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:
Turn Signal Multifunction Switch Replacement
..
Turn Signal Multifunction Switch Replacement
Callout
Component Name
Preliminary Procedure
Remove the upper trim cover and the lower trim cover from the steering
column. Refer to Steering Column Lower Trim Cover Replacemen ...
Heater and Air Conditioning Control Replacement
Heater and Air Conditioning Control Replacement
Callout
Component Name
Preliminary Procedures
Remove I/P center bezel. Refer to Instrument Panel Center Molding
Replacement.
Remove front floor shifter bezel. Refer to Front ...
Park - Engine Running (Gen 1)
When the gear selector lever is in the Park (P) position, fluid is drawn into
the pump through the transmission fluid filter assembly. Line pressure is then directed
to the following valves:
Fluid Pressure Directed in Preparation
for a Shift
Manual Valve
Mechanically controlled ...
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