Subaru Legacy III (2000-2003 year). Service manual — part 154
EN(H4SO)-228
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AY:DTC P0507 — IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Engine keeps running at higher revolution than specified idling revolution.
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-01134
F44
B61
6
RHD
RHD
20
6
5
19
B21
E2
ECM
2
5
6
3
4
1
3
4
1
2
IDLE
AIR CONTROL
SOLENOID
VALVE
E7
B22
E3
B47
B134
B47
3
4
1
2
5
6
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
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
E7
1
3
4 5 6
2
B21
1 2
3 4
5
6 7
8
9 10
11 12
13
14 15
16
17 18
19 20
SBF-5
BATTERY
MAIN RELAY
1
2
3
5
4
6
1
1 2 3 4
5 6 7 8
F44
LHD
LHD
EN(H4SO)-229
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?
DTC indicated.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0507.
2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
3) Check the following items.
•Loose installation of intake manifold, idle air
control solenoid valve and throttle body
•Cracks of intake manifold gasket, idle air con-
trol solenoid valve gasket and throttle body
gasket
•Disconnections of vacuum hoses
Is there any fault in air intake system?
There is a fault.
Repair air suction
and leaks.
3
CHECK THROTTLE CABLE.
Does throttle cable have play for adjustment?
Cable has play.
Adjust throttle
cable. <Ref. to
SP(H4SO)-10,
Accelerator Con-
trol Cable.>
4
CHECK AIR BY-PASS LINE.
1) Turn ignition switch to OFF.
2) Remove idle air control solenoid valve from
throttle body. <Ref. to FU(H4SO)-34,
REMOVAL, Idle Air Control Solenoid
Valve.>
3) Confirm that there are no foreign particles
in by-pass air line.
Are foreign particles in by-pass air line?
There are foreign particles.
Remove foreign
particles from by-
pass air line.
Replace idle air
control solenoid
valve. <Ref. to
FU(H4SO)-34, Idle
Air Control Sole-
noid Valve.>
EN(H4SO)-230
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AZ:DTC P0512 — STARTER REQUEST CIRCUIT —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Failure of engine to start
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.> .
EN(H4SO)-231
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
Step
Value
Yes
No
1
CHECK OPERATION OF STARTER MOTOR.
NOTE:
Place the inhibitor switch in each position.
Does starter motor operate when ignition
switch to “ON”?
Operates.
Repair battery
short circuit in
starter motor cir-
cuit.
Check starter
motor circuit. <Ref.
to EN(H4SO)-62,
Diagnostics for
Engine Starting
Failure.>
EN-01118
12
INHIBITOR SWITCH
STARTER
MOTOR
7
P
R
N
D
3
2
1
SBF-4
SBF-1
B14
B72
12
11
T7
T3
B12
1
3
IGNITION
SWITCH
AT
MT
AT
MT
T7
1 2 3 4 5 6
7 8 9 10 11 12
B72
3 4
1 2
20
B136
ECM
BATTERY
B12
1 2 3 4
5 6 7 8
9 10 11 12
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
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