SUBARU LEGACY 1995 Service Repair Manual

1.Check output signal from ECM.

2.Check harness.
3.Check harness.
4.Check fuel injector.
5.Check power supply.
CAUTION:

Check or repair only faulty cylinders.

After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. <Ref. to
[T3D0] and [T3E0].>
WIRING DIAGRAM:

LHD model
OBD0137



205
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD model
B2M0447
206
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0712A
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector and body on
faulty cylinders.
: Connector & terminal
#1 (B84) No. 2—Body/10 V, or more
#2 (B84) No. 1—Body/10 V, or more
#3 (B84) No. 18—Body/10 V, or more
#4 (B84) No. 17—Body/10 V, or more
: Go to step 2.
: Go to step 3.
OBD0712A
2
CHECK HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel injector on faulty cylin-
der.
3) Turn ignition switch to ON.
4) Measure voltage between ECM connector and body on
faulty cylinders.
: Connector & terminal
#1 (B84) No. 2—Body/10 V, or more
#2 (B84) No. 1—Body/10 V, or more
#3 (B84) No. 18—Body/10 V, or more
#4 (B84) No. 17—Body/10 V, or more
: Repair short circuit of harness between ECM and
fuel injector. After repair, replace ECM.
: Go to next step.
G2M0464
5) Turn ignition switch to OFF.
6) Measure resistance between fuel injector terminals on
faulty cylinder.
: Terminals
No. 1—No. 2/1Ω, or less
: Replace faulty fuel injector and ECM.
: Go to next.
207
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
OBD0713A
3
CHECK HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel injector on faulty cylin-
ders.
3) Measure resistance between fuel injector on faulty cyl-
inders and body.
: Connector & terminal
#1 (E5) No. 1—Body/10Ω, or less
#2 (E16) No. 1—Body/10Ω, or less
#3 (E6) No. 1—Body/10Ω, or less
#4 (E17) No. 1—Body/10Ω, or less
: Repair short circuit of harness between fuel injec-
tor and body.
: Go to the next step.
OBD0714A
4) Measure resistance of harness connector between
ECM connector and fuel injector on faulty cylinders.
: Connector & terminal
#1 (B84) No. 2—(E5) No. 1/10Ω, or less
#2 (B84) No. 1—(E16) No. 1/10Ω, or less
#3 (B84) No. 18—(E6) No. 1/10Ω, or less
#4 (B84) No. 17—(E17) No. 1/10Ω, or less
: Repair open circuit of harness between ECM and
fuel injector.
: Go to step 4.
208
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

G2M0464
4
CHECK FUEL INJECTOR.
Measure resistance between fuel injector terminals on
faulty cylinder.
: Terminals
No. 1—No. 2/5—20Ω
: Replace faulty fuel injector.
: Go to step 5.
OBD0715A
5
CHECK POWER SUPPLY.
1) Turn ignition switch to ON.
2) Measure voltage between fuel injector and body on
faulty cylinders.
: Connector & terminal
#1 (E5) No. 2—Body/10 V, or more
#2 (E16) No. 2—Body/10 V, or more
#3 (E6) No. 2—Body/10 V, or more
#4 (E17) No. 2—Body/10 V, or more
: Check and repair the following items.

Open circuit of harness between main relay
and fuel injector for faulty cylinders

Poor contact in main relay connector

Poor contact in fuel injector connector for the
faulty cylinders
: Check for poor contact of all connectors in WIR-
ING DIAGRAM on page 205, 206.
209
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0277
U: DTC P0301
—CYLINDER 1 MISFIRE DETECTED (MIS
—1)
—
OBD0278
V: DTC P0302
—CYLINDER 2 MISFIRE DETECTED (MIS
—2)
—
OBD0279
W: DTC P0303
—CYLINDER 3 MISFIRE DETECTED (MIS
—3)
—
OBD0280
X: DTC P0304
—CYLINDER 4 MISFIRE DETECTED (MIS
—4)
—
DTC DETECTING CONDITION:

Two consecutive trips with fault

Immediately at fault recognition (A misfire which could
damage catalyst occurs.)
TROUBLE SYMPTOM:

Engine stalls.

Erroneous idling

Rough driving
210
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

1.Check DTC P0100, P0101, P0115, P0125,
P0201, P0202, P0203 and P0204 on display.
No
Ye s

Inspect DTC P0100, P0101, P0115, P0125, P0201,
P0202, P0203 and P0204 using“11. Diagnostics Chart
with Trouble Code [T1100]”.

In this case, it is unnecessary to inspect DTC
P0301, P0302, P0303 and P0304.
2.Connect Subaru Select Monitor and read data.
3.Check air intake system.
4.Check misfire symptom.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. <Ref. to
[T3D0] and [T3E0].>
WIRING DIAGRAM:

LHD model
OBD0282



211
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD model
B2M0452
212
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0145A
2CONNECT SUBARU SELECT MONITOR AND
READ DATA.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor to the data link connec-
tor.
3) Turn ignition switch to ON, and turn Subaru Select
Monitor switch to ON.
G3M0152
4) Read data on Subaru Select Monitor.
Designate mode use function key.
Function mode: F33, F34, F35, F36, F37 and F38
NOTE:
F37 and F38 are AT models only.

F33: Maximum misfire rate of cylinder #1 is indicated.

F34: Maximum misfire rate of cylinder #2 is indicated.

F35: Maximum misfire rate of cylinder #3 is indicated.

F36: Maximum misfire rate of cylinder #4 is indicated.

F37: Maximum EGR system pressure value is indicated.

F38: Minimum EGR system pressure value is indicated.
G3M0152
5) Clear memory on Subaru Select Monitor.
Designate mode use function key.
Press [F], [C], [0], [ENT] in that order.
6) Start engine, and drive the vehicle more than 10 min-
utes.
213
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0627
7) Read data on Subaru Select Monitor.
Designate mode use function key.
Function mode: F33, F34, F35 and F36
: Is the maximum misfire rate of each cylin-
der less than 2 %?
: Go to next.
: Go to step 3.
: The vehicle has been empty of fuel.
:
The engine has no abnormality.

Finish diagnostics operation.
: Go to next.
: Check if the cause of misfire was made
when the engine is running.
Ex. Remove spark plug cord, etc.
:
The engine has no abnormality.

Finish diagnostics operation.
: Repair poor contact in ignitor, ignition coil, fuel
injector, ECM and coupling harness connector.
3
CHECK AIR INTAKE SYSTEM.
: Check the following items.

1Are there air leaks or air suction caused
by loose or dislocated nuts and bolts?

2Are there cracks or any disconnection of
hoses?
: Repair air intake system.
: Go to step 4.
214
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code