Chevrolet Sonic Repair Manual: Automatic Transmission Shift Lock Control Description and Operation
The automatic transmission park lock control system is a safety device that prevents an inadvertent shift out of PARK. The driver must press the brake pedal before moving the park lever out of the PARK position. The system consists of the following components:
- The automatic transmission park lock solenoid (serviced as the automatic transmission shift lock actuator), is located within the floor shift control assembly.
- The body control module, which controls the voltage supply circuit of the park lock control solenoid.
- The engine control module.
The body control module controls the voltage to the park lock control solenoid through the park lock control solenoid controlled voltage circuit. The following conditions must be met before the body control module will supply voltage to the park lock solenoid:
- The ignition is in the ON position.
- The engine control module sends an input via GMLAN serial data to the body control module indicating the transmission is in the PARK position.
- The body control module determines the brake pedal is applied according the brake pedal position.
Since the park lock control solenoid is permanently grounded, the body control module supplies voltage to the automatic transmission park lock control solenoid, unlocking the park lever allowing the driver to move the park lever out of the PARK position as the solenoid energizes. When the brake pedal is not applied, the body control module turns the control voltage output of the park lock control solenoid OFF, de-energizing the park lock control solenoid. The de-energized solenoid mechanically locks the park lever in the PARK position.
Automatic Transmission Fluid Pressure Test Hole Plug Replacement
Automatic Transmission Fluid Pressure Test Hole Plug Replacement
Callout
Component Name
1
Fluid Pressure Test Plug
...
Automatic Transmission Shift Lock Control Function Check
Warning: When you are doing this inspection, the vehicle could move
suddenly. If the vehicle moves, you or others could be injured.
Before starting this check, be sure there is enough roo ...
Other materials:
Park Brake and P (Park) Mechanism Check
Warning
When you are doing this check, the vehicle could begin to move. You or others
could be injured and property could be damaged. Make sure there is room in front
of the vehicle in case it begins to roll. Be ready to apply the regular brake at
once should the vehicle begin to move.
Park ...
Sunroof Window Seal Replacement
Removal Procedure
Remove the sunroof window panel. Refer to Sunroof Window Replacement.
Remove the seal from the window panel frame by pulling the seal away
at one point and continuing around the perimeter of the frame.
Clean around the edge of the inside surf ...
Turbocharger Replacement
Special Tools
EN-49942 Holding Wrench
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection
and Connection.
Drain the cooling system. Refer to Cooling System Draining and Fi ...
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