Subaru Legacy III (2000-2003 year). Service manual — part 368
EN(H6DO)-274
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BR:DTC P0661 — INTAKE MANIFOLD TUNING VALVE CONTROL CIRCUIT
LOW - BANK 1 —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-01097
23
B20
E1
1
2
7
4
E30
SBF-5
B137
B20
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
E30
B47
3
4
1
2
5
6
BATTERY
B137
ECM
B47
MAIN RELAY
INDUCTION VALVE
CONTROL SOLENOID
1
2
3
5
4
6
1 2
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
F46
3 4
1 2
B108
F46
2
RHD
LHD
LHD
RHD
EN(H6DO)-275
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK INPUT SIGNAL OF ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 23 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Even if MI lights
up, the circuit has
returned to a nor-
mal condition at
this time. Contact
SUBARU distribu-
tor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
2
CHECK HARNESS BETWEEN INDUCTION
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from induction con-
trol solenoid valve and ECM.
3) Measure resistance of harness between
induction control solenoid valve connector
and engine ground.
Connector & terminal
(E30) No. 2 — Engine ground:
Is the measured value less than the speci-
fied value?
10
Ω
Repair ground
short circuit in har-
ness between
ECM and induc-
tion control sole-
noid valve
connector.
3
CHECK HARNESS BETWEEN INDUCTION
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
Measure resistance of harness between ECM
and induction control solenoid valve of harness
connector.
Connector & terminal
(B137) No. 23 — (E30) No. 2:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between ECM and
induction control
solenoid valve
connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and induc-
tion control sole-
noid valve
connector
• Poor contact in
coupling connector
4
CHECK INDUCTION CONTROL SOLENOID
VALVE.
1) Remove induction control solenoid valve.
2) Measure resistance between induction con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the measured value within the specified
range?
37 — 44
Ω
Replace induction
control solenoid
valve. <Ref. to
FU(H6DO)-38,
Induction Valve
Control Solenoid.>
EN(H6DO)-276
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK POWER SUPPLY TO INDUCTION
CONTROL SOLENOID VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between induction control
solenoid valve and engine ground.
Connector & terminal
(E30) No. 1 (+) — Engine ground (
−−−−
):
Is the measured value within the specified
range?
10 V
Repair open circuit
in harness
between main
relay and induction
control solenoid
valve connector.
6
CHECK POOR CONTACT.
Check poor contact in induction control sole-
noid valve connector.
Is there poor contact in induction control sole-
noid valve connector?
There is poor contact.
Repair poor con-
tact in induction
control solenoid
valve connector.
Contact SUBARU
distributor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
Step
Value
Yes
No
EN(H6DO)-277
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
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