SUBARU FORESTER 2004 Service Repair Manual

EN(H4SO)-183
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)”. <Ref. to
EN(H4SO)-72, List
of Diagnostic Trou-
ble Code (DTC).>Check radiator fan
and fan motor, and
poor contact in
connectors. <Ref.
to CO(H4SO)-35,
Radiator Main Fan
and Fan Motor.>
<Ref. to
CO(H4SO)-40,
Radiator Sub Fan
and Fan Motor.>

EN(H4SO)-184
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AV:DTC P0502 VEHICLE SPEED SENSOR CIRCUIT LOW INPUT
NOTE:
For the diagnostic procedure, refer to DTC P0503. <Ref. to EN(H4SO)-185, DTC P0503 VEHICLE SPEED
SENSOR CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

EN(H4SO)-185
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AW:DTC P0503 VEHICLE SPEED SENSOR CIRCUIT HIGH INPUT
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
EN-02395
i10
BATTERY
12
10
ECM COMBINATION
METER
VEHICLE
SPEED
SENSOR
3
12
B17
B137
17
TCMB56
IGNITION
RELAY
No. 5
B225
B21
E216
MTATB17
123
B21
123
4
56
78
9
1011 12
1314 15 16B62
B:
B56
1234
10 11 12
19 20 21135614 1578916 17 18
22 23 24
112
B225
10111213
1415161718
1920212223
2425262728
2930313233
3435363738
12
934
56
78
i10
123456789101112131415161718192021222324252627282930
B37
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
F45
B137
4
1
53
2618 15 167891011
17 19
20121314
F45
B38i3
B37i2
18
LHD
LHDRHD
RHD
RHD
RHD
LHDLHD
7B38
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
C:
*
1*
1 LHD MODEL : 9
RHD MODEL : 37*
2 LHD MODEL : 10
RHD MODEL : 38*
12345678910111213141516
B:C:

EN(H4SO)-186
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK TRANSMISSION TYPE.Is the transmission type AT? Go to step 2.Go to step 3.
2 CHECK DTC P0720 ON DISPLAY.Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0720?Check front vehi-
cle speed sensor
signal circuit.
<Ref. to
4AT(H4SO)-45,
DTC 33 FRONT
VEHICLE SPEED
SENSOR, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>Go to step 3.
3 CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.Does speedometer operate
normally?Go to step 4.Check speedome-
ter and vehicle
speed sensor.
<Ref. to IDI-13,
Speedometer.>
<Ref. to 4AT-55,
Front Vehicle
Speed Sensor.>
<Ref. to 4AT-59,
Rear Vehicle
Speed Sensor.>
<Ref. to 4AT-60,
Torque Converter
Turbine Speed
Sensor.>
4 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the combi-
nation meter.
3) Measure the resistance between ECM and
combination meter connector.
Connector & terminal
(B137) No. 10 — (i10) No. 12:Is the resistance less than 10
Ω?Repair the poor
contact in ECM
connector.Repair harness
and connector.
NOTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and combi-
nation meter con-
nector
 Poor contact in
ECM connector.
 Poor contact in
combination meter
connector
 Poor contact in
coupling connector

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 <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
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:

EN(H4SO)-188
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 DTC
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H4SO)-72, List
of Diagnostic Trou-
ble Code (DTC).>
N
OTE:
In this case, it is not
necessary to in-
spect DTC P0506.Go to step 2.
2 CHECK AIR BY-PASS LINE.
1) Turn the ignition switch to OFF.
2) Remove the idle air control solenoid valve
from the throttle body. <Ref. to FU(H4SO)-33,
REMOVAL, Idle Air Control Solenoid Valve.>
3) Remove the throttle body to intake mani-
fold. <Ref. to FU(H4SO)-13, REMOVAL, Throt-
tle Body.>
4) Using an air gun, force air into the idle air
control solenoid valve installation area. Con-
firm that forced air subsequently escapes from
throttle body.Does air flow out? Replace the idle
air control solenoid
valve. <Ref. to
FU(H4SO)-33,
INSTALLATION,
Idle Air Control
Solenoid Valve.>Replace the throt-
tle body. <Ref. to
FU(H4SO)-13,
INSTALLATION,
Throttle Body.>

EN(H4SO)-189
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AY:DTC P0507 IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Engine keeps running at higher revolution than specified idling revolution.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
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:

EN(H4SO)-190
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 DTC
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H4SO)-72, List
of Diagnostic Trou-
ble Code (DTC).>
N
OTE:
In this case, it is not
necessary to in-
spect DTC P0507.Go to step 2.
2 CHECK AIR INTAKE SYSTEM.
1) Turn the ignition switch to ON.
2) Start and idle the engine.
3) Check the following items:
 Loose installation of intake manifold, idle air
control solenoid valve and throttle body
 Cracks of intake manifold gasket, idle air
control solenoid valve gasket and throttle body
gasket
 Disconnections of vacuum hosesIs there any fault in air intake
system?Repair air suction
and leaks.Go to step 3.
3 CHECK THROTTLE CABLE.Is the free play of throttle cable
appropriate?Go to step 4.Adjust throttle
cable. <Ref. to
SP(H4SO)-9,
INSTALLATION,
Accelerator Con-
trol Cable.>
4 CHECK AIR BY-PASS LINE.
1) Turn the ignition switch to OFF.
2) Remove the idle air control solenoid valve
from the throttle body. <Ref. to FU(H4SO)-33,
REMOVAL, Idle Air Control Solenoid Valve.>
3) Confirm that there are no foreign particles
in air by-pass line.Are foreign particles in air by-
pass line?Remove foreign
particles from air
by-pass line.Replace the idle
air control solenoid
valve. <Ref. to
FU(H4SO)-33,
INSTALLATION,
Idle Air Control
Solenoid Valve.>

EN(H4SO)-191
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AZ:DTC P0512 STARTER REQUEST CIRCUIT
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Failure of engine to start
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.

EN(H4SO)-192
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
EN-00261
12INHIBITOR SWITCH
STARTER
MOTOR
7P
RND321
SBF-4SBF-1
B14
B72
12
11
T7T3B12
13
IGNITION
SWITCH
1*2*
1*
2*
T7
123456789101112
B72
34
12
20
B136ECM
: AT MODEL
: MT MODEL1*
2*
BATTERY
B12
123456789101112
B136
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18