Subaru Legacy III (2000-2003 year). Service manual — part 494
EN(H4DOSTC)-146
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connector from ignition coil
& ignitor assembly.
4) Measure the resistance of harness
between ECM and ignition coil & ignitor
assembly connector.
Connector & terminal
(B136) No. 21 — (E34) No. 1:
(B136) No. 22 — (E33) No. 1:
(B136) No. 23 — (E32) No. 1:
(B136) No. 24 — (E31) No. 1:
Is the measured value less than the speci-
fied value?
1
Ω
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
• Poor contact in
coupling connector
6
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
Measure the resistance of harness between
ECM and engine ground.
Connector & terminal:
(B136) No. 21 — Engine ground:
(B136) No. 22 — Engine ground:
(B136) No. 23 — Engine ground:
(B136) No. 24 — Engine ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair the ground
short circuit in har-
ness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
7
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair the poor
contact in ECM
connector.
Replace the igni-
tion coil and ignitor
assembly.
Step
Value
Yes
No
EN(H4DOSTC)-147
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4DOSTC)-148
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AE:DTC P0444 — EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-
TROL VALVE CIRCUIT OPEN —
• TROUBLE SYMPTOM:
• Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOSTC)-35,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-00945
MAIN RELAY
B47
1
2
3
5
4
6
BATTERY
E
E3
B47
B137
B137
E4
PURGE CONTROL
SOLENOID VALVE
ECM
16
2
1
SBF-5
3
4
1
2
5
6
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
2
1
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B22
E4
1 2
B22
EN(H4DOSTC)-149
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 16 (+) — 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 PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from purge con-
trol solenoid valve and ECM.
3) Measure the resistance of harness
between purge control solenoid valve con-
nector and engine ground.
Connector & terminal
(E4) No. 2 — Engine ground:
Is the measured value less than the speci-
fied value?
10
Ω
Repair the ground
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
3
CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
Measure the resistance of harness between
ECM and purge control solenoid valve of har-
ness connector.
Connector & terminal
(B137) No. 16 — (E4) No. 2:
Is the measured value less than the specified
value?
1
Ω
Repair the open
circuit in harness
between ECM and
purge control sole-
noid valve connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and purge
control solenoid
valve connector
• Poor contact in
coupling connector
4
CHECK PURGE CONTROL SOLENOID
VALVE.
1) Remove the purge control solenoid valve.
2) Measure the resistance between purge
control solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the measured value within the specified
value?
10 — 100
Ω
Replace the purge
control solenoid
valve. <Ref. to
EC(H4DOSTC)-6,
Purge Control
Solenoid Valve.>
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