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The Task Manager Screen shows both a Requested MIL state and an Actual MIL state. When the MIL is Diagnostic Trouble Codes (DTCs) With OBD II, different DTC faults have different priorities according to regulations. As a result, the 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. (MIL Off) • Priority 2 — One trip failure of a two trip fault for fuel system (rich/lean) or misfire. (MIL Off) • Priority 3 — Two trip failure for a non-fuel sys- tem and non-misfire or matured one trip comprehen- • Priority 4 — Two trip failure or matured fault for fuel system (rich/lean) and misfire or one trip cat- Non-emissions related failures have no priority. One trip failures of two trip faults have low priority. 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 After three good trips the MIL is extinguished and the Task Manager automatically switches the trip For misfire and fuel system monitors, the compo- nent must pass the test under a Similar Conditions ditions Window is when engine RPM is within ±375 NOTE: It is important to understand that a compo- DTCs can be erased anytime with a DRBIII t. Erasing the DTC with the DRBIII t erases all OBD II information. The DRBIII t automatically displays a warning that erasing the DTC will also erase all Trip Indicator The Trip is essential for running monitors and extinguishing the MIL. In OBD II terms, a trip is a Good Trip • Fuel System Good Trip • Misfire Good Trip • Alternate Good Trip (appears as a Global Good Trip on DRBIII t) • Comprehensive Components • Major Monitor • Warm-Up Cycles sor and Catalyst efficiency monitors must have run Fuel System Good Trip 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 count a good trip (three required) and turn off the Misfire Good Trip count one good trip (three required) in order to turn • Operating in Similar Condition Window • 1000 engine revolutions with no misfire 25 - 20 ON-BOARD DIAGNOSTICS PL/SRT-4 TASK MANAGER (Continued) |