DTC P2270 / P2271
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P2270: O2 Sensor Signal Biased / Stuck Lean (Sensor2) Output voltages of A/F sensor-2 signal circuits are lower than specified value. (3 D/C detecting logic) |
•A/F sensor-2 and/or its circuit
•ECM |
|
P2271: O2 Sensor Signal Biased / Stuck Rich (Sensor2) Any of the following conditions is met.
•Output voltages of A/F sensor-2 signal circuits are higher than specified value with engine running. (3 D/C detecting logic)•Output voltage of A/F sensor-2 signal circuit higher than modeled voltage of A/F sensor-2 signal circuit by specified value when engine running. |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A3: | A/F sensor-2 signal circuit (IPN) | B2: | A/F sensor-2 heater drive circuit |
| A1: | A/F sensor-2 signal circuit (RT) | A4: | A/F sensor-2 signal circuit (RE+) | 1. | ECM |
| A2: | A/F sensor-2 signal circuit (APE) | B1: | A/F sensor-2 heater power supply circuit | 2. | A/F sensor-2 |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
A/F sensor-2 signal circuit check
1)Check “A1”, “A2”, “A3” and “A4” circuits according to Step 2 of A/F Sensor-2 Check:D16AA.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
A/F sensor-2 check
1)Check A/F sensor-2.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace A/F sensor-2.
|