Page 1385 of 2248
WIRING DIAGRAM:
RHD model
B2M0450
2
CHECK EXHAUST SYSTEM.
: Check the following.
Looseness of installation portion of front
exhaust pipe onto cylinder heads
Loosened connection of front exhaust
pipe and front catalytic converter
Damage of exhaust pipe which make a
hole
: Repair exhaust system.
: Replace front oxygen sensor.
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OBD0212
L: DTC P0135
—FRONT OXYGEN SENSOR HEATER
CIRCUIT MALFUNCTION (FO2H)—
DESCRIPTION:
Refer to“J: DTC P0130—FRONT OXYGEN SENSOR
CIRCUIT MALFUNCTION—[T11J0]”.
DTC DETECTING CONDITION:
Two consecutive trips with fault
180
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11. Diagnostics Chart with Trouble Code
Page 1387 of 2248
1.Connect Subaru Select Monitor or the OBD-II
general scan tool, and read data.
2.Check output signal from ECM. (Using voltage
meter.)
3.Check power supply to front oxygen sensor.
4.Check front oxygen sensor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
[T3D0] and [T3E0].>
WIRING DIAGRAM:
LHD model
OBD0201
181
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1388 of 2248
WIRING DIAGRAM:
RHD model
B2M0462
182
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code
Page 1389 of 2248

OBD0145A
1CONNECT SUBARU SELECT MONITOR OR
THE OBD-II GENERAL SCAN TOOL, AND
READ DATA.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
3) Turn ignition switch to ON and Subaru Select Monitor or
OBD-II general scan tool switch to ON.
4) Start engine.
OBD0215
5) Read data on Subaru Select Monitor or OBD-II general
scan tool.
Subaru Select Monitor
Designate mode using function key.
Function mode: F29
F29: Front oxygen sensor heater current is indicated.
: Is the reading of F29 0.2 A, or more?
: Go to step 2.
: Repair connector.
NOTE:
In this case, poor contact in front oxygen sensor connec-
tor and ECM connector can be the possible cause.
OBD-II scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
OBD0216A
2CHECK OUTPUT SIGNAL FROM ECM. (USING
VOLTAGE METER.)
1) Start and idle the engine.
2) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 44—Body/1.0 V, or less
: Go to step 3.
: Go to next.
: Is the voltage less than 1.0 V while shaking
harness and connector of ECM?
: Repair poor contact in ECM connector.
: Go to next step.
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OBD0216A
3) Disconnect connector from front oxygen sensor.
4) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 44—Body/1.0 V, or less
: Replace ECM.
: Repair short circuit of harness between ECM and
front oxygen sensor connector. After repair short
circuit of harness, replace ECM.
OBD0667A
3CHECK POWER SUPPLY TO FRONT OXYGEN
SENSOR.
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 connec-
tor and body.
: Connector & terminal
(B18) No. 2—Body/10 V, or more
: Go to step 4.
: Repair power supply line.
NOTE:
In this case, repair poor contact in connector or open cir-
cuit of harness between main relay and front oxygen sen-
sor.
OBD0706
4
CHECK FRONT OXYGEN SENSOR.
1) Turn ignition switch to OFF.
2) Measure resistance between front oxygen sensor con-
nector terminals.
: Terminals
No. 1—No. 2/30Ω, or less
: Repair harness and connector.
NOTE:
In this case, repair the following:
1Open circuit of harness between the front oxygen sen-
sor connector and the ECM connector
2Poor contact in front oxygen sensor connector
3Poor contact in ECM connector
: Replace front oxygen sensor.
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OBD0220
M: DTC P0136
—REAR OXYGEN SENSOR CIRCUIT
MALFUNCTION (RO2
—V)—
DESCRIPTION:
In order to monitor purifying efficiency of the catalyzer,
the rear oxygen sensor sends a signal to the ECM.
Refer to“J: DTC P0130—FRONT OXYGEN SENSOR
CIRCUIT MALFUNCTION—[T11J0]”.
DTC DETECTING CONDITION:
Two consecutive trips with fault
185
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11. Diagnostics Chart with Trouble Code
Page 1392 of 2248
1.Check DTC P0130 on display.
No
Ye s
2.Check failure cause of P0130.
3.Check rear oxygen sensor data.
4.Check harness.
5.Check exhaust system.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
[T3D0] and [T3E0].>
WIRING DIAGRAM:
LHD model
OBD0221
186
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code