ECU SUBARU FORESTER 2004 Service Repair Manual

EN(H4SO)-164
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AN:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK
1)
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
 Engine stalls
 Idle mixture is out of specifications.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
EN-02391
B18
T6
3412
56
B47F44
12345678
T5B136
B137 B135
BATTERY
REAR
OXYGEN
SENSORFRONT OXYGEN
(A/F) SENSORMAIN RELAYSBF-5
B61 F44
B47
T6
T5
B19B18 1 2 3 5 6
4
E
7
B122
B19B14D15C43
4
2B23C13C22C6C17
1
8
1
B135ECM
B136 B :
C :
B137 D :
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
4
1
53
2618 15 167891011
17 19
20121314
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
LHD
LHD
RHD
RHD
4
1
B122
LHDLHD
RHDRHD
4
1 23
3
4
21
1234
3412
B122 : LHD
B122 : RHD
123456781234
B :C :
D :

EN(H4SO)-166
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AO:DTC P0458 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-
TROL VALVE CIRCUIT LOW
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 ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
EN-02392
F44B61
PURGE CONTROL
SOLENOID VALVE
E4
B21
E2
B47
B47
34
12
56
B21
123
4
56
78
9
1011 12
1314 15 16
SBF-5
BATTERY
MAIN RELAY
12
35
46
7
29
21
12
B134ECM
F44
12345678
E4
12
B134
1234567891011121314151617181920212223242526272829303132333435
LHDLHD
RHDRHD

EN(H4SO)-169
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AP:DTC P0459 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-
TROL VALVE CIRCUIT HIGH
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 ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
EN-02392
F44B61
PURGE CONTROL
SOLENOID VALVE
E4
B21
E2
B47
B47
34
12
56
B21
123
4
56
78
9
1011 12
1314 15 16
SBF-5
BATTERY
MAIN RELAY
12
35
46
7
29
21
12
B134ECM
F44
12345678
E4
12
B134
1234567891011121314151617181920212223242526272829303132333435
LHDLHD
RHDRHD

EN(H4SO)-170
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to OFF.
2) Connect the test mode connector at the
lower portion of instrument panel (on the
driver’s side).
3) Turn the ignition switch to ON.
4) While operating the purge control solenoid
valve, measure voltage between ECM and
chassis ground.
N
OTE:
Purge control solenoid valve operation can be
executed using Subaru Select Monitor. Refer to
“Compulsory Valve Operation Check Mode” for
procedures. sory Valve Operation Check Mode.>
Connector & terminal
(B134) No. 29 (+) — Chassis ground (
−):Is the voltage 0 — 10 V? Go to step 2.Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair poor
contact in ECM
connector.
2 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. 29 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 4.Go to step 3.
3 CHECK POOR CONTACT.
Check poor contact in ECM connector. Is there poor contact in ECM
connector?Repair the poor
contact in ECM
connector.Replace the ECM.
FU(H4SO)-44,
Engine Control
Module (ECM).>
4 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from purge con-
trol solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 29 (+) — Chassis ground (
−):Is the voltage more than 10 V? Repair battery
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
After repair,
replace the ECM.
FU(H4SO)-44,
Engine Control
Module (ECM).>Go to step 5.
5 CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between purge
control solenoid valve terminals.
Te r m i n a l s
No. 1 — No. 2:Is the resistance less than 1
Ω?Replace the purge
control solenoid
valve EC(H4SO)-9,
Purge Control
Solenoid Valve.>
and ECM. FU(H4SO)-44,
Engine Control
Module (ECM).>Go to step 6.
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.Is there poor contact in ECM
connector?Repair the poor
contact in ECM
connector.Replace the ECM.
FU(H4SO)-44,
Engine Control
Module (ECM).>

EN(H4SO)-171
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AQ:DTC P0461 FUEL LEVEL SENSOR CIRCUIT RANGE/PERFORMANCE
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
R59R58
R57
R15
B38i3
B98R2
B10
C1 B9
25
3
5
i10 B :
i11 C :B135ECM
EE
E
IGNITION
SWITCH
SBF-4SBF-14
COMBINATION
METERSBF-1
B72
14
FUEL SUB
LEVEL SENSOR
FUEL SUB
METER UNIT
FUEL LEVEL
SENSOR1
2
BATTERY
B38
i3
B38
i320E2
B211528
LHD
LHDRHD
RHDLHD
LHDRHD
RHD
2
16
B38i3
LHD
LHDRHD
RHD
4 3
B99R3
B38i3
LHD
LHDRHD
RHD
16
5
B37i2
EN-02393
2
3
B135
B72
R15R59i10R58
3412
13
456212123456789101112131415161718192021222324252627282930
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3
B99
12345678
i11
34 12 8567910
B37
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
B:
C:
B98
123
4
56
78
9
1011 12
1314 15 16
B21

EN(H4SO)-173
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AR:DTC P0462 FUEL LEVEL SENSOR CIRCUIT LOW INPUT
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
R59R58
R57
R15
B38i3
B98R2
B10
C1 B9
25
3
5
i10 B :
i11 C :B135ECM
EE
E
IGNITION
SWITCH
SBF-4SBF-14
COMBINATION
METERSBF-1
B72
14
FUEL SUB
LEVEL SENSOR
FUEL SUB
METER UNIT
FUEL LEVEL
SENSOR1
2
BATTERY
B38
i3
B38
i320E2
B211528
LHD
LHDRHD
RHDLHD
LHDRHD
RHD
2
16
B38i3
LHD
LHDRHD
RHD
4 3
B99R3
B38i3
LHD
LHDRHD
RHD
16
5
B37i2
EN-02393
2
3
B135
B72
R15R59i10R58
3412
13
456212123456789101112131415161718192021222324252627282930
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3
B99
12345678
i11
34 12 8567910
B37
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
B:
C:
B98
123
4
56
78
9
1011 12
1314 15 16
B21

EN(H4SO)-176
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AS:DTC P0463 FUEL LEVEL SENSOR CIRCUIT HIGH INPUT
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
R59R58
R57
R15
B38i3
B98R2
B10
C1 B9
25
3
5
i10 B :
i11 C :B135ECM
EE
E
IGNITION
SWITCH
SBF-4SBF-14
COMBINATION
METERSBF-1
B72
14
FUEL SUB
LEVEL SENSOR
FUEL SUB
METER UNIT
FUEL LEVEL
SENSOR1
2
BATTERY
B38
i3
B38
i320E2
B211528
LHD
LHDRHD
RHDLHD
LHDRHD
RHD
2
16
B38i3
LHD
LHDRHD
RHD
4 3
B99R3
B38i3
LHD
LHDRHD
RHD
16
5
B37i2
EN-02393
2
3
B135
B72
R15R59i10R58
3412
13
456212123456789101112131415161718192021222324252627282930
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3
B99
12345678
i11
34 12 8567910
B37
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
B:
C:
B98
123
4
56
78
9
1011 12
1314 15 16
B21

EN(H4SO)-179
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AT:DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
R59R58
R57
R15
B38i3
B98R2
B10
C1 B9
25
3
5
i10 B :
i11 C :B135ECM
EE
E
IGNITION
SWITCH
SBF-4SBF-14
COMBINATION
METERSBF-1
B72
14
FUEL SUB
LEVEL SENSOR
FUEL SUB
METER UNIT
FUEL LEVEL
SENSOR1
2
BATTERY
B38
i3
B38
i320E2
B211528
LHD
LHDRHD
RHDLHD
LHDRHD
RHD
2
16
B38i3
LHD
LHDRHD
RHD
4 3
B99R3
B38i3
LHD
LHDRHD
RHD
16
5
B37i2
EN-02393
2
3
B135
B72
R15R59i10R58
3412
13
456212123456789101112131415161718192021222324252627282930
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3
B99
12345678
i11
34 12 8567910
B37
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
B:
C:
B98
123
4
56
78
9
1011 12
1314 15 16
B21

EN(H4SO)-181
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AU:DTC P0483 COOLING FAN RATIONALITY CHECK
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
 Occurrence of noise
 Over-heating
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
NOTE:
If the vehicle, with the engine idling, is placed very close to a wall or another vehicle, preventing normal cool-
ing function, the OBD system may detect malfunction.

EN(H4SO)-187
ENGINE (DIAGNOSTIC)
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 ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
EN-02396
B137
B135
B134
B21
123
4
56
78
9
1011 12
1314 15 16
EE
B47
E7
2 5
1 4 3 6
B21B61F44
E2
B22
E3
B21
E2
6
4
5
3
2
1
1
2 A6 A20 A19A5
B21 D14A74
1 3
15
16
SBF-5BATTERY MEIN RELAY
IDLE
AIR CONTROL
SOLENOID
VALVE
A:
B134
B:
B135
D:
B137ECM
B47
F44
E7
3412
56
13
4562
B22
125678
131415169101112
34
17181920
7
12345678
4
1
53
2618 15 167891011
17 19
20121314
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
1234567891011121314151617181920212223242526272829303132333435
LHDLHD
RHDRHD
A: B:
D: