Warm-Up Cycle

In addition, the execution of the diagnostic tests may also be bound by the conditions which must comprehend a warm-up cycle. A warm-up cycle consists of an engine start-up and a vehicle operation such that the coolant temperature has risen more than 4°C (40°F) from the start-up temperature, and reached a minimum temperature of 160°F. If this condition is not met during the ignition cycle, the diagnostic may not run.