Page 1969 of 2890

: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
OBD0713A
10V3CHECK HARNESS BETWEEN FUEL
INJECTOR AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel injector on faulty cylin-
ders.
3) Measure resistance between ECM connector and
engine ground on faulty cylinders.
: Connector & terminal
#1 (E5) No. 1—Engine ground:
#2 (E16) No. 1—Engine ground:
#3 (E6) No. 1—Engine ground:
#4 (E17) No. 1—Engine ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between fuel injec-
tor and ECM connector.
: Go to next step 4).
B2M0557A
4) Measure resistance of harness connector between
ECM connector and fuel injector on faulty cylinders.
: Connector & terminal
#1 (B84) No. 96—(E5) No. 1:
#2 (B84) No. 70—(E16) No. 1:
#3 (B84) No. 44—(E6) No. 1:
#4 (B84) No. 16—(E17) No. 1:
Is the resistance less than 1Ω?
: Go to step10V4.
: Repair open circuit in harness between ECM and
fuel injector connector.
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Page 1970 of 2890
G2M0464
10V4
CHECK FUEL INJECTOR.
Measure resistance between fuel injector terminals on
faulty cylinder.
: Terminals
No. 1—No. 2:
Is the resistance between 5 and 20Ω?
: Replace faulty fuel injector.
: Go to step10V5.
OBD0715A
10V5
CHECK POWER SUPPLY LINE.
1) Turn ignition switch to ON.
2) Measure voltage between fuel injector and engine
ground on faulty cylinders.
: Connector & terminal
#1 (E5) No. 2 (+)—Engine ground ( ):
#2 (E16) No. 2 (+)—Engine ground ( ):
#3 (E6) No. 2 (+)—Engine ground ( ):
#4 (E17) No. 2 (+)—Engine ground ( ):
Is the voltage more than 10 V?
: Repair poor contact in all connectors in fuel injec-
tor circuit.
: Repair harness and connector.
NOTE:
In this case, repair the following:
Open circuit in harness between main relay and fuel
injector connector on faulty cylinders
Poor contact in main relay connector
Poor contact in fuel injector connector on faulty cylinders
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10. Diagnostics Chart with Trouble Code
Page 1971 of 2890
OBD0277
W: DTC P0301
—CYLINDER 1 MISFIRE DETECTED
(MIS
—1)—
OBD0278
X: DTC P0302
—CYLINDER 2 MISFIRE DETECTED
(MIS
—2)—
OBD0279
Y: DTC P0303
—CYLINDER 3 MISFIRE DETECTED
(MIS
—3)—
OBD0280
Z: 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
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10. Diagnostics Chart with Trouble Code
Page 1972 of 2890
10Z1Check DTC P0100, P0101, P0115, P0125,
P0201, P0202, P0203 and P0204 on display.
10Z2Connect Subaru Select Monitor and read data.
10Z3Check air intake system.
10Z4Check misfire symptom.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0558
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10. Diagnostics Chart with Trouble Code
Page 1973 of 2890
WIRING DIAGRAM:
RHD Model
B2M0791
10Z1CHECK DTC P0100, P0101, P0115, P0125,
P0201, P0202, P0203, AND P0204 ON
DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0100,
P0101, P0115, P0125, P0201, P0202, P0203
and P0204?
: Inspect DTC P0100, P0101, P0115, P0125,
P0201, P0202, P0203 and P0204 using“10. Diag-
nostics Chart with Trouble Code 2-7 [T1000]”.
NOTE:
In this case, it is not necessary to inspect DTC P0301,
P0302, P0303 and P0304.
: Go to step10Z2.
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Page 1974 of 2890
OBD0145A
10Z2CONNECT 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 Moni-
tor switch to ON.
B2M0759
4) Read data on Subaru Select Monitor.
Designate mode use function key.
Function mode: F42
NOTE:
F42: Maximum and minimum EGR system pressure value
are indicated at the same time.
5) Print out the displayed data on paper.
G3M0152
6) Clear memory on Subaru Select Monitor.
Designate mode use function key.
Press [F], [C], [0], [ENT] in that order.
OBD0008C
7) Start engine, and drive the vehicle more than 10 min-
utes.
: Is the MIL coming on or blinking?
: Go to step10Z3.
: Go to next.
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Page 1975 of 2890

: Has the vehicle been run empty of fuel?
: Finish diagnostics operation, if the engine has no
abnormality.
: Go to next.
: Was the cause of misfire diagnosed when
the engine is running?
NOTE:
Ex. Remove spark plug cord, etc.
: Finish diagnostics operation, if the engine has no
abnormality.
: Repair connector.
NOTE:
In this case, repair the following:
Poor contact in ignitor connector
Poor contact in ignition coil connector
Poor contact in fuel injector connector on faulty cylinders
Poor contact in ECM connector
Poor contact in coupling connector (B22)
10Z3
CHECK AIR INTAKE SYSTEM.
: Is there a fault in air intake system?
NOTE:
Check the following items:
Are there air leaks or air suction caused by loose or dis-
located nuts and bolts?
Are there cracks or any disconnection of hoses?
: Repair air intake system.
: Go to step10Z4.
OBD0145A
10Z4
CHECK MISFIRE SYMPTOM.
1) Turn ignition switch to OFF.
2) Connect the Subaru Select Monitor or the OBD-II gen-
eral scan tool to data link connector.
3) Turn ignition switch to ON, and turn Subaru Select
Monitor or OBD-II general scan tool switch to ON.
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Page 1976 of 2890

G3M0152
4) Read diagnostic trouble code (DTC).
Subaru Select Monitor
Designate mode use function key.
Function mode: FB1
OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Operation Manual.
NOTE:
Perform diagnosis according to the items listed below.
DTC Next action
Only one cylinder Go to step
1.
P0301 and P0302 Go to step
2.
P0303 and P0304 Go to step
3.
P0301 and P0303 Go to step
4.
P0302 and P0304 Go to step
5.
Others Go to step
6.
1ONLY ONE CYLINDER
: Is there a fault in that cylinder?
NOTE:
Check the following items.
Spark plug
Spark plug cord
Fuel injector
Compression ratio
: Go to next.
: Go to DTC P0170, 2-7 [T10P3], [T10P4] and
[T10P5].
2GROUP OF #1 AND #2 CYLINDERS
: Are there faults in #1 and #2 cylinders?
NOTE:
Check the following items.
Spark plugs
Fuel injectors
Ignition coil
: Go to next.
: Go to DTC P0170, 2-7 [T10P3], [T10P4] and
[T10P5].
NOTE:
If no abnormal is discovered, check for“8. F: IGNITION
SYSTEM”of #1 and #2 cylinders side.
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10. Diagnostics Chart with Trouble Code