GENERAL DESCRIPTION
TROUBLE SYMPTOM:
•Engine stalls.
•Erroneous idling
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Tr o u b l e C o d e
(DTC).”
69, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 2.
2CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Measure the AVCS system operating angle
and oil flow control solenoid valve duty output
using Subaru Select Monitor or general scan
tool.
NOTE:•Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”.
tor.>
•General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the AVCS system operating
angle approx. 0 deg., and oil
flow control solenoid valve duty
output approx. 10%?
Check the follow-
ing item and repair
or replace if nec-
essary.
•Oil pipe (clog)
•Oil flow con-
trol solenoid
valve (clog or
dirt of oil rout-
ing, setting of
spring, clog of
valve)
•Intake cam-
shaft (dirt, dam-
age of
camshaft)
•Timing chain
(matching of
timing mark)
A temporary mal-
function. Perform
the following, and
clean the oil rout-
ing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.

EN(H6DO)(diag)-78
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
B: DTC P0016 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELA-
TION (BANK 1)
DTC DETECTING CONDITION:
•Detected when two consecutive driving cycles with fault occur.
•GENERAL DESCRIPTION
TROUBLE SYMPTOM:
•Engine stalls.
•Erroneous idling
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Tr o u b l e C o d e
(DTC).”
69, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 2.
2CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Measure the AVCS system operating angle
and oil flow control solenoid valve duty output
using Subaru Select Monitor or general scan
tool.
NOTE:•Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”.
tor.>
•General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the AVCS system operating
angle approx. 0 deg., and oil
flow control solenoid valve duty
output approx. 10%?
Check the follow-
ing item and repair
or replace if nec-
essary.
•Oil pipe (clog)
•Oil flow con-
trol solenoid
valve (clog or
dirt of oil rout-
ing, setting of
spring, clog of
valve)
•Intake cam-
shaft (dirt, dam-
age of
camshaft)
•Timing chain
(matching of
timing mark)
A temporary mal-
function. Perform
the following, and
clean the oil rout-
ing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.

EN(H6DO)(diag)-79
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
C: DTC P0018 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELA-
TION (BANK 2)
DTC DETECTING CONDITION:
•Detected when two consecutive driving cycles with fault occur.
•GENERAL DESCRIPTION
TROUBLE SYMPTOM:
•Engine stalls.
•Erroneous idling
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
69, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 2.
2CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Check the AVCS system operating angle
and oil flow control solenoid valve duty output
using Subaru Select Monitor or general scan
tool.
NOTE:
•Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”.
tor.>
•General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the AVCS system operating
angle approx. 0 deg., and oil
flow control solenoid valve duty
output approx. 10%?
Check the follow-
ing item and repair
or replace if nec-
essary.
•Engine oil
(amount, dirt)
•Oil pipe (clog)
•Oil flow con-
trol solenoid
valve (clog or
dirt of oil rout-
ing, setting of
spring, clog of
valve)
•Intake cam-
shaft (dirt, dam-
age of
camshaft)
•Timing chain
(matching of
timing mark)
A temporary mal-
function. Perform
the following, and
clean the oil rout-
ing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.

EN(H6DO)(diag)-80
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
D: DTC P0021 INTAKE CAMSHAFT POSITION TIMING - OVER-ADVANCED
(BANK 2)
DTC DETECTING CONDITION:
•Detected when two consecutive driving cycles with fault occur.
•GENERAL DESCRIPTION
TROUBLE SYMPTOM:
•Engine stalls.
•Erroneous idling
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
69, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 2.
2CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Check the AVCS system operating angle
and oil flow control solenoid valve duty output
using Subaru Select Monitor or general scan
tool.
NOTE:
•Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”.
tor.>
•General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the AVCS system operating
angle approx. 0 deg., and oil
flow control solenoid valve duty
output approx. 10%?
Check the follow-
ing item and repair
or replace if nec-
essary.
•Engine oil
(amount, dirt)
•Oil pipe (clog)
•Oil flow con-
trol solenoid
valve (clog or
dirt of oil rout-
ing, setting of
spring, clog of
valve)
•Intake cam-
shaft (dirt, dam-
age of
camshaft)
•Timing chain
(matching of
timing mark)
A temporary mal-
function. Perform
the following, and
clean the oil rout-
ing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.

EN(H6DO)(diag)-314
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
69, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 2.
2CHECK VENT LINE HOSES.
Check the following item.
•Clogging of vent hoses between canister
and drain valve
•Clogging of vent hose between drain valve
and air filter
•Clogging of drain filter
Is there a fault in vent line? Repair or replace
faulty par ts.
Go to step 3.
3CHECK DRAIN VALVE OPERATION.
1) Turn the ignition switch to OFF.
2) Connect the test mode connector at the
lower portion of instrument panel (on the
driver’s side).
3) Turn the ignition switch to ON.
4) Operate the drain valve.
NOTE:Drain valve operation can also be executed us-
ing Subaru Select Monitor. Refer to “Compulso-
ry Valve Operation Check Mode” for
procedures.
Does the drain valve operate? Contact with SOA
Service Center.
Replace the drain
valve.
Drain Valve.>

FU(H6DO)-51
Fuel System Trouble in General
FUEL INJECTION (FUEL SYSTEMS)
29.Fuel System Trouble in General
A: INSPECTION
NOTE:
•When the vehicle is left unattended for an extended period of time, water may accumulate in the fuel tank.
Fill fuel fully to prevent those problem. And also drain water from fuel filter.
•In snow-covered areas, mountainous areas, skiing areas, etc. where ambient temperatures drop below
0°C (32°F) throughout the winter season, use a water removing agent in the fuel system to prevent freezing
fuel system and accumulating water. Fill the water removing agent at the time when the fuel reduced at half
to maintain the advantage.
•When water is accumulated in fuel filter, drain water from both the fuel filter and fuel tank or use water re-
moving agent in the fuel tank.
•Before using water removing agent, follow the cautions noted on the bottle.
Tr o u b l e a n d p o s s i b l e c a u s e C o r r e c t i v e a c t i o n
1. Insufficient fuel supply to injector
1) Fuel pump does not operate.
Defective terminal contactInspect contact, especially ground, and tighten it
securely.
Tr o u b l e i n e l e c t r o m a g n e t i c o r e l e c t r o n i c c i r c u i t p a r t s R e p l a c e t h e f a u l t y p a r t s .
2) Decline of fuel pump function Replace the fuel pump.
3) Clogged dust or water in the fuel filter Replace the fuel pump and clean or replace the fuel tank.
4) Clogged or bent fuel pipe or hose Clean, correct or replace the fuel pipe or hose.
5) Air is mixed in fuel system. Inspect or retighten each connection part.
6) Clogged or bent air breather hose or pipe Clean, correct or replace the air breather hose or pipe.
7) Damaged diaphragm of pressure regulator Replace the fuel pump.
2. Leakage or blow out of fuel
1) Loose joints of the fuel pipe Retighten.
2) Cracked fuel pipe, hose and fuel tank Replace.
3) Defective welding part on the fuel tank Replace.
4) Defective drain packing of the fuel tank Replace.
5) Clogged or bent air breather hose or air vent tubeClean, correct or replace the air breather hose or air vent
tube.
3. Gasoline smell inside of compartment
1)Loose joints at air breather hose, air vent tube and fuel filler
pipeRetighten.
2) Defective packing air tightness on the fuel saucer Correct or replace the packing.
3) Inoperative fuel pump modulator or circuit Replace.
4. Defective fuel meter indicator
1) Defective operation of fuel level sensor Replace.
2) Defective operation of fuel meter Replace.
5. Noise
1) Large operation noise or vibration of fuel pump Replace.

LU(H6DO)-16
Oil Cooler
LUBRICATION
3) Connect the water hose.
4) Install the water pipe onto engine.
Tightening torque:
6.4 N·m (0.65 kgf-m, 4.7 ft-lb)
5) Refill the engine oil.
6) Fill engine coolant.
MENT, Engine Coolant.>
7) Check the engine oil level.
C: INSPECTION
1) Check that coolant passages are not clogged
using an compressed air.
2) Check that the oil pan upper and O-ring installing
surface of oil filter are not damaged.
LU-00133
LU-00132