? If the TFP switch 4 parameter state does not change, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. The TFP Switch 4 should transition from High in 4th gear to Low in 5th gear. Observe the TFP switch 4 parameter while commanding 4th gear and then commanding 5th gear with the scan tool. Start the engine and place the transmission range selector in D6.

The TCM freezes transmission adaptive functions.Įnsure the TFT is near the temperature displayed in the Failure Records.

The TCM detects that the TFP switch 4 signal voltage remains low, 0 volts when the 1-2-3-4 clutch is commanded ON for 5.5 seconds or greater. The TCM monitors the normally closed TFP switch 4 signal circuit to determine the 1-2-3-4 clutch status. The normally low clutch pressure control (PC) solenoid 4-5 controls the transmission fluid to the 1-2-3-4 clutch. When oil pressure is present at the TFP switch 4, the switch is open, high. The TCM supplies 12 volts to the TFP switch 4 on the TFP switch 4 signal circuit the TFP switch 4 has an internal case ground. The transmission fluid pressure (TFP) switch 4 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. DTC P0877: Transmission Fluid Pressure (TFP) Switch 4 Circuit Low Voltage

88 thunderbird turbo