ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC P2270 O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 2
DTC detecting condition:
Detected when two consecutive driving cycles with fault occur.
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">
.
Wiring diagram:
Engine electrical system Engine Electrical System">
STEP | CHECK | YES | NO |
1.CHECK REAR OXYGEN SENSOR CONNECTOR.
Has water entered the connector?
Completely remove any water inside.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2270 O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 2">Go to Step 2.
2.CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connector from rear oxygen sensor.
4) Measure the resistance of harness between ECM connector and rear oxygen sensor connector.
Connector & terminal
(E135) No. 30 — (E25) No. 4:
(E136) No. 21 — (E25) No. 3:
Is the resistance less than 1 ??
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2270 O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 2">Go to Step 3.
Repair the open circuit of harness between ECM connector and rear oxygen sensor connector.
3.CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between rear oxygen sensor connector and engine ground.
Connector & terminal
(E25) No. 3 (+) — Engine ground (−):
Is the voltage 0.15 V or more?
Repair the short circuit to power in the harness between ECM connector and rear oxygen sensor connector.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2270 O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 2">Go to Step 4.
4.CHECK EXHAUST SYSTEM.
Check exhaust system parts.
NOTE:
Check the following items.
• Looseness and improper fitting of exhaust system parts
• Damage (crack, hole etc.) of parts
• Damage (crack, hole etc.) between front oxygen (A/F) sensor and rear oxygen sensor
Is there any fault in exhaust system?
Repair or replace faulty parts.
Replace the rear oxygen sensor. Rear Oxygen Sensor">
1. OUTLINE OF DIAGNOSIS
Detect the stuck of rear oxygen sensor voltage in lean state.
When rear oxygen sensor voltage remains below the threshold value for predetermined time, diagnosis interrupts target air fuel ratio for control and raises output voltage.
Judge as NG detecting the stuck in lean state when rear oxygen sensor voltage remains below the threshold value even after the interrupt control.
2. COMPONENT DESCRIPTION
(A) | Electromotive force | (B) | Air fuel ratio | (C) | Lean |
(D) | Rich | (E) | Theoretical air fuel ratio | (F) | Comparative voltage |
3. EXECUTION CONDITION
Secondary parameters | Execution condition |
Battery voltage | ≥ 10.9 V |
Sub feedback | In operation |
Amount of intake air | ≥ 8 g/s (0.28 oz/s) |
Estimated temperature of the rear oxygen sensor element | ≥ 500 °C (932 °F) (CVT model) ≥ 500 °C (932 °F) (MT model) |
Enable conditions at interrupt control are as follows | |
Continuous time when rear oxygen sensor output voltage is less than 0.55 V | ≥ 5 s (CVT model) ≥ 15 s (MT model) |
Air fuel ratio reduced from target air fuel ratio | = Value of Map |
Output voltage of rear oxygen sensor V | 0.000 | 0.150 | 0.200 | 0.400 | 0.600 |
Air fuel ratio reduced from target air fuel ratio % | 15 | 15 | 4 | 4 | 4 |
Output voltage of rear oxygen sensor V | 0.000 | 0.150 | 0.200 | 0.400 | 0.600 |
Air fuel ratio reduced from target air fuel ratio % | 15 | 15 | 4 | 4 | 4 |
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once after the enable conditions have been established.
5. DIAGNOSTIC METHOD
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Malfunction Criteria | Threshold Value |
Output voltage of rear oxygen sensor | < 0.55 V |
Time needed for diagnosis:
• 15 s (CVT model)
• 25 s (MT model)
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Removal
SECURITY AND LOCKS > ReceiverREMOVALNOTE:Except for model with keyless entry1. Disconnect the ground cable from battery. NOTE">2. Remove the trim panel - rear apron LH. Rear Quarter Trim > REMOVAL">3. Remove the receiver assembly.(1) Disconnect the connector.(2) Remove the bo ...
Bulb chart
NOTE
Lights A and B are the LED (Light Emitting Diode) type. Consult your
SUBARU dealer for replacement.
Wattage
Bulb No.
1) High beam headlight
12V-60W
HB3
2) Low beam headlight
Models with HID light
Models with halogen light
...
Installation
REAR SUSPENSION > Upper ArmINSTALLATIONCAUTION:• Use a new self-locking nut.• Always tighten the bushing when the arm is positioned in the state where the vehicle is at curb weight and the wheels are in full contact with the ground.1. Before installation, inspect the following items a ...