1996 SUBARU LEGACY Ecu

OBD0191
I: DTC P0125
—INSUFFICIENT COOLANT TEMPERATURE
FOR CLOSED LOOP FUEL CONTROL
(TW
—CL)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Engine would not return to idling.
10I1Check DTC P0115 on display.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0539
159
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

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

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

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.





166
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0220
M: DTC P0136
—REAR OXYGEN SENSOR CIRCUIT
MALFUNCTION (RO2
—V)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10M1Check DTC P0130 on display.
10M2Check failure cause of P0130.
10M3Check rear oxygen sensor data.

10M4Check harness between rear oxygen sensor
and ECM connector.
10M5Check exhaust system.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.




172
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0229
N: DTC P0139
—REAR OXYGEN SENSOR CIRCUIT SLOW
RESPONSE (RO2
—R)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10N1Check DTC P0136 on display.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:

LHD Model
B2M0760
177
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0232
O: DTC P0141
—REAR OXYGEN SENSOR HEATER
CIRCUIT MALFUNCTION (RO2H)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10O1Check DTC P0135 on display.
10O2Connect Subaru Select Monitor or the OBD-II
general scan tool, and read data.
10O3Check output signal from ECM. (Using voltage
meter.)
10O4Check power supply to rear oxygen sensor.
10O5Check rear oxygen sensor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.





179
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0240
P: DTC P0170
—FUEL TRIM MALFUNCTION (FUEL)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling

Engine stalls.

Poor driving performance
10P1Check exhaust system.
10P2Check air intake system.
10P3Check fuel pressure.
10P4Check engine coolant temperature sensor.

10P5Check mass air flow sensor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.





185
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code