2004 SUBARU FORESTER sensor

EN(H4DOTC)-185
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK CURRENT DATA.
1) Start the engine.
2) Drive the vehicle at the speed of approx. 30
km/h (19 MPH), and then measure the ignition
timing advance angle using Subaru Select
Monitor or OBD-II general scan tool.
N
OTE:
 Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA SHOWN ON DIS-
PLAY FOR ENGINE”. 33, Subaru Select Monitor.>
 OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Does the ignition timing
advance angle changed
smoothly according to engine
output?
Idling: −2 — +2°
Driving: −2 — +50°Repair the poor
contact connector.
N
OTE:
In this case, repair
the following:
 Poor contact of
AVCS camshaft
position sensor
connector.
 Poor contact in
ECM connector.Go to step 2.
2 CHECK HARNESS BETWEEN AVCS CAM-
SHAFT POSITION SENSOR CONNECTOR
AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from AVCS cam-
shaft position sensor connector and ECM.
3) Measure the resistance of harness
between AVCS camshaft position sensor con-
nector and engine ground.
Connector & terminal
(B35) No. 1 — (B135) No. 20:
(B35) No. 2 — (B135) No. 28:Is the resistance less than 1
Ω?Go to step 3.Repair the har-
ness and connec-
tor.
N
OTE:
In this case, repair
the following:
 Open circuit in
harness between
AVCS camshaft
position sensor
connector and
ECM connector
 Poor contact in
ECM connector.
 Poor contact in
coupling connector
3 CHECK HARNESS BETWEEN AVCS CAM-
SHAFT POSITION SENSOR CONNECTOR
AND ECM CONNECTOR.
Measure the resistance of harness between
AVCS camshaft position sensor connector and
engine ground.
Connector & terminal
(E35) No. 1 — Engine ground:
(E35) No. 2 — Engine ground:Is the resistance more than 1
MΩ?Go to step 4.Repair the ground
short circuit in har-
ness between
AVCS camshaft
position sensor
connector and
ECM connector.
NOTE:
The harness be-
tween both con-
nectors are
shielded.Repair
ground short circuit
in harness togeth-
er with shield.
4 CHECK CONDITION OF AVCS CAMSHAFT
POSITION SENSOR CONNECTOR.Is the AVCS camshaft position
sensor connector installation
bolt tightened securely?Go to step 5.Tighten the AVCS
camshaft position
sensor connector
installation bolt
securely.
5 CHECK AVCS CAMSHAFT POSITION SEN-
SOR CONNECTOR.
1) Remove the AVCS camshaft position sen-
sor connector.
2) Measure the resistance between the AVCS
camshaft position sensor connector terminals.
Te r m i n a l s
No. 1 — No. 2:Is the resistance 1 — 4 kΩ? Check for the oil
clogging on oil
pressure routing of
oil flow control
solenoid valve.Replace the AVCS
camshaft position
sensor connector.
FU(H4DOTC)-32,
AVCS Camshaft
Position Sensor.>

EN(H4DOTC)-186
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AW: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 .
WIRING DIAGRAM:
EN-02334
BATTERY
MAIN RELAY
E
6
4
5
3
2
1
2
4
31
FRONT OXYGEN
(A/F) SENSOR
D25
B2
D31
C35
A2
A3
A33
A26
E18
REAR OXYGEN
SENSOR
T6
B47
B47
34
12
56
B134B137
B83
1
23456
B18
B262
34
12
B134A:
B135B:
B136ECM C:
B135
B83 LHD : 5
RHD : 4
LHD : 1
RHD : 1
*1
*2F2 B100
567
82 1
94 310
22 23 11 12 13 14 15
24 25
2616 17
18 19 20 21
27 28 29 30 31
F2
1234 5678910 11 12 13 14 15 16 17 18 19 20567
82 1
94 310
24 22 23 2511 12 13 14 15
26 27
2816 17 18 19
20 21
29 30 31 32 33 34 3556 7
82 1
94 310
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31
B136
56
782 1
94 310
24 22 23 2511 12 13
1415
26 27
2816
17 18 19 20 21
33 34 29
32 30
31 35
B122
12345678
B262T6B1812341234
1
2
31
B18
T5
3
1
4
4
6
B137
D:
14RHD
RHDLHD LHD
2
B122*2*1
B18
T5
RHD
LHD
RHD
LHD

EN(H4DOTC)-192
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AZ: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 .
WIRING DIAGRAM:
B72
R59R58
F60 : LHD
B21 : RHD
i10
B136
i11
1
23456789
10
R15
B136
ECM
i10
B38
B100F2F60E3
E2
B99
R3
i3
EE
E
RHD
RHD
LHD
FUEL
GAUGE
B :
i11 C :
C : B : COMBINATION
METER
B9 B10
C1
3*
*4
R15
R59
FUEL SUB
LEVEL SENSOR
R572
1
2R583
53
FUEL LEVEL
SENSOR
9
B21
16
16 20
3412
1213
4562123
4
56
78
9
1011 12
1314 15 16
F2LHD : 28
RHD : 20
LHD : 16
RHD : 2
*1
*2
LHD : 4
RHD : 3
LHD : 5
RHD : 17*3
*4
EN-02336
3412i3B98B37
B99
56
782 1
94 310
24 22 23 2511 12 13
1415
26 27
2816
17 18 19 20 21
33 34 29
32 30
31 35
1234567891011121314151617181920212223242526272829301234 5678910 11 12 13 14 15 16 17 18 19 20123
45678
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
2534
12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
: LHDB98
: RHD
: LHD
R2
: RHD
1*2*
B37
i223
IGNITION SWITCH
SBF-4SBF-1
B72
14
E
No.14
RHD
B38
i316
LHD
LHD
RHDBATTERY

EN(H4DOTC)-193
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. EN(H4DOTC)-74,
List of Diagnostic
Trouble Code
(DTC).>
N
OTE:
In this case, it is
not necessary to
inspect DTC
P0461.Replace the fuel
level sensor and
fuel sub level sen-
sor. FU(H4DOTC)-64,
Fuel Level Sen-
sor.> FU(H4DOTC)-65,
Fuel Sub Level
Sensor.>

EN(H4DOTC)-194
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BA: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 .
WIRING DIAGRAM:
B72
R59R58
F60 : LHD
B21 : RHD
i10
B136
i11
1
23456789
10
R15
B136
ECM
i10
B38
B100F2F60E3
E2
B99
R3
i3
EE
E
RHD
RHD
LHD
FUEL
GAUGE
B :
i11 C :
C : B : COMBINATION
METER
B9 B10
C1
3*
*4
R15
R59
FUEL SUB
LEVEL SENSOR
R572
1
2R583
53
FUEL LEVEL
SENSOR
9
B21
16
16 20
3412
1213
4562123
4
56
78
9
1011 12
1314 15 16
F2LHD : 28
RHD : 20
LHD : 16
RHD : 2
*1
*2
LHD : 4
RHD : 3
LHD : 5
RHD : 17*3
*4
EN-02336
3412i3B98B37
B99
56
782 1
94 310
24 22 23 2511 12 13
1415
26 27
2816
17 18 19 20 21
33 34 29
32 30
31 35
1234567891011121314151617181920212223242526272829301234 5678910 11 12 13 14 15 16 17 18 19 20123
45678
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
2534
12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
: LHDB98
: RHD
: LHD
R2
: RHD
1*2*
B37
i223
IGNITION SWITCH
SBF-4SBF-1
B72
14
E
No.14
RHD
B38
i316
LHD
LHD
RHDBATTERY

EN(H4DOTC)-195
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SPEEDOMETER AND TACHOME-
TER OPERATION IN COMBINATION
METER.Does the speedometer and
tachometer operate normally?Go to step 2.Repair or replace
the combination
meter. 3, Combination
Meter System.>
2 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.(engine OFF)
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 20 (+) — Chassis ground (
−):Is the voltage less than 0.12
V?Go to step 4.Go to step 3.
3 CHECK INPUT SIGNAL FOR ECM (WITH
SUBARU SELECT MONITOR).
Read the data of fuel level sensor signal using
Subaru Select Monitor.
N
OTE:
 Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA SHOWN ON DIS-
PLAY FOR ENGINE”. 33, Subaru Select Monitor.>Does the voltage change by
shaking the harness and con-
nector of ECM while monitor-
ing the value with Subaru
Select Monitor?Repair the poor
contact in ECM
connector.Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time.A tempo-
rary poor contact
of the connector
may be the cause.
N
OTE:
In this case repair
the following:
 Poor contact in
combination meter
connector
 Poor contact in
ECM connector
 Poor contact in
coupling connector
4 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to OFF.
2) Separate fuel tank cord connector (R57)
and rear wiring harness connector (R15).
3) Turn the ignition switch to ON.
4) Measure the voltage of harness between
ECM connector and chassis ground.
Connector & terminal
(B136) No. 20 (+) — Chassis ground (
−):Is the voltage more than 0.12
V?Go to step 5.Go to step 6.
5 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from connector
(i10), (i11) and ECM connector.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 20 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 7.Repair the ground
short in harness
between ECM and
combination meter
connector.
6 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
Measure the resistance between ECM and
combination meter connector.
Connector & terminal
(B136) No. 20 — (i11) No. 1:Is the resistance less than 10
Ω?Repair or replace
the combination
meter. 3, Combination
Meter System.>Repair open circuit
between ECM and
combination meter
connector.
N
OTE:
In this case repair
the following:
Poor contact in
coupling connector

EN(H4DOTC)-196
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7 CHECK FUEL TANK CORD.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel sub
level sensor.
3) Measure the resistance between fuel sub
level sensor and chassis ground.
Connector & terminal
(R59) No. 1 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 8.Repair ground
short circuit in fuel
tank cord.
8 CHECK FUEL TANK CORD.
1) Disconnect the connector from fuel pump
assembly.
2) Measure the resistance between fuel pump
assembly and chassis ground.
Connector & terminal
(R59) No. 2 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 9.Repair ground
short circuit in fuel
tank cord.
9 CHECK FUEL LEVEL SENSOR.
1) Remove the fuel pump assembly. FU(H4DOTC)-62, Fuel Pump.>
2) Measure the resistance between fuel level
sensor and terminals with its float set to the full
position.
Te r m i n a l s
No. 3 — No. 5:Is the resistance 0.5 — 2.5 Ω? Go to step 10.Replace the fuel
level sensor.
10 CHECK FUEL SUB LEVEL SENSOR.
1) Remove the fuel sub level sensor. FU(H4DOTC)-65, Fuel Sub Level Sensor.>
2) Measure the resistance between fuel sub
level sensor and terminals with its float set to
the full position.
Te r m i n a l s
No. 1 — No. 2:Is the resistance 0.5 — 2.5 Ω? Repair poor con-
tact in harness
between ECM and
combination meter
connector.Replace the fuel
sub level sensor. Step Check Yes No

EN(H4DOTC)-197
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BB: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 .
WIRING DIAGRAM:
B72
R59R58
F60 : LHD
B21 : RHD
i10
B136
i11
1
23456789
10
R15
B136
ECM
i10
B38
B100F2F60E3
E2
B99
R3
i3
EE
E
RHD
RHD
LHD
FUEL
GAUGE
B :
i11 C :
C : B : COMBINATION
METER
B9 B10
C1
3*
*4
R15
R59
FUEL SUB
LEVEL SENSOR
R572
1
2R583
53
FUEL LEVEL
SENSOR
9
B21
16
16 20
3412
1213
4562123
4
56
78
9
1011 12
1314 15 16
F2LHD : 28
RHD : 20
LHD : 16
RHD : 2
*1
*2
LHD : 4
RHD : 3
LHD : 5
RHD : 17*3
*4
EN-02336
3412i3B98B37
B99
56
782 1
94 310
24 22 23 2511 12 13
1415
26 27
2816
17 18 19 20 21
33 34 29
32 30
31 35
1234567891011121314151617181920212223242526272829301234 5678910 11 12 13 14 15 16 17 18 19 20123
45678
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
2534
12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
: LHDB98
: RHD
: LHD
R2
: RHD
1*2*
B37
i223
IGNITION SWITCH
SBF-4SBF-1
B72
14
E
No.14
RHD
B38
i316
LHD
LHD
RHDBATTERY