Grand Marquis V8-4.6L Flex Fuel (2010)
Brake Switch - TCC: Description and Operation
Brake Pressure Switch
ENGINE CONTROL COMPONENTS
Brake Pressure Switch
The brake pressure switch is used for vehicle speed control deactivation. A normally closed switch supplies battery positive (B+) voltage to the PCM
when the brake pedal is not applied. When the brake pedal is applied, the normally closed switch opens and power is removed from the PCM.
On some applications the normally closed brake pressure switch, along with the normally open BPP switch, are used for a brake rationality test within
the PCM. The PCM misfire monitor profile learn function may be disabled if a brake switch concern occurs. If one or both brake pedal inputs to the
PCM is not changing states as expected, a diagnostic trouble code (DTC) is set by the PCM strategy.
