19-22 19-22 Electrical System Troubleshooting Inspection 12: Inspect the O 2 sensor output . Start the engine, warm up completely, put the direction in neutral, fully open the accelerator pedal O 2 sensor voltage (I/O monitor: OX) Standard: Inspection 13: Inspect the O 2 sensor output . Start the engine, warm up completely, put the direction in neutral, fully open the accelerator pedal O 2 sensor voltage (I/O monitor: OX) Standard: Section 19 OX 0.4 V or less and 0.5 V or more alternately output OX 0.2 V or less