Component Inspection

Engine

Engine Control - P2243 O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor 1) - Component Inspection

HO2S Inspection

1. Visually/physically inspect the HO2S for the following conditions:
- Ensure that the HO2S is securely installed. (Pigtail and wiring harness not making contact with the exhaust pipe)
- Check for corrosion on terminals and terminal tension (at the HO2S and at the ECM)
- Front HO2S for silicon contamination. This contamination will be indicated by a white powdery coating on the portion of the sensor exposed to the exhaust stream and this will result in a but false (high) voltage signal
- Fuel, engine coolant or oil contamination
- Use of improper sealant
- If contamination is evident on the HO2S, Fix the source of the sensor contamination before replacing the sensor to prevent future contamination. Go to "Verification of Vehicle Repair" procedure.
2. Warm up the engine to normal operating temperature and let it idle.
3. Connect Scantool and monitor the "O2 SNSR VOL.-B1/S1" parameter on the Scantool data list.

Specification : Refer to "Signal Waveform & Data" in the "General Information" procedure
- Front HO2S (O2 SNSR VOL.-B1/S1) : Approx. 1.5 - 2.0 V with idle after warm up
Sensor voltage decrease during engine acceleration and increase during engine deceleration
Approx. 3.0 - 4.0 V when fuel cut

4. Was a problem found in any of the above areas?