engine SUBARU FORESTER 2004 Service Repair Manual

EN(H4DOTC)-155
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
5 CHECK HARNESS BETWEEN FUEL PUMP
CONTROL UNIT AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance in harness
between fuel pump control unit and ECM con-
nector.
Connector & terminal
(R122) No. 8 — (B135) No. 27:
(R122) No. 9 — (B137) No. 28:Is the resistance less than 1
Ω?Go to step 6.Repair the har-
ness and connec-
tor.
N
OTE:
In this case repair
the following:
 Open circuit
between fuel pump
control unit and
ECM.
 Poor contact in
fuel pump control
unit and ECM con-
nector
6 CHECK HARNESS BETWEEN FUEL PUMP
CONTROL UNIT AND ECM CONNECTOR.
Measure the resistance of harness between
fuel pump control unit and chassis ground.
Connector & terminal
(R122) No. 8 — Chassis ground:
(R122) No. 9 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 7.Repair the ground
short circuit
between fuel pump
control unit and
ECM.
7 CHECK POOR CONTACT.
Check poor contact in ECM and fuel pump
control unit connector.Is there poor contact in ECM
and fuel pump control unit con-
nector?Repair the poor
contact in ECM
and fuel pump
control unit.Go to step 8.
8 CHECK EXPERIENCE OF OUT OF GAS.Have the vehicle been out of
gas before?Complete the
diagnosis.
N
OTE:
DTC may be re-
corded due to the
idle running of fuel
pump at out of gas.Replace the fuel
pump control unit.
FU(H4DOTC)-53,
Fuel Pump Control
Unit.> Step Check Yes No

EN(H4DOTC)-156
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AH:DTC P0244 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A”
RANGE/PERFORMANCE
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
 Erroneous idling
 Engine stalls.
 Poor driving performance
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode .
WIRING DIAGRAM:
EN-02328
MAIN RELAY
B47 1 2 3 5 4 6
BATTERY
E
B61F44
F44
B47
B134
B127
B134
B127
WASTGATE
CONTROL SOLENOID
VALVEECM
32 1 2
7LHD
RHD
LHD
RHDSBF-5
12345678
3412
56
12
56 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

EN(H4DOTC)-157
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
P0244.Replace the
wastegate control
solenoid valve.
FU(H4DOTC)-44,
Wastegate Con-
trol Solenoid Valve
Assembly.>

EN(H4DOTC)-158
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AI: DTC P0245 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” LOW
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode .
WIRING DIAGRAM:
EN-02328
MAIN RELAY
B47 1 2 3 5 4 6
BATTERY
E
B61F44
F44
B47
B134
B127
B134
B127
WASTGATE
CONTROL SOLENOID
VALVEECM
32 1 2
7LHD
RHD
LHD
RHDSBF-5
12345678
3412
56
12
56 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

EN(H4DOTC)-159
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 ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 32 (+) — Chassis ground (
−):Is the voltage more than 10 V? Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time.Go to step 2.
2 CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from wastegate
control solenoid valve and ECM.
3) Measure the resistance in harness
between wastegate control solenoid valve con-
nector and engine ground.
Connector & terminal
(B127) No. 1 — Engine ground:Is the resistance less than 10
Ω?Repair ground
short circuit in har-
ness between
ECM and waste-
gate control sole-
noid valve
connector.Go to step 3.
3 CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
Measure the resistance of harness between
wastegate control solenoid valve and ECM.
Connector & terminal
(B134) No. 32 — (B127) No. 1:Is the resistance less than 1
Ω?Go to step 4.Repair open circuit
in harness
between ECM and
wastegate control
solenoid valve
connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and waste-
gate control sole-
noid valve
connector
4 CHECK WASTEGATE CONTROL SOLE-
NOID VALVE.
1) Remove the wastegate control solenoid
valve.
2) Measure the resistance between wastegate
control solenoid valve terminals.
Te r m i n a l s
No. 1 — No. 2:Is the resistance 30 — 34 Ω? Go to step 5.Replace the
wastegate control
solenoid valve.
FU(H4DOTC)-44,
Wastegate Con-
trol Solenoid Valve
Assembly.>
5 CHECK POWER SUPPLY TO WASTEGATE
CONTROL SOLENOID VALVE.
1) Turn the ignition switch to ON.
2) Measure the voltage between wastegate
control solenoid valve and engine ground.
Connector & terminal
(B127) No. 2 (+) — Engine ground (
−):Is the voltage more than 10 V? Go to step 6.Repair open circuit
in harness
between main
relay and waste-
gate control sole-
noid valve
connector.
6 CHECK POOR CONTACT.
Check poor contact in wastegate control sole-
noid valve connector.Is there poor contact in waste-
gate control solenoid valve
connector?Repair poor con-
tact in wastegate
control solenoid
valve connector.Contact the SUB-
ARU dealer.
N
OTE:
Inspection by DTM
is required, because
probable cause is
deterioration of mul-
tiple parts.

EN(H4DOTC)-160
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AJ:DTC P0246 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” HIGH
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode .
WIRING DIAGRAM:
EN-02328
MAIN RELAY
B47 1 2 3 5 4 6
BATTERY
E
B61F44
F44
B47
B134
B127
B134
B127
WASTGATE
CONTROL SOLENOID
VALVEECM
32 1 2
7LHD
RHD
LHD
RHDSBF-5
12345678
3412
56
12
56 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

EN(H4DOTC)-161
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 ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 32 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 3.Go to step 2.
2 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(H4DOTC)-50,
Engine Control
Module (ECM).>
3 CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from wastegate
control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 32 (+) — Chassis ground (
−):Is the voltage more than 10 V? Repair battery
short circuit in har-
ness between
ECM and waste-
gate control sole-
noid valve
connector.After
repair, replace the
ECM. FU(H4DOTC)-50,
Engine Control
Module (ECM).>Go to step 4.
4 CHECK WASTEGATE CONTROL SOLE-
NOID VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between wastegate
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
wastegate control
solenoid valve and
ECM. FU(H4DOTC)-44,
Wastegate Con-
trol Solenoid Valve
Assembly.> to FU(H4DOTC)-
50, Engine Con-
trol Module
(ECM).>Go to step 5.
5 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(H4DOTC)-50,
Engine Control
Module (ECM).>

EN(H4DOTC)-162
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AK:DTC P0301 CYLINDER 1 MISFIRE DETECTED
NOTE:
For the diagnostic procedure, refer to DTC P0304. MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
AL:DTC P0302 CYLINDER 2 MISFIRE DETECTED
NOTE:
For the diagnostic procedure, refer to DTC P0304. MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
AM:DTC P0303 CYLINDER 3 MISFIRE DETECTED
NOTE:
For the diagnostic procedure, refer to DTC P0304. MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

EN(H4DOTC)-163
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AN:DTC P0304 CYLINDER 4 MISFIRE DETECTED
DTC DETECTING CONDITION:
 Two consecutive driving cycles with fault
 Immediately at fault recognition (A misfire which could damage catalyst occurs.)
TROUBLE SYMPTOM:
 Engine stalls.
 Erroneous idling
 Rough driving
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode .

EN(H4DOTC)-164
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
LHD model
EN-02318
BATTERY
FUEL INJECTORS MAIN RELAY
E#4
1 2
SBF-5
#3
1
2
#2
1
2
F60
#1
1 2
1
9
10
11
12
6
7
8
9
6
5
4
3
1
7
12123
4
56
78
9
1011 12
1314 15 16
6
4
5
3
2
1
F60
F74
B136F74
B200
E5
E5
E3
E6
E6
E16
E16
E17
F44
F2
B100
B47
B61F44
E17
12345678
F2B47
34
12
56
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 3534 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
1234 5678910 11 12 13 14 15 16 17 18 19 20
B136
ECM