Theory Of Operation
WARNING: This page is about a different car, the 2016 RAM 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The purpose of the diagnostic is to check Linear Solenoid 1 valve for functional failures by monitoring the clutch engagement time during the neutral to drive shift event for valve stuck on conditions. The Transmission Control Module (TCM) controls each linear solenoid via pulse-width modulation for precise control of the hydraulic circuit pressure. The solenoid will be disabled by a ground interrupt switch when any transmission solenoid failure is detected. The TCM detects a valve stuck on condition by measuring the clutch engagement time between the commanded pressure and the resulting change in turbine speed. If a valve stuck on condition is detected for a calibrated number of occurrences, a DTC will be set.