Page 1929 of 2890
OBD0199
J: DTC P0130
—FRONT OXYGEN SENSOR CIRCUIT
MALFUNCTION (FO2
—V)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10J1Check for other causes affecting exhaust gas.
10J2Check front oxygen sensor data.
10J3Check harness between front oxygen sensor
and ECM connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0544
161
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 1930 of 2890
WIRING DIAGRAM:
RHD Model
B2M0787
10J1CHECK FOR OTHER CAUSES AFFECT-
ING EXHAUST GAS.
: Is CO % more than 2 % after engine warm-
up?
: Check fuel system.
NOTE:
Check for use of improper fuel.
Check if engine oil or coolant level is extremely low.
: Go to step10J2.
OBD0145A
10J2
CHECK FRONT OXYGEN SENSOR DATA.
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) Start engine and Turn the Subaru Select Monitor and
the OBD-II general scan tool switch to ON.
4) Warm-up the engine until coolant temperature is above
70°C (160°F) and keep the engine speed at 2,000 rpm to
3,000 rpm for one minute.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
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B2M0487
5) Read data on Subaru Select Monitor or the OBD-II gen-
eral scan tool.
Subaru Select Monitor
Designate mode using function key.
Function mode: F12
F12: Front oxygen sensor max. and min. output signals
are indicated at the same time.
: Is the difference of voltage less than 0.1 V
between the value of max. output and min.
output with function mode F12?
: Go to step10J3.
: Replace front oxygen sensor.
OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
B2M0545A
10J3CHECK HARNESS BETWEEN FRONT
OXYGEN SENSOR AND ECM CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from front oxygen sensor.
3) Turn ignition switch to ON.
4) Measure voltage between front oxygen sensor harness
connector and engine ground.
: Connector & terminal
(B18) No. 3 (+)—Engine ground ( ):
Is the voltage more than 0.2 V?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:
Open circuit in harness between ECM and front oxygen
sensor connector
Poor contact in the ECM connector
: Is there poor contact in front oxygen sensor
connector?
: Repair poor contact in front oxygen sensor con-
nector.
: Replace front oxygen sensor.
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10. Diagnostics Chart with Trouble Code
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OBD0209
K: DTC P0133
—FRONT OXYGEN SENSOR CIRCUIT SLOW
RESPONSE (FO2
—R)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10K1Check DTC P0130 on display.
10K2Check exhaust system.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0544
164
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 1933 of 2890
WIRING DIAGRAM:
RHD Model
B2M0787
10K1
CHECK DTC P0130 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0130?
: Inspect DTC P0130 using“10. Diagnostics Chart
with Trouble Code 2-7 [T1000]”.
NOTE:
In this case, it is not necessary to inspect DTC P0133.
: Go to step10K2.
10K2
CHECK EXHAUST SYSTEM.
: Is there a fault in exhaust system?
NOTE:
Check the following items.
Loose installation of front portion of exhaust pipe onto
cylinder heads
Loose connection between front exhaust pipe and front
catalytic converter
Damage of exhaust pipe resulting in a hole
: Repair exhaust system.
: Replace front oxygen sensor.
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10. Diagnostics Chart with Trouble Code
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OBD0212
L: DTC P0135
—FRONT OXYGEN SENSOR HEATER
CIRCUIT MALFUNCTION (FO2H)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10L1Check DTC P0141 on display.
10L2Connect Subaru Select Monitor or the OBD-II
general scan tool, and read data.
10L3Check output signal from ECM. (Using voltage
meter.)
10L4Check power supply to front oxygen sensor.
10L5Check front oxygen sensor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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10. Diagnostics Chart with Trouble Code
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WIRING DIAGRAM:
LHD Model
B2M0546
167
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 1936 of 2890
WIRING DIAGRAM:
RHD Model
B2M0788
168
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code