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switch rate must be less than 80% of the upstream rate (60% for manual transmissions). The failure percentages Enabling Conditions—The following conditions must typically be met before the PCM runs the catalyst monitor. • Accumulated drive time • Enable time • Ambient air temperature • Barometric pressure • Catalyst warm-up counter • Engine coolant temperature • Accumulated throttle position sensor • Vehicle speed • MAP • RPM • Engine in closed loop • Fuel level Pending Conditions— • Misfire DTC • Front Oxygen Sensor Response • Front Oxygen Sensor Heater Monitor • Front Oxygen Sensor Electrical • Rear Oxygen Sensor Rationality (middle check) • Rear Oxygen Sensor Heater Monitor • Rear Oxygen Sensor Electrical • Fuel System Monitor • All TPS faults • All MAP faults • All ECT sensor faults • Purge flow solenoid functionality • Purge flow solenoid electrical • All PCM self test faults • All CMP and CKP sensor faults • All injector and ignition electrical faults • Idle Air Control (IAC) motor functionality • Vehicle Speed Sensor • Brake switch • Intake air temperature Conflict—The catalyst monitor does not run if any of the following are conditions are present: • EGR Monitor in progress • Fuel system rich intrusive test in progress • EVAP Monitor in progress • Time since start is less than 60 seconds • Low fuel level • Low ambient air temperature • Ethanel content learn is taking place and the ethenal used once flag is set Suspend—The Task Manager does not mature a catalyst fault if any of the following are present: • Oxygen Sensor Monitor, Priority 1 • Upstream Oxygen Sensor Heater, Priority 1 • EGR Monitor, Priority 1 • EVAP Monitor, Priority 1 25 - 6 EMISSIONS CONTROL LX |