The Catalyst Efficiency Monitor Drive Cycle is the test sequence used by the emissions control of ECM to monitor the Catalyst(s) for proper and efficient operation. It depends on the O2 sensors being operated at the correct temperature.

Both the catalysts and the O2 sensors need to be at several hundred degrees C before they are working efficiently, the sensors have heaters built in to them to ensure that they achieve operating temperature as soon as possible.

  • Start engine and bring to normal operating temperature > 82 °C (180 °F).
  • Drive vehicle steadily between 1700 – 2500 rpm for 5 minutes.

The Catalyst Efficiency Monitor Drive Cycle tests for the HC conversion efficiency of the catalyst(s) during the driving of the vehicle and adjusts the fuel injection cycle proportionally.

source of technical information Jaguar Cars JTIS

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