Automatic transmission selector lock solenoid
The automatic transmission selector lock solenoid is a small electronic device located in the automatic transmission housing. It is designed to control the shift interlock and ensure proper operation of the ignition interlock system.
Functions
* Locks the gear shift lever in the Park (P) position when the ignition is turned off.
* Unlocks the gear shift lever when the ignition is turned on and the brake pedal is depressed.
* Provides an ignition lock, preventing the engine from starting unless the shift lever is in the Park (P) or Neutral (N) position.
Operating principle
When the ignition is turned off, the transmission lock solenoid is activated and connects a pin to the shift lever lock mechanism. This locks the lever in the Park (P) position.
When the ignition is turned on and the brake pedal is depressed, the shift lock solenoid disengages and disengages the pin from the lock mechanism. This unlocks the gear lever, allowing the driver to change gears.
The interlock solenoid is also connected to the ignition interlock system. If the shift lever is not in Park (P) or Neutral (N), the solenoid will bypass the ignition circuit, preventing the engine from starting.
Malfunctions
A faulty automatic transmission lock solenoid can cause the following problems:
* Inability to shift gear lever out of Park (P) position.
* Difficulty shifting gears.
* Inability to start the engine.
Diagnostics and replacement
Diagnosing a faulty automatic transmission lock solenoid may require using an OBDII diagnostic scanner and checking the solenoid’s wiring and connectors.
If diagnostics confirm that the solenoid is faulty, it must be replaced. The replacement process may vary depending on the model and year of the vehicle. However, in general, it involves removing the transmission housing, removing the solenoid, and installing a new solenoid.
It is recommended that you contact a qualified mechanic to replace the automatic transmission selector lock solenoid.