DTC P0130: Ho2S Circuit - Sensor 1 (SOHC): Description
WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
When the vehicle is first started, the engine operates in an open loop operation, ignoring the Heated Oxygen Sensor (HO2S) signal and calculating the air/fuel ratio based on inputs from the Engine Coolant Temperature (ECT), Throttle Position (TP), and Manifold Absolute Pressure (MAP) sensors only. The Powertrain Control Module (PCM) will begin by using the Heated Oxygen Sensor (HO2S) signal in order to control the fuel delivery in a closed loop when the following conditions are met:
- The engine has run a minimum amount of time based on ECT at engine start-up.
- The HO2S 1 has a varying voltage output. This voltage output indicates that the HO2S is hot enough to operate properly.
- The ECT has increased a minimum amount based on the ECT at engine start-up.