1995 SUBARU LEGACY relay

4) Install SBF No. 4 to main fuse box.
5) Turn ignition switch to ON.
OBD0103A
6) Measure power supply voltage between ignition switch
connector and body.
: Connector & terminal
(B72) No. 1—Body/10 V, or more
: Go to step 4.
: Repair harness between ignition switch connector
and body.
OBD0726A
4
CHECK INHIBITOR SWITCH. (AT VEHICLES
ONLY)
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission.
3) Measure resistance between transmission harness
connector receptacle’s terminals.
: Connector & terminal
(T3) No. 11—No. 12/10Ω, or less
: Repair harness between starter motor and ignition
switch connector.
: Repair or replace inhibitor switch.
OBD0654A
4
CHECK STARTER INTERLOCK CIRCUIT.
(MT VEHICLES ONLY)
1) Turn ignition switch to“ST”.
2) Measure voltage between clutch switch connector and
body.
: Connector & terminal
(B107) No. 2—Body/10 V, or more
: Replace starter interlock relay.
: Go to next step.
11 0
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. Diagnostics for Engine Starting Failure

C: CONTROL MODULE POWER SUPPLY AND
GROUND LINE
1.Check main relay.
2.Check power supply circuit of ECM.
3.Check ground circuit of ECM.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>
WIRING DIAGRAM:

LHD model
OBD0105


11 2
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. Diagnostics for Engine Starting Failure

G2M0444
1
CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove main relay.
3) Connect battery to main relay terminals No. 1 and No.
2.
4) Measure resistance between main relay terminals.
: Terminals
No. 3—No. 5/10Ω, or less
No. 4—No. 6/10Ω, or less
: Go to step 2.
: Replace main relay.
OBD0107A
2
CHECK POWER SUPPLY CIRCUIT OF ECM.
1) Install main relay.
2) Disconnect connectors from ECM.
3) Turn ignition switch to ON.
4) Measure power supply voltage between ECM connec-
tor terminals.
: Connector & terminal
(B84) No. 15—No. 96/10 V, or more
(B84) No. 16—No. 96/10 V, or more
(B84) No. 42—No. 96/10 V, or more
: Go to step 3.
: Repair harness of power supply circuit.
11 4
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. Diagnostics for Engine Starting Failure

E: FUEL PUMP CIRCUIT
1.Check operating sound of fuel pump.
2.Check ground circuit of fuel pump.
3.Check power supply to fuel pump.
4.Check harness connector between fuel pump
and fuel pump relay.
5.Check fuel pump relay.
6.Check harness connector between ECM and
fuel pump relay.
WIRING DIAGRAM:

LHD model
OBD0131





120
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. Diagnostics for Engine Starting Failure

1
CHECK OPERATING SOUND OF FUEL PUMP.
Make sure that fuel pump is in operation for two seconds
when turning ignition switch to ON.
: Does fuel pump produce operating sound?
: Check fuel injector circuit.
: Go to step 2.
OBD0132A
2
CHECK GROUND CIRCUIT OF FUEL PUMP.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel pump.
3) Measure resistance of harness connector between fuel
pump and body.
: Connector & terminal
(R58) No. 4—Body /10Ω, or less
: Go to step 3.
: Repair open circuit of fuel pump ground circuit.
OBD0133A
3
CHECK POWER SUPPLY TO FUEL PUMP.
1) Turn ignition switch to ON.
2) Measure voltage of power supply circuit between fuel
pump connector and body.
: Connector & terminal
(R58) No. 1—Body /10 V, or more
: Replace fuel pump.
: Go to step 4.
OBD0134A
4CHECK HARNESS CONNECTOR BETWEEN
FUEL PUMP AND FUEL PUMP RELAY.
1) Turn ignition switch to OFF.
2) Measure resistance of harness connector between fuel
pump and fuel pump relay.
: Connector & terminal
(R58) No. 1—(B46) No. 4/10Ω, or less
: Go to next.
: Repair open circuit of harness between fuel pump
and fuel pump relay connector.
: Connector & terminal
(R58) No. 1—Body/1 MΩ, or more
: Go to step 5.
: Repair short circuit of harness between fuel pump
and fuel pump relay connector.
122
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. Diagnostics for Engine Starting Failure

G2M0461
5
CHECK FUEL PUMP RELAY.
1) Disconnect connectors from fuel pump relay and main
relay.
2) Remove fuel pump relay and main relay with bracket.
3) Connect battery to fuel pump relay connector terminals
No. 1 and No. 3.
4) Measure resistance between connector terminals of
fuel pump relay.
: Terminals
No. 2—No. 4/10Ω, or less
: Go to step 6.
: Replace fuel pump relay.
OBD0136A
6CHECK HARNESS CONNECTOR BETWEEN
ECM AND FUEL PUMP RELAY.
1) Disconnect connectors from ECM.
2) Measure resistance of harness connector between
ECM and fuel pump relay.
: Connector & terminal
(B84) No. 84—(B46) No. 3/10Ω, or less
: Repair harness between ECM and fuel pump
relay connector.
: Confirm good connection in ECM connector.
123
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. Diagnostics for Engine Starting Failure

10. General Diagnostics Table
1. FOR ENGINE
12345678910111213
Problem parts
Mass air flow sensor
Engine coolant temperature sensor (*1)
Throttle position sensor
Crankshaft position sensor & Camshaft position sensor (*2)
Idle air control solenoid valve
Knock sensor
Purge control solenoid valve
EGR valve
Fuel injection parts (*3)
Ignition parts (*4)
Fuel pump and relay
A/C switch and A/C cut relay
Engine torque control signal circuitSymptom
1 Engine stalls during idling.   
2 Rough idling    
3 Engine does not return to idle.
4 Poor acceleration   
5Engine stalls or engine sags or hesi-
tates at acceleration.    
6 Surge   
7 Spark knock
8 After burning in exhaust system  
*1: The mark,, indicates the symptom occurring only in cold temperatures.
*2: For items with the mark,, ensure the secure installation of crankshaft position sensor and camshaft position sensor. Replacement is
not necessary.
*3: Check fuel injector, fuel pressure regulator and fuel filter.
*4: Check igniter, ignition coil and spark plug.
NOTE:
Malfunction of parts other than the above is also possible. Refer to 1. Engine Trouble in General [K100] in Repair Section 2-3 of the Ser-
vice Manual.
128
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. General Diagnostics Table

DTC
No.Abbreviation
(Subaru select monitor)Item Page
P0705 RNG Transmission range sensor circuit malfunction 274
P0710 ATF Transmission fluid temperature sensor circuit malfunction 279
P0720 ATVSP Output speed sensor (vehicle speed sensor 1) circuit malfunction 281
P0725 ATNE Engine speed input circuit malfunction 283
P0731 GR
—1 Gear 1 incorrect ratio
285 P0732 GR
—2 Gear 2 incorrect ratio
P0733 GR
—3 Gear 3 incorrect ratio
P0734 GR
—4 Gear 4 incorrect ratio
P0740 LU
—F Torque converter clutch system malfunction 289
P0743 LU Torque converter clutch system electrical 294
P0748 PL Pressure control solenoid electrical 296
P0753 SFT1 Shift solenoid A electrical 298
P0758 SFT2 Shift solenoid B electrical 300
P0760 OVR
—F Shift solenoid C malfunction 302
P0763 OVR Shift solenoid C electrical 307
P1100 ST
—SW Starter switch circuit malfunction 309
P1101 N
—SW Neutral position switch circuit malfunction [MT vehicles] 311
P1101 N
—SW Neutral position switch circuit malfunction [AT vehicles] 315
P1102 BR Pressure sources switching solenoid valve circuit malfunction 319
P1103 TRQ Engine torque control signal circuit malfunction 325
P1104 TCS TCS signal circuit malfunction 328
P1500 FAN
—1 Radiator fan relay 1 circuit malfunction 331
P1502 FAN
—F Radiator fan function problem 338
P1700 ATTH Throttle position sensor circuit malfunction for automatic transmission 341
P1701 CRS Cruise control set signal circuit malfunction for automatic transmission 343
P1702 ATDIAG Automatic transmission diagnosis input signal circuit malfunction 346
134
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code