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Automatic Transmission - 4L80-E/4L85-E (Introduction, Service & Replacement): Maintenance Chevrolet Silverado 3500

Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic

Range SignalABC
ParkHILOWHI
ReverseLOWLOWHI
NeutralHILOWHI
D4HILOWLOW
D3HIHILOW
D2HIHIHI
D1LOWHIHI
IllegalLOWHILOW
IllegalLOWLOWLOW
LOW = 0 volts HI = Ignition voltage

Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic