DTC Troubleshooting

DTC Troubleshooting: P2270, P2272

DTC P2270:

Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean

DTC P2272:

Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- Information marked with an asterisk (*) applies to the front bank (Bank 2).

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

4. Test-drive under these conditions:

- Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
- Transmission in D
- Engine speed between 1,500-3,700 rpm
- Drive 35 seconds or more

5. Monitor the OBD STATUS for DTC P2270 and/or P2272*in the DTCs MENU with the HDS.

Does the HDS indicate FAILED?

YES -

Go to step 6.

NO -

If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the HDS indicates NOT COMPLETED, go to step 3 and recheck.

6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

7. Replace the secondary HO2S (Sensor 2) Secondary HO2S Replacement.

8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

9. Reset the PCM with the HDS.

10. Do the PCM idle learn procedure PCM Idle Learn Procedure.

11. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

12. Test-drive under these conditions:

- Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
- Transmission in D
- Engine speed between 1,500-3,700 rpm
- Drive 35 seconds or more

13. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2270 and/or P2272*indicated?

YES -

Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1.

NO -

Go to step 14.

14. Monitor the OBD STATUS for DTC P2270 and/or P2272*in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 13, go to the indicated DTC's troubleshooting.�

NO -

If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 11.