Alternator charging voltage deviation

Compares two compression measurement results and returns their relative difference; it does not determine the cause of the difference.

Compares measured speed with a reference speed and returns the absolute percentage deviation.

Calculates the difference between open-circuit and loaded voltage without automatically assessing battery condition.

Adds short-term and long-term fuel trim; the result is not interpreted as a specific fault.

Calculates average coolant temperature change rate in K/min from two temperatures and elapsed time.

Estimates ideal runtime from battery capacity and drain current without accounting for operating conditions.