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Dodge Durango
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Emission Control Systems » On-board diagnostics
Trip definition

OPERATION

The term "Trip" has different meanings depending on what the circumstances are. If the MIL (Malfunction Indicator Lamp) is OFF, a Trip is defined as when the Oxygen Sensor Monitor and the Catalyst Monitor have been completed in the same drive cycle.

When any Emission DTC is set, the MIL on the dash is turned ON. When the MIL is ON, it takes 3 good trips to turn the MIL OFF. In this case, it depends on what type of DTC is set to know what a "Trip" is.

For the Fuel Monitor or Mis-Fire Monitor (continuous monitor), the vehicle must be operated in the "Similar Condition Window" for a specified amount of time to be considered a Good Trip.

If a Non-Contiuous OBDII Monitor, such as:

  • Oxygen Sensor
  • Catalyst Monitor
  • Purge Flow Monitor
  • Leak Detection Pump Monitor (if equipped)
  • EGR Monitor (if equipped)
  • Oxygen Sensor Heater Monitor

fails twice in a row and turns ON the MIL, re-running that monitor which previously failed, on the next start-up and passing the monitor is considered to be a Good Trip.

If any other Emission DTC is set (not an OBDII Monitor), a Good Trip is considered to be when the Oxygen Sensor Monitor and Catalyst Monitor have been completed; or 2 Minutes of engine run time if the Oxygen Sensor Monitor or Catalyst Monitor have been stopped from running.

It can take up to 2 Failures in a row to turn on the MIL. After the MIL is ON, it takes 3 Good Trips to turn the MIL OFF. After the MIL is OFF, the PCM will self-erase the DTC after 40 Warm-up cycles. A Warm-up cycle is counted when the ECT (Engine Coolant Temperature Sensor) has crossed 160F and has risen by at least 40F since the engine has been started.

    More about «On-board diagnostics»:

    Emission system

    Malfunction indicator lamp (mil)

    State display test mode

    Circuit actuation test mode

    Diagnostic trouble codes

    Diagnostic trouble code descriptions

    Task manager-gasoline powered engines only

    Monitored systems

    Trip definition

    Component monitors

    Non-monitored circuits

    High and low limits

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