Subaru Legacy IV (2008 year). Service manual — part 150
EN(H4SO)(diag)-203
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BH:DTC P0448 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL
CIRCUIT SHORTED
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-119, DTC P0448 EVAPORATIVE EMISSION CONTROL
SYSTEM VENT CONTROL CIRCUIT SHORTED, Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06841
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B136
17
B97
R1
1
2
7
R144
R15
R213
R46
R67
ECM
B136
SBF-7
5
3
6
4
2
1
B47
6
1
E
DRAIN
VALVE
MAIN RELAY
BATTERY
B47
3
4
1
2
5
6
1 2
3
4 5 6 7 8
1
2
3 4 5 6
R67
R213
B97
14
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
1 2
R144
EN(H4SO)(diag)-204
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
DRAIN VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and drain valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 17 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to the power
supply in the har-
ness between the
ECM and drain
valve connector.
Go to step 2.
2
CHECK DRAIN VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between drain valve
terminals.
Terminals
No. 1 — No. 2:
Is the resistance less than 1
:? Replace the drain
valve. <Ref. to
EC(H4SO)-16,
Drain Valve.>
Repair the poor
contact of ECM
connector.
EN(H4SO)(diag)-205
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BI: DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-121, DTC P0451 EVAPORATIVE EMISSION CONTROL
SYSTEM PRESSURE SENSOR, Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-05047
6
17
13
B97
R1
7
6
4
R15
R213
3
2
1
R47
B83
B135 ECM
B97
B83
3 4
5 6
1 2
7 8
B135
5
6
7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26 27
28
16 17 18 19
20 21
29 30 31
32 33
34 35
*
*
*
R47
1 2 3
R213
1 2
3
4 5 6 7 8
22
32
30
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
FUEL TANK
PRESSURE
SENSOR
: TERMINAL No. OPTIONAL
ARRANGEMENT
EN(H4SO)(diag)-206
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FUEL FILLER CAP.
1) Turn the ignition switch to OFF.
2) Open the fuel flap.
Is the fuel filler cap tightened
securely?
Go to step 2.
Tighten fuel filler
cap securely.
2
CHECK PRESSURE VACUUM LINE.
NOTE:
Check the following items.
• Disconnection, leakage and clogging of the
vacuum hoses and pipes between fuel tank
pressure sensor and fuel tank
• Disconnection, leakage and clogging of the
air ventilation hoses and pipes between fuel fill-
er pipe and fuel tank
Is there any fault in pressure/
vacuum line?
Repair or replace
the hoses and
pipes.
Replace the fuel
tank pressure sen-
sor. <Ref. to
EC(H4SO)-12,
Fuel Tank Pres-
sure Sensor.>
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