Monitoring Function

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Fig 1: Throttle Position Sensor Voltage Chart

Courtesy of BMW OF NORTH AMERICA, INC.

First the voltage range of both sensors is checked. If they are under or over a certain voltage, the corresponded fault code is set.

If the voltage falls remains between the Min / Max value (meaning there are no errors), then a rationality check is performed. This means, that Sensor 1 + 2 of each bank must measure approx. the same butterfly valve position. If this is not the case, then a P-Code is stored and the "check engine light" indicator bit is set.