Subaru Legacy III (2000-2003 year). Service manual — part 153
EN(H4SO)-224
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK TRANSMISSION TYPE.
Is the transmission type AT?
Transmission type is AT.
2
CHECK DTC P0720 ON DISPLAY.
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC P0720?
DTC P0720 indicated.
Check front vehi-
cle speed sensor
signal circuit.
<Ref. to AT-58,
DTC 33 FRONT
VEHICLE SPEED
SENSOR, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
3
CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
Does speedometer operate normally?
Operates normally.
Check speedome-
ter and vehicle
speed sensor.
<Ref. to IDI-18,
Speedometer.>
and <Ref. to AT-
54, Front Vehicle
Speed Sensor.>
and <Ref. to AT-
58, Rear Vehicle
Speed Sensor.>
and <Ref. to AT-
59, Torque Con-
verter Turbine
Speed Sensor.>
4
CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from combination
meter.
3) Measure resistance between ECM and
combination meter.
Connector & terminal
(B137) No. 10 — (i10) No. 13:
Is the measured value less than the speci-
fied value?
10
Ω
Repair poor con-
tact in ECM con-
nector.
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and combi-
nation meter con-
nector
• Poor contact in
ECM connector
• Poor contact in
combination meter
connector
• Poor contact in
coupling connector
EN(H4SO)-225
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4SO)-226
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AX:DTC P0506 — IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Engine is difficult to start.
• Engine does not start.
• Erroneous idling
• Engine stalls.
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)-227
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
P0506.
2
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) Remove throttle body from intake manifold.
<Ref. to FU(H4SO)-14, REMOVAL, Throt-
tle Body.>
4) Using an air gun, force air into idle air con-
trol solenoid valve installation area. Confirm
that forced air subsequently escapes from
throttle body interior.
Does air flow out?
Flows out.
Replace idle air
control solenoid
valve. <Ref. to
FU(H4SO)-34,
INSTALLATION,
Idle Air Control
Solenoid Valve.>
Replace throttle
body. <Ref. to
FU(H4SO)-14,
INSTALLATION,
Throttle Body.>
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