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Trip Indicator The Trip is essential for running monitors and extinguishing the MIL. In OBD II terms, a trip is a set of vehicle Good Trip The Good Trip counters are as follows: • Specific Good Trip • Fuel System Good Trip • Misfire Good Trip • Alternate Good Trip (appears as a Global Good Trip on DRB III) • Comprehensive Components • Major Monitor • Warm-Up Cycles Specific Good Trip The term Good Trip has different meanings depending on the circumstances: • If the MIL is OFF, a trip is defined as when the Oxygen Sensor Monitor and the Catalyst Monitor have been • If the MIL is ON and a DTC was set by the Fuel Monitor or Misfire Monitor (both continuous monitors), the • If the MIL is ON and a DTC was set by a Task Manager commanded once-per-trip monitor (such as the Oxy- • If the MIL is ON and any other emissions DTC was set (not an OBD II monitor), a good trip occurs when the Fuel System Good Trip To count a good trip (three required) and turn off the MIL, the following conditions must occur: • Engine in closed loop • Operating in Similar Conditions Window • Short Term multiplied by Long Term less than threshold • Less than threshold for a predetermined time If all of the previous criteria are met, the PCM will count a good trip (three required) and turn off the MIL. Misfire Good Trip If the following conditions are met the PCM will count one good trip (three required) in order to turn off the MIL: • Operating in Similar Condition Window • 1000 engine revolutions with no misfire Warm-Up Cycles Once the MIL has been extinguished by the Good Trip Counter, the PCM automatically switches to a Warm-Up • Engine coolant temperature must start below and rise above 160° F • Engine coolant temperature must rise by 40° F • No further faults occur Freeze Frame Data Storage Once a failure occurs, the Task Manager records several engine operating conditions and stores it in a Freeze The data stored in Freeze Frame is usually recorded when a system fails the first time for two trip faults. Freeze 25 - 8 EMISSIONS CONTROL DR/DH |