Ranger 4WD V6-183 3.0L (1993)
Brake On/Off (BOO) Switch: Description and Operation
PURPOSE
The Brake On Off (BOO) signal is an input to the Powertrain Control Module (PCM), informing it of brake operation. The PCM uses this data to
modify the operation of the torque converter clutch (if equipped), A/C compressor (if equipped), and idle speed during periods of deceleration,
and idle with the brakes applied.
Stoplight Switch
OPERATION
The PCM receives a signal (battery voltage) directly from the stoplamp switch when the the brake pedal is applied.
RELATED TROUBLE CODES
DTC 74/536 - BOO signal did not cycle high and low when the brake pedal was depressed during the Key On Engine Running (KOER) self-test.
