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Monitor Run Process

Outlined below is the Monitor Run Process, including suggestions and tips in order to aid in the process of meeting the enabling criteria to allow any of these monitors to run.

NOTE: The most efficient order has been outlined below. The first two monitors have very similar enable criteria. It is possible that the Evaporative Leak Detection Monitor will run during the O2 Sensor Heater Monitor.
  1. O2 Sensor Heater Monitor 

    This monitor requires a cold start, usually an overnight soak or parked for at least 8 hours without the engine running. The engine coolant temperature must be within 10 degrees of ambient/battery temperature, and the sensed Ambient (outside temperature) must be between approximately 0° F and 100° F.

  2. Evaporative Leak Detection Monitor (If the vehicle is equipped with an LDP system) 

    This monitor requires a cold start, usually an overnight soak or parked for at least 8 hours without the engine running. The engine coolant temperature must be within 10 degrees of ambient/battery temperature, and the sensed Ambient (outside) Temperature must be between approximately 40° F and 90° F.

  3. Catalyst Monitor 

    The vehicle will need to be driven at highway speed for a few minutes (approximately 35 to 40 mph for 2.5L and 4.0L engines, 50 to 60 mph for all others). If the vehicle is equipped with a manual transmission, using 4th gear may assist in meeting the monitor running criteria.

  4. O2 Sensor Monitor 

    The vehicle will need to be driven for a period of time (approximately 35 to 40 mph for 2.5L and 4.0L engines, 50 to 60 mph for all others) and brought to a stop for a short period of time (with the Automatic Transmission left in Drive. The O2 Monitor will not run in Park or Neutral on an Automatic Transmission equipped vehicle).

  5. Purge Monitor 

    The Purge Free (PF) cells must update. Similar Test conditions as the O2 Sensor Monitor, that is, Normal Operating Temperature, come to a stop while leaving the Automatic Transmission in Drive (not Park or Neutral). The Purge Flow Monitor will attempt to run every OTHER Throttle Closure. If all of the parameters are met and it still does not run, with your foot firmly on the Service Brake, slightly (1/4) open the Throttle and quickly close the Throttle. This will allow the Purge Free update to happen, and then the Purge Flow Monitor will Run.

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