The Pressure Switch Manifold (PSM) is a multiple-switch assembly made up of three normally open and one normally closed pressure switches. Fluid pressure is fed from Shift Valve E to the switch based on the position of the valve. The shift valve fluid pressure reflects the logic condition at the corresponding solenoid. This logic indicates the current transmission operating range to the Transmission Control Module (TCM) .
The fluid pressure switch corresponding to the shift valve is normally open (contacts not touching) when no fluid pressure is present, so that electrical current is stopped at the switch. When fluid pressure is routed to the switch, it moves the diaphragm and upper contact so that the contact element touches both the positive and ground contacts. This closes the circuit and allows current to flow from the positive contact and through the switch.
DTC P0872 is a type A DTC.
Conditions for Running the DTC
* The components are powered and ignition voltage is greater than 9V and less than 18 V.
* Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.
Conditions for Setting the DTC
DTC P0872 sets when solenoid E is commanded OFF and pressure switch E status remains ON for 2-20 seconds depending on fluid temperature.
