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Priorities • Priority 0 —Non-emissions related trouble codes • Priority 1 — One trip failure of a two trip fault for non-fuel system and non-misfire. • Priority 2 — One trip failure of a two trip fault for fuel system (rich/lean) or misfire. • Priority 3 — Two trip failure for a non-fuel system and non-misfire or matured one trip comprehensive com- • Priority 4 — Two trip failure or matured fault for fuel system (rich/lean) and misfire or one trip catalyst dam- Non-emissions related failures have no priority. One trip failures of two trip faults have low priority. Two trip failures DTC Self Erasure With one trip components or systems, the MIL is illuminated upon test failure and DTCs are stored. Two trip monitors are components requiring failure in two consecutive trips for MIL illumination. Upon failure of the After three good trips the MIL is extinguished and the Task Manager automatically switches the trip counter to a For misfire and fuel system monitors, the component must pass the test under a Similar Conditions Window in order NOTE: It is important to understand that a component does not have to fail under a similar window of oper- DTCs can be erased anytime with a diagnostic scan tool. Erasing the DTC with the scan tool erases all OBD II 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 a scan tool) • 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- 25 - 4 EMISSIONS CONTROL WK |