1997 SUBARU LEGACY check engine

10CV1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code”.
NOTE:
In this case, it is not necessary to inspect DTC P1507.
: Go to step10CV2.
10CV2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is there a fault in air intake system?
NOTE:
Check the following items.

Loose installation of intake manifold, idle air control sole-
noid valve and throttle body

Cracks of intake manifold gasket, idle air control sole-
noid valve gasket and throttle body gasket

Loose connections and cracks of idle air control solenoid
valve by-pass hoses

Disconnections of vacuum hoses
: Repair air suction and leaks.
: Replace idle air control solenoid valve.
404
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

: Connector & terminal
(B56) No. 3—(B94) No. 3:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between TCM and
CCM connector.
OBD0515A
4) Measure resistance of harness between TCM and
chassis ground.
: Connector & terminal
(B56) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between TCM and
CCM connector.
: Go to step10CZ2.
OBD0513A
10CZ2
CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to TCM and CCM.
2) Lift-up the vehicle or set the vehicle on free rollers.
CAUTION:
On AWD models, raise all wheels off ground.
3) Start the engine.
4) Cruise control main switch to ON.
5) TCS OFF switch to ON. (with TCS models only)
6) Move selector lever to“D”and slowly increase vehicle
speed to 50 km/h (31 MPH).
7) Cruise control set switch to ON.
8) Measure voltage between TCM and chassis ground.
: Connector & terminal
(B56) No. 3 (+)—Chassis ground ():
Is the resistance less than 1 V?
: Go to next.
: Check cruise control set circuit. [T7A0].>
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Replace TCM.
412
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10DC1
CHECK TRANSMISSION TYPE.
: Is transmission type AT?
: Go to step10DC2.
: Check AT/MT identification circuit. [T10DD0].>
10DC2
CHECK DRIVING CONDITION.
1) Start and warm-up the engine until the radiator fan
makes one complete rotation.
2) Drive the vehicle.
: Is AT shift control functioning properly?
: Go to step10DC3.
: Replace TCM.
10DC3
CHECK ACCESSORY.
: Are car phone and/or CB installed on
vehicle?
: Repair grounding line of car phone or CB system.
: Replace TCM.
420
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0618A
10DD1CHECK HARNESS BETWEEN ECM CON-
NECTOR AND ENGINE GROUNDING
TERMINAL.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 81 (+)—Chassis ground ():
Is the voltage more than 2 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM connector and
engine grounding terminal

Poor contact in engine grounding terminal

Poor contact in coupling connector (B22)
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
422
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

DTC
No.Abbreviation
(Subaru Select Monitor)Item Page
P0341 CAM
—R Camshaft position sensor circuit range/performance problem 463
P0400 EGR Exhaust gas recirculation flow malfunction 464
P0403 EGRSOL Exhaust gas recirculation circuit low input 465
P0420 CAT Catalyst system efficiency below threshold 466
P0440 EVAP Evaporative emission control system malfunction 467
P0441 CPC
—F Evaporative emission control system incorrect purge flow 468
P0443 CPC Evaporative emission control system purge control valve circuit low input 469
P0446 VCMSOL
—LO Evaporative emission control system vent control low input 470
P0451 TNKP
—F Evaporative emission control system pressure sensor range/performance problem 473
P0452 TNKP
—LOW Evaporative emission control system pressure sensor low input 474
P0453 TNKP
—HI Evaporative emission control system pressure sensor high input 479
P0461 FLVL
—R Fuel level sensor circuit range/performance problem 484
P0462 FLVL
—LOW Fuel level sensor circuit low input 486
P0463 FLVL
—HI Fuel level sensor circuit high input 492
P0500 VSP Vehicle speed sensor malfunction 497
P0505 ISC Idle control system malfunction 498
P0506 ISC
—RLOW Idle control system RPM lower than expected 499
P0507 ISC
—RHI Idle control system RPM higher than expected 500
P0600—Serial communication link malfunction 501
P0601 RAM Internal control module memory check sum error 502
P0703 ATBRK Brake switch input malfunction 503
P0705 ATRNG Transmission range sensor circuit malfunction 504
P0710 ATF Transmission fluid temperature sensor circuit malfunction 505
P0720 ATVSP Output speed sensor (vehicle speed sensor 1) circuit malfunction 506
P0725 ATNE Engine speed input circuit malfunction 507
P0731 ATGR1 Gear 1 incorrect ratio 508
P0732 ATGR2 Gear 2 incorrect ratio 508
P0733 ATGR3 Gear 3 incorrect ratio 508
P0734 ATGR4 Gear 4 incorrect ratio 508
P0740 ATLU
—F Torque converter clutch system malfunction 510
P0743 ATLU Torque converter clutch system electrical 511
P0748 ATPL Pressure control solenoid electrical 512
P0753 ATSFT1 Shift solenoid A electrical 513
P0758 ATSFT2 Shift solenoid B electrical 514
P0760 ATOVR
—F Shift solenoid C malfunction 515
P0763 ATOVR Shift solenoid C electrical 516
P1100 ST
—SWOFF Starter switch circuit low input 517
P1101 N
—SWOFF Neutral position switch circuit high input [AT vehicles] 518
P1102 BR Pressure sources switching solenoid valve circuit low input 519
P1103 TRQ Engine torque control signal circuit malfunction 520
P1120 ST
—SWON Starter switch circuit high input 521
P1121 N
—SWON Neutral position switch circuit low input [AT vehicles] 522
424
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

B2M1067
H: DTC P0116
—ENGINE COOLANT TEMPERATURE
SENSOR CIRCUIT LOW INPUT—
WIRING DIAGRAM:
B2M0539
NOTE:
Check engine coolant temperature sensor circuit.

432
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

B2M1068
I: DTC P0117
—ENGINE COOLANT TEMPERATURE
SENSOR CIRCUIT HIGH INPUT—
WIRING DIAGRAM:
B2M0539
NOTE:
Check engine coolant temperature sensor circuit.

433
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

B2M1016A
11V1CONNECT SUBARU SELECT MONITOR
OR THE OBD-II GENERAL SCAN TOOL,
AND READ DATA.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
3) Turn ignition switch to ON and Subaru Select Monitor or
OBD-II general scan tool switch to ON.
4) Start engine.
H2M1308
5) Read data on Subaru Select Monitor or OBD-II general
scan tool.

Subaru Select Monitor
Designate mode using function key.
Function mode: F44

F44: Fuel temperature is indicated in“°C”and“°F”.
: Is the value greater than 150°Cor300°Fin
function mode F44?
: Go to step11V2.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time.

OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
G2M0340
11V2CHECK HARNESS BETWEEN FUEL TEM-
PERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Remove access hole lid.
3) Disconnect connector from fuel pump.
B2M1016A
4) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
5) Turn ignition switch and Subaru Select Monitor or
OBD-II general scan tool switch to ON.
448
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles