Part 1: Validation of the time while engine is running

The engine run time, which is calculated and used by the ECU is compared to the time received from the clock in the instrument panel.

Example: If the engine run time is > 600 seconds, but the time received from the clock in the panel is < than 180 seconds a malfunction will be stored.

Fig 1: Engine Running Time And Malfunction Detection Flow Chart

Courtesy of BMW OF NORTH AMERICA, INC.