Transmission Solenoid And TRS Assembly - Operation

OPERATION

SOLENOIDS

Solenoids are used to control the L/R, 2C, 4C, OD, and UD friction elements. The reverse clutch is controlled by line pressure and the position of the manual valve in the valve body. All the solenoids are contained within the Solenoid and Pressure Switch Assembly. The 2C, 4C, and UD solenoids are dedicated to those specific clutches (respectively). The L/R solenoid controls either the L/R clutch (in 1st gear and Park/Neutral) or the torque converter clutch (TCC), in 2nd and higher gears. The position of the solenoid switch valve (SSV) determines which element the L/R solenoid is controlling. The Multi-Select (MS) solenoid controls either the OD clutch (in Drive gears) or the L/R clutch (in Reverse). The position of the manual valve determines which element the MS solenoid is controlling.

The solenoids receive electrical power from the Transmission Control Relay through a single wire. The TCM energizes or operates the solenoids individually by grounding the return wire of the solenoid as necessary. When a solenoid is energized, the solenoid valve shifts, and a fluid passage is opened or closed (vented or applied), depending on its default operating state. The result is an apply or release of a frictional element.

The MS and UD solenoids are normally applied (they supply hydraulic pressure to the clutch when they are electrically "off"), which provides appropriate transmission limp-in operation in the event of an electrical failure.

The continuity of the solenoids and circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs.

PRESSURE SWITCHES

The TCM relies on five pressure switches to monitor fluid pressure in the L/R, 2C, 4C, UD, and OD hydraulic circuits. The primary purpose of these switches is to help the TCM detect when clutch circuit hydraulic failures occur. The switches close at 23 psi and open at 11 psi, and simply indicate whether or not pressure exists. The switches are continuously monitored by the TCM for the correct states (open or closed) in each gear as shown in the following charts and 545RFE PRESSURE SWITCH STATES:

545RFE PRESSURE SWITCH STATES






A Diagnostic Trouble Code (DTC) will set if the TCM senses any switch open or closed at the wrong time in a given gear.