Automatic Transmission Fluid Pressure Manual Valve Position Switch Assembly

The automatic Transmission Fluid Pressure (TFP) manual valve position switch assembly consists of two normally-open pressure switches. The assembly is attached to the lower control valve body. The PCM supplies ignition voltage on the two range signal circuits, signal circuit "A" and signal circuit "C". By grounding one of the switches with fluid pressure from the manual valve, the PCM detects a garage shift from PARK/NEUTRAL to REVERSE or PARK/NEUTRAL to DRIVE (D1, D2, D3, or D4). This information is used by the PCM to adjust line pressure during garage shifts.