Four Conditions For Diagnostics

The PCM has 4 different conditions for diagnostics.

1. Trip
   
   When all diagnostic functions have been completed.
2. Drive Cycle
   
   Begins 15 seconds after the engine starts and finishes when the engine is switched off.
3. Warm-Up Cycle
   
   Begins when the engine starts and engine coolant temperature is below 104°F (40°C), and finishes up when the engine temperature is above 183.2°F (84°C).
4. Time
   
   Some diagnostics are carried out a set amount of time after a particular occurrence (for example when vehicle speed is above 14.3 MPH).