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