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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Introduction (2 Of 2)) >> Description and Operation >> Neutral - Engine Running >> Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly

Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: In Park, Reverse and Neutral the shift solenoid valves are shown energized. This is the normal operating state when the vehicle is stationary or at low vehicle speeds. However, the PCM will change the shift solenoid valve states depending on the vehicle speed. For example, if Neutral is selected when the transmission is operating in Second Gear, the shift solenoid valves will remain in a Second Gear state. However, with the manual valve blocking line pressure, the shift solenoid valve states do not affect transmission operation in Park, Reverse and Neutral.

Reverse input fluid exhausts from the TFP manual valve position switch. With no other fluid routed to it, the TFP manual valve position switch signals the PCM that the transmission is operating in either Park or Neutral.

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