Subaru Legacy III (2000-2003 year). Service manual — part 144

EN(H4SO)-188

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

6

CHECK CAMSHAFT POSITION SENSOR.
1) Remove camshaft position sensor.
2) Measure resistance between connector ter-

minals of camshaft position sensor.

Terminals

No. 1 — No. 2:

Is the measured value within the specified
range?

1 - 4 k

Ω

Go to step 7.

Replace camshaft
position sensor.
<Ref. to
FU(H4SO)-28,
Camshaft Position
Sensor.>

7

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
Turn ignition switch to OFF.
Is the camshaft position sensor installation bolt
tightened securely?

Tightened securely.

Go to step 8.

Tighten camshaft
position sensor
installation bolt
securely.

8

CHECK CAMSHAFT SPROCKET.
Remove front belt cover.
Are camshaft sprocket teeth cracked or dam-
aged?

Cracked or damaged.

Replace camshaft
sprocket. <Ref. to
ME (H4SO)-,
Camshaft
Sprocket.>

Go to step 9.

9

CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn camshaft using ST, and align alignment
mark on camshaft sprocket with alignment
mark on timing belt cover LH.
Is timing belt dislocated from its proper posi-
tion?

Dislocated from proper posi-
tion.

Repair installation
condition of timing
belt. <Ref. to
ME(H4SO)-46,
Timing Belt
Assembly.>

Replace camshaft
position sensor.
<Ref. to
FU(H4SO)-27,
Crankshaft Posi-
tion Sensor.>

Step

Value

Yes

No

EN(H4SO)-189

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

EN(H4SO)-190

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

AM:DTC P0400 — EXHAUST GAS RECIRCULATION FLOW —

• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

• TROUBLE SYMPTOM:

• Poor driving performance on low engine speed
• Erroneous idling
• Poor driving performance.

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:

EN-01129

F44

B61

6

RHD

RHD

BATTERY

SBF-5

B47

MAIN RELAY

1

2

3

5

4

6

F44

1 2 3 4
5 6 7 8

1

6

3

4

1

B22

E3

E58

B328

EGR

SOLENOID

VALVE

2

5

E18

5

6

4

3

ECM

18

17

16

15

B134

B22

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B47

3

4

5

6

1

2

LHD

LHD

E18

B328

1

3

4 5 6

2

B134

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

EN(H4SO)-191

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?

Other DTC indicated on dis-
play.

Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>

Go to step 2.

2

CHECK CURRENT DATA.
1) Start engine.
2) Rear the data of intake manifold absolute

pressure signal using Subaru Select Moni-
tor or OBD-II general scan tool.
Does the measured value exceed the spec-
ified value?

NOTE:

•Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.

53.3 kPa (400 mmHg, 15.75
inHg)

Check if EGR
valve, intake mani-
fold pressure sen-
sor and throttle
body are securely
installed.

Go to step 3.

3

CHECK POWER SUPPLY TO EGR SOLE-
NOID VALVE.
1) Disconnect connector from EGR solenoid

valve.

2) Turn ignition switch to ON.
3) Measure voltage between EGR solenoid

valve and engine ground.

Connector & terminal

(E18) No. 2 — Engine ground:
(E18) No. 5 — Engine ground:

Does the measured value exceed the
specified value?

10 V

Go to step 4.

Repair open circuit
in harness
between main
relay and EGR
solenoid valve
connector.

4

CHECK EGR SOLENOID VALVE.
Measure resistance between EGR solenoid
valve terminals.

NOTE:

Make sure there are no foreign objects caught
between EGR solenoid valve and valve seat.

Terminals

No. 1 — No. 2:
No. 3 — No. 2:
No. 4 — No. 5:
No. 6 — No. 5:

Is the measured value within the specified
range?

20 — 30

Ω

Go to step 5.

Replace EGR
solenoid valve.
<Ref. to
FU(H4SO)-35,
EGR Valve.>