SUBARU LEGACY 1997 Service Repair Manual

B2M1136
CR: DTC P1441
—FUEL TANK PRESSURE CONTROL
SYSTEM FUNCTION PROBLEM (HIGH INPUT)
—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M0928
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

390
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0005B
10CR1CHECK FUEL TANK PRESSURE CON-
TROL SOLENOID VALVE.
1) Turn ignition switch to OFF.
2) Connect test mode connector.
3) Turn ignition switch to ON.
: Does fuel tank pressure control solenoid
valve produce operating sound?
NOTE:
Fuel tank pressure control solenoid valve operation check
can also be executed using Subaru Select Monitor (Func-
tion mode: FD07). For the procedure, refer to“COMPUL-
SORY VALVE OPERATION CHECK MODE”. [T3F0].>
: Go to step10CR2.
: Replace fuel tank pressure control solenoid valve.
10CR2CHECK FUEL FILLER CAP AND FUEL
FILLER PIPE.
1) Turn ignition switch to OFF.
2) Open the fuel flap.
: Is there any damage at fuel filler cap and
fuel filler pipe?
: Repair or replace fuel filler cap and fuel filler pipe.
: Go to step10CR3.
B2M0925A
10CR3CHECK VENT CONTROL SOLENOID
VA LV E .
Turn ignition switch to ON.
: Does vent control solenoid valve produce
operating sound?
NOTE:
Vent control solenoid valve operation check can also be
executed using Subaru Select Monitor (Function mode:
FD08). For the procedure, refer to“COMPULSORY VALVE
OPERATION CHECK MODE”.
: Go to step10CR4.
: Replace vent control solenoid valve.
391
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1039B
10CR4CHECK PURGE CONTROL SOLENOID
VA LV E .
: Does purge control solenoid valve produce
operating sound?
NOTE:
Purge control solenoid valve operation check can also be
executed using Subaru Select Monitor (Function mode:
FD02). For the procedure, refer to“COMPULSORY VALVE
OPERATION CHECK MODE”.
: Go to step10CR5.
: Replace purge control solenoid valve.
10CR5CHECK EVAPORATIVE EMISSION CON-
TROL SYSTEM LINE.
Turn ignition switch to OFF.
: Is there any damage at canister?
: Repair or replace canister.
: Go to next.
: Is there any damage at fuel tank?
: Repair or replace fuel tank.
: Go to next.
: Is there clogging of hoses or pipes in
evaporative emission control system?
: Repair or replace hoses or pipes.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1137
CS: DTC P1442
—FUEL LEVEL SENSOR CIRCUIT RANGE/
PERFORMANCE PROBLEM 2—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M0933
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

393
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10CS1CHECK DTC P0461, P0462 OR P0463 ON
DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0461,
P0462 or P0463?
: Inspect DTC P0461, P0462 or P0463 using“10.
Diagnostics Chart with Trouble Code”. 2-7 [T10A0].>
NOTE:
In this case, it is not necessary to inspect this trouble.
: Replace fuel sending unit and fuel sub meter unit.
394
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0527
CT: DTC P1500
—RADIATOR FAN RELAY 1 CIRCUIT LOW
INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Radiator fan does not operate properly.

Overheating
WIRING DIAGRAM:
B2M1289
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.

395
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0736A
10CT1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Connect test mode connector at the lower portion of
instrument panel (on the driver’s side), to the side of the
center console box.
3) Turn ignition switch to ON.
B2M0608A
4) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 74 (+)—Chassis ground:
Does voltage change between 0 and 10
volts?
NOTE:
Radiator fan relay operation check can be executed using
Subaru Select Monitor (Function mode: FD03). For
procedure, refer to“COMPULSORY VALVE OPERATION
CHECK MODE”.
: Repair poor contact in ECM connector.
: Go to step10CT2.
B2M1138A
10CT2CHECK GROUND SHORT CIRCUIT IN
RADIATOR FAN RELAY 1 CONTROL CIR-
CUIT.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM.
3) Measure resistance of harness between ECM connec-
tor and chassis ground.
: Connector & terminal
(B84) No. 74—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in radiator fan relay 1
control circuit.
: Go to step10CT3.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1298A
10CT3
CHECK POWER SUPPLY FOR RELAY.
1) Disconnect connector (B52) from fuse and relay box
(F/B).
2) Turn ignition switch to ON.
3) Measure voltage between fuse and relay box (F/B) con-
nector and chassis ground.
: Connector & terminal
(B52) No. 4 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to step10CT4.
: Repair open circuit in harness between ignition
switch and fuse and relay box (F/B) connector.
10CT4
CHECK VEHICLE MODEL.
: Is the vehicle equipped with A/C?
: Go to step10CT5.
: Go to step10CT6.
B2M1299A
10CT5CHECK POWER SUPPLY FOR MAIN FAN
RELAY 1.
1) Turn ignition switch to OFF.
2) Connect connector (B52) to fuse and relay box (F/B).
3) Remove main fan relay 1.
4) Turn ignition switch to ON.
5) Measure voltage between main fan relay 1 connector
and chassis ground.
: Connector & terminal
(F28) No. 1 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to step10CT6.
: Repair open circuit in harness between fuse and
relay box (F/B) and main fan relay 1 connector.
397
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0535
10CT6CHECK MAIN FAN RELAY 1, SUB FAN
RELAY 1 AND MAIN FAN RELAY.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan relay 1 termi-
nals. (With A/C models only)
: Terminal
No. 1—No. 3:
Is the resistance between 87 and 107Ω?
: Go to next step 3).
: Replace main fan relay 1.
OBD0536
3) Remove sub fan relay 1. (With A/C models only)
Remove main fan relay. (Without A/C models only)
4) Measure resistance between sub fan relay 1 or main
fan relay terminals.
: Terminal
No. 1—No. 3:
Is the resistance between 83 and 117Ω?
: Go to step10CT7.
: Replace sub fan relay 1.
398
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0609A
10CT7CHECK OPEN CIRCUIT IN RADIATOR
FAN RELAY 1 CONTROL CIRCUIT.
1) Disconnect connector (F40) from fuse and relay box
(F/B).
2) Measure resistance of harness between ECM and main
fan relay 1 connector.
NOTE:
With A/C models only.
: Connector & terminal
(B84) No. 74—(F28) No. 3:
Is the resistance less than 1Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and main fan
relay 1 connector

Poor contact in coupling connector (F45)
: Is there poor contact in ECM or main fan
relay 1 connector?
: Repair poor contact in ECM or main fan relay 1
connector.
: Go to next step 3).
399
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles