fuel SUBARU LEGACY 1995 Service Repair Manual

OBD0265A
DESCRIPTION:

The MFI system employs a gallery type (side-feed type)
fuel injector.

The gallery type fuel injector is installed in the fuel pipe
to allow cooling of the injector by the fuel.

The features of this type of fuel injector are as follows:
1) High heat resistance
2) Low driving noise
3) Easy to service
4) Small size

The fuel injector injects fuel according to the valve open
signal received from the ECM.

The nozzle is attached on the top of the fuel injector. The
needle valve is lifted by the solenoid coil through the
plunger on arrival of the valve open signal.

Since the injection opening, the lifted level of valve and
the regulator-controlled fuel pressure are kept constant,
the amount of fuel to be injected can be controlled only by
the valve open signal from the ECM.
DTC DETECTING CONDITION:

Immediately at fault recognition
TROUBLE SYMPTOM:

Failure of engine to start

Engine stalls.

Erroneous idling

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

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. [T3D0] and [T3E0].>
WIRING DIAGRAM:

LHD model
OBD0137



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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.
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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.
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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.
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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.
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11. Diagnostics Chart with Trouble Code

4
CHECK MISFIRE SYMPTOM.
NOTE:

Perform diagnosis according to the items listed below.

Use the MAX. misfire rate values read in step 2-4).
DTC MAX. misfire rate Next
Only one cylinder—Go to step1.
P0301 and P0302 Both rate are at 100 %, or more. Go to step
2.
P0303 and P0304 Both rate are at 100 %, or more. Go to step
3.
P0301 and P0303 Both rate are at 100 %, or more. Go to step
4.
P0302 and P0304 Both rate are at 100 %, or more. Go to step
5.
Others—Go to step
6.
1ONLY ONE CYLINDER
: Check the following items for that cylinder.

Spark plug

Spark plug cord

Fuel injector

Compression ratio

2GROUP OF #1 AND #2 CYLINDERS
: Check the following items for #1 and #2 cyl-
inders.

Spark plugs

Fuel injectors
NOTE:
If no abnormal is discovered, check for“9. F: IGNITION
SYSTEM”of #1 and #2 cylinders side.

3GROUP OF #3 AND #4 CYLINDERS
: Check the following items for #3 and #4 cyl-
inders.

Spark plugs

Fuel injectors
NOTE:
If no abnormal is discovered, check for“9. F: IGNITION
SYSTEM”of #3 and #4 cylinders side.

4GROUP OF #1 AND #3 CYLINDERS
: Check the following items for #1 and #3 cyl-
inders.

Spark plugs

Fuel injectors

Skipping timing belt teeth
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11. Diagnostics Chart with Trouble Code

5GROUP OF #2 AND #4 CYLINDERS
: Check the following items for #2 and #4 cyl-
inders.

Spark plugs

Fuel injectors

Skipping timing belt teeth

6THE CYLINDER AT RANDOM
: Is the engine idle rough?
: Go to next. (AT models only)
: Go to DTC P0170 [T11P3], [T11P4] and [T11P5].
NOTE:
On MT models, go to DTC P0170 [T11P3], [T11P4] and
[T11P5].
OBD0631
OBD0632
: Is the differential pressure between maxi-
mum EGR system pressure (value of func-
tion mode F37) and minimum EGR system
pressure (value of function mode F38) less
than 10 mmHg?
NOTE:
Use the values read in step 3 for function modes F37 and
F38.
: Replace EGR valve.
: Go to DTC P0170 [T11P3], [T11P4] and [T11P5].
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11. Diagnostics Chart with Trouble Code

OBD0331
AE: DTC P0441
—EVAPORATIVE EMISSION CONTROL
SYSTEM INCORRECT PURGE FLOW
(CPC
—F)—
DESCRIPTION:

The evaporative emission control system is employed to
prevent evaporative fuel from being discharged into ambi-
ent atmosphere. This system includes a canister, purge
control solenoid valve, fuel cut valve, their connecting lines,
etc.

Gasoline vapor evaporated from the fuel tank is intro-
duced into the canister located in the engine compartment
through the evaporation line, and is absorbed on activated
carbon in it. A fuel cut valve is also incorporated on the tank
fuel line.

The purge control solenoid valve is controlled by the
ECM and provides optimal purge control according to the
engine coolant temperature, engine load and vehicle
speed.
OBD0332A
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

G6M0205
11) Each connector number shown in the wiring diagram
corresponds to that in the wiring harness. The location of
each connector in the actual vehicle is determined by read-
ing the first character of the connector (for example, a“F”
for F8,“i”for i16, etc.) and the type of wiring harness.
The first character of each connector number refers to the
area or system of the vehicle, as indicated in table below.
Symbol Wiring harness and Cord
F Front wiring harness
B Bulkhead wiring harness
E Engine wiring harness
T Transmission cord
D Door cord LH & RH, Rear gate cord
I Instrument panel wiring harness
RRear wiring harness, Rear defogger cord
Room light cord,
Fuel tank cord,
Sunroof cord,
Trunk lid cord
P Floor wiring harness
7
6-3WIRING DIAGRAM
1. General Description