Subaru Legacy IV (2008 year). Service manual — part 317

EN(H4DOTC)(diag)-89

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

20.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC P0011 INTAKE CAMSHAFT POSITION - TIMING OVER-ADVANCED OR

SYSTEM PERFORMANCE (BANK 1)

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-10, DTC P0011 INTAKE CAMSHAFT POSITION -
TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Improper idling

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.

Step

Check

Yes

No

1

CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Measure the AVCS system operating angle
using the Subaru Select Monitor or general
scan tool.

NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.

Is the AVCS system operating
angle approx. 0°?

Go to step 2.

Check the follow-
ing item and repair
or replace if neces-
sary.
• Oil pipe (clog)
• Oil flow control
solenoid valve
(clogged or dirty oil
passages, spring
settings)
• Intake camshaft
(dirt, damage of
camshaft)

2

CHECK CURRENT DATA.
1) Drive with acceleration and deceleration at
80 km/h (50 MPH) or less.

NOTE:
Drive to an extent that the duty output of oil flow
control solenoid valve increases.
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 procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.

When the oil flow control sole-
noid valve duty output exceeds
10%, is the AVCS system oper-
ating angle approx. 0°?

Check the follow-
ing item and repair
or replace if neces-
sary.
• Oil pipe (clog)
• Oil flow control
solenoid valve
(clogged or dirty oil
passages, spring
settings)
• Intake camshaft
(dirt, damage of
camshaft)

Perform the follow-
ing procedures,
and clean the oil
routing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.
<Ref. to
LU(H4SO)-10,
REPLACEMENT,
Engine Oil.> <Ref.
to LU(H4SO)-23,
Engine Oil Filter.>

EN(H4DOTC)(diag)-90

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

B: DTC P0016 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION

(BANK1)

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-12, DTC P0016 CRANKSHAFT POSITION - CAM-
SHAFT POSITION CORRELATION (BANK1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Improper idling

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.

Step

Check

Yes

No

1

CHECK 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 procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.

Is the AVCS system operating
angle approx. 0°, and oil flow
control solenoid valve duty out-
put approx. 10%?

Perform the follow-
ing procedures,
and clean the oil
routing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.
<Ref. to
LU(H4SO)-10,
REPLACEMENT,
Engine Oil.> <Ref.
to LU(H4SO)-23,
Engine Oil Filter.>

Check the follow-
ing item and repair
or replace if neces-
sary.
• Oil pipe (clog)
• Oil flow control
solenoid valve
(clogged or dirty oil
passages, spring
settings)
• Intake camshaft
(dirt, damage of
camshaft)
• Timing belt
(matching of timing
mark)

EN(H4DOTC)(diag)-91

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

C: DTC P0018 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION

(BANK2)

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-13, DTC P0018 CRANKSHAFT POSITION - CAM-
SHAFT POSITION CORRELATION (BANK2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Improper idling

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.

Step

Check

Yes

No

1

CHECK 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 procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.

Is the AVCS system operating
angle approx. 0°, and oil flow
control solenoid valve duty out-
put approx. 10%?

Perform the follow-
ing procedures,
and clean the oil
routing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.
<Ref. to
LU(H4SO)-10,
REPLACEMENT,
Engine Oil.> <Ref.
to LU(H4SO)-23,
Engine Oil Filter.>

Check the follow-
ing item and repair
or replace if neces-
sary.
• Oil pipe (clog)
• Oil flow control
solenoid valve
(clogged or dirty oil
passages, spring
settings)
• Intake camshaft
(dirt, damage of
camshaft)
• Timing belt
(matching of timing
mark)

EN(H4DOTC)(diag)-92

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

D: DTC P0021 INTAKE CAMSHAFT POSITION - TIMING OVER-ADVANCED OR

SYSTEM PERFORMANCE (BANK 2)

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-13, DTC P0021 INTAKE CAMSHAFT POSITION -
TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 2), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Improper idling

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.

Step

Check

Yes

No

1

CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Measure the AVCS system operating angle
using the Subaru Select Monitor or general
scan tool.

NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.

Is the AVCS system operating
angle approx. 0°?

Go to step 2.

Check the follow-
ing item and repair
or replace if neces-
sary.
• Oil pipe (clog)
• Oil flow control
solenoid valve
(clogged or dirty oil
passages, spring
settings)
• Intake camshaft
(dirt, damage of
camshaft)

2

CHECK CURRENT DATA.
1) Drive with acceleration and deceleration at
80 km/h (50 MPH) or less.

NOTE:
Drive to an extent that the duty output of oil flow
control solenoid valve increases.
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 procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.

When the oil flow control sole-
noid valve duty output exceeds
10%, is the AVCS system oper-
ating angle approx. 0°?

Check the follow-
ing item and repair
or replace if neces-
sary.
• Oil pipe (clog)
• Oil flow control
solenoid valve
(clogged or dirty oil
passages, spring
settings)
• Intake camshaft
(dirt, damage of
camshaft)

Perform the follow-
ing procedures,
and clean the oil
routing.
Replace the
engine oil and idle
the engine for 5
minutes, and then
replace the oil filter
and engine oil.
<Ref. to
LU(H4SO)-10,
REPLACEMENT,
Engine Oil.> <Ref.
to LU(H4SO)-23,
Engine Oil Filter.>