HEATED OXYGEN SENSORS MONITOR DRIVE CYCLE

Upstream (Universal) oxygen sensors.

  • Engine OFF; cooling fans inoperative > 20 seconds.
  • Start engine and bring to normal operating temperature > 82 C (180 F).
  • Drive the vehicle between 3000 4000 rpm at a steady speed. Lift foot completely off accelerator and coast to a stop within 30 seconds. Do not touch accelerator pedal for 4 seconds after coming to a stop.
  • Repeat step above.
  • Idle engine for 11 minutes.

 

Downstream oxygen sensors:

  • 1 Start engine and bring to normal operating temperature > 82 C (180 F).
  • 2 Drive the vehicle steadily between 48 97 km/h (30 60 mph) for 10 minutes.
  • 3 Drive the vehicle above 3000 rpm in 4th gear at a steady speed. Lift foot completely off accelerator and coast for 30 seconds.

 

Oxygen sensor heaters:

  • Start engine and bring to normal operating temperature > 82 C (180 F).
  • 2 Idle engine for 3 minutes.

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