For 1990-2009 cars

#### Transmission Fluid Pressure (TFP) Switch Logic

Gear | TFP Switch States
--- | ---
TFP SW1 | *TFP SW3 | TFP SW4 | TFP SW5
Park | High | Low | Low | Low
Reverse | Low | Low | Low | Low
Neutral | High | Low | Low | Low
Drive 1st - Engine Braking | High | High | Low | Low
Drive 1st | High | High | Low | High
Drive 2nd | High | Low | Low | High
Drive 3rd | Low | High | Low | High
Drive 4th | High | High | Low | Low
Drive 5th | Low | High | High | Low
Drive 6th | High | High | High | Low
Drive 6th (Possible additional gear state) | High | Low | High | Low
High = 12V (Switch Open or Pressurized) Low = 0V (Switch Closed or No Pressure) Note: All TFP switches are normally closed (NC) *TFP switch 2 does not exist