2004 SUBARU FORESTER Service Repair Manual

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Page 1785 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-152
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AG:DTC P0230 FUEL PUMP PRIMARY CIRCUIT
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
Aft

Page 1786 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-153
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
RHD model
EN-02317
B97
B135B137
R122
EE
M
10 7
6
FUEL PUMP
RELAY
FUEL PUMP
CONTROL MODULE
FUEL
PUMP
SBF-5

Page 1787 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-154
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK POWER SUPPLY CIRCUIT TO FUEL
PUMP CONTROL UNIT.
1) Turn the ignition switch to OFF

EN(H4DOTC)-154
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK POWER SUPPLY CIRCUIT TO FUEL
PUMP CONTROL UNIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel pump
control unit.
3) Turn the ignition switch to ON.
4) Measure the voltage between fuel pump
control unit and chassis ground.
Connector & terminal
(R122) No. 10 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 2.Repair the power
supply circuit.
N
OTE:
In this case repair
the following:
Open or ground
short circuit in har-
ness between fuel
pump relay and
fuel pump control
unit.
Poor contact in
fuel pump control
unit connector.
Poor contact in
fuel pump relay
connector.
2 CHECK GROUND CIRCUIT OF FUEL PUMP
CONTROL UNIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between fuel pump control unit and chassis
ground.
Connector & terminal
(R122) No. 5 — Chassis ground:Is the resistance less than 5
Ω?Go to step 3.Repair the har-
ness and connec-
tor.
N
OTE:
In this case repair
the following:
Open circuit
between fuel pump
control unit and
chassis ground.
Poor contact in
fuel pump control
unit connector.
3 CHECK HARNESS BETWEEN FUEL PUMP
CONTROL UNIT AND FUEL PUMP CONNEC-
TOR.
1) Disconnect the connector from fuel pump.
2) Measure the resistance of harness
between fuel pump control unit and fuel pump
connector.
Connector & terminal
(R122) No. 7 — (R58) No. 1:
(R122) No. 6 — (R58) No. 4:Is the resistance less than 1
Ω?Go to step 4.Repair open circuit
between fuel pump
control unit and
fuel pump.
4 CHECK HARNESS BETWEEN FUEL PUMP
CONTROL UNIT AND FUEL PUMP CONNEC-
TOR.
Measure the resistance of harness between
fuel pump control unit and chassis ground.
Connector & terminal
(R122) No. 7 — Chassis ground:
(R122) No. 6 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 5.Repair ground
short circuit
between fuel pump
control unit and
fuel pump.

Page 1788 of 2870

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) Dis

Page 1789 of 2870

SUBARU FORESTER 2004 Service Repair Manual 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:
Immed

Page 1790 of 2870

SUBARU FORESTER 2004 Service Repair Manual 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 usi

Page 1791 of 2870

SUBARU FORESTER 2004 Service Repair Manual 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 faul

Page 1792 of 2870

SUBARU FORESTER 2004 Service Repair Manual 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 b

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.

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