P2270

DTC P2270: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean (2004 - 2005 models)

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.

1. Reset the ECM.
2. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on.
3. Test-drive under these conditions:
- Transmission in 6th gear.
- Vehicle speed at 65 mph (105 km/h); steady speed for at least 1 minute.
- While driving, decelerate (with the throttle fully closed) for 4 seconds, then open the throttle slowly, and cruise 40 seconds or more.

4. Check the secondary HO2S (Sensor 2) output voltage with a scan tool or the HDS.

Does the voltage stay at 0.0 - 0.6 V?

YES - Replace the secondary HO2S (Sensor 2).

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and at the ECM.