Monitored Systems

Trip Indicator
The Trip is essential for running monitors and extinguishing the MIL. In OBD II terms, a trip is a set of vehicle operating conditions that must be met for a specific monitor to run. All trips begin with a key cycle.

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 completed in the same drive cycle.
- If the MIL is ON and a DTC was set by the Fuel Monitor or Misfire Monitor (both continuous monitors), the vehicle must be operated in the Similar Condition Window for a specified amount of time.
- If the MIL is ON and a DTC was set by a Task Manager commanded once-per-trip monitor (such as the Oxygen Sensor Monitor, Catalyst Monitor, Purge Flow Monitor, Leak Detection Pump Monitor, EGR Monitor or Oxygen Sensor Heater Monitor), a good trip is when the monitor is passed on the next start-up.
- If the MIL is ON and any other emissions DTC was set (not an OBD II monitor), a good trip occurs when the Oxygen Sensor Monitor and Catalyst Monitor have been completed, or two minutes of engine run time if the Oxygen Sensor Monitor and Catalyst Monitor have been stopped from running.

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 Cycle Counter that can be viewed on the DRB III. Warm-Up Cycles are used to erase DTCs and Freeze Frames. Forty Warm-Up cycles must occur in order for the PCM to self-erase a DTC and Freeze Frame. A Warm-Up Cycle is defined as follows:
- Engine coolant temperature must start below and rise above 160° F
- Engine coolant temperature must rise by 40° F
- No further faults occur


Similar Conditions Window
The Similar Conditions Window displays information about engine operation during a monitor. Absolute MAP (engine load) and Engine RPM are stored in this window when a failure occurs. There are two different Similar conditions Windows: Fuel System and Misfire.

FUEL SYSTEM
- Fuel System Similar Conditions Window - An indicator that Absolute MAP When Fuel System Fail and RPM When Fuel Sys Failed are all in the same range when the failure occurred. Indicated by switching from NO to YES .
- Absolute MAP When Fuel Sys Fail - The stored MAP reading at the time of failure. Informs the user at what engine load the failure occurred.
- Absolute MAP - A live reading of engine load to aid the user in accessing the Similar Conditions Window.
- RPM When Fuel Sys Fail - The stored RPM reading at the time of failure. Informs the user at what engine RPM the failure occurred.
- Engine RPM - A live reading of engine RPM to aid the user in accessing the Similar Conditions Window.
- Adaptive Memory Factor - The PCM utilizes both Short Term Compensation and Long Term Adaptive to calculate the Adaptive Memory Factor for total fuel correction.
- Upstream O2S Volts - A live reading of the Oxygen Sensor to indicate its performance. For example, stuck lean, stuck rich, etc.
- SCW Time in Window (Similar Conditions Window Time in Window) - A timer used by the PCM that indicates that, after all Similar Conditions have been met, if there has been enough good engine running time in the SCW without failure detected. This timer is used to increment a Good Trip.
- Fuel System Good Trip Counter - A Trip Counter used to turn OFF the MIL for Fuel System DTCs. To increment a Fuel System Good Trip, the engine must be in the Similar Conditions Window, Adaptive Memory Factor must be less than calibrated threshold and the Adaptive Memory Factor must stay below that threshold for a calibrated amount of time.
- Test Done This Trip - Indicates that the monitor has already been run and completed during the current trip.

MISFIRE
- Same Misfire Warm-Up State - Indicates if the misfire occurred when the engine was warmed up (above 160° F).
- In Similar Misfire Window - An indicator that Absolute MAP When Misfire Occurred and RPM When Misfire Occurred are all in the same range when the failure occurred. Indicated by switching from NO to YES .
- Absolute MAP When Misfire Occurred - The stored MAP reading at the time of failure. Informs the user at what engine load the failure occurred.
- Absolute MAP - A live reading of engine load to aid the user in accessing the Similar Conditions Window.
- RPM When Misfire Occurred - The stored RPM reading at the time of failure. Informs the user at what engine RPM the failure occurred.
- Engine RPM - A live reading of engine RPM to aid the user in accessing the Similar Conditions Window.
- Adaptive Memory Factor - The PCM utilizes both Short Term Compensation and Long Term Adaptive to calculate the Adaptive Memory Factor for total fuel correction.
- 200 Rev Counter - Counts - 0 - 100 720 degree cycles.
- SCW Cat 200 Rev Counter - Counts when in similar conditions.
- SCW FTP 1000 Rev Counter - Counts 0 4 when in similar conditions.
- Misfire Good Trip Counter - Counts up to three to turn OFF the MIL.
- Misfire Data - Data collected during test.
- Test Done This Trip - Indicates YES when the test is done.