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
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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:
Driver or Passenger Seat Back Cushion Heater Replacement
Driver or Passenger Seat Back Cushion Heater Replacement
Callout
Component Name
Warning: Refer to SIR Warning.
Preliminary Procedure
Remove the driver or passenger seat. Refer to Driver or Passenger
Seat Remov ...
Evaporative Emission Control System Description
Typical Evaporative Emission (EVAP) System Hose Routing Diagram
(1)
Evaporative Emissions (EVAP) Purge Solenoid Valve
(2)
EVAP Canister
(3)
EVAP Vapor Tube
(4)
Vapor Recirculation Tube
(5) ...
Clutch System Description and Operation
Clutch Spin Down Time
Inspect the clutch spin down time as follows:
Apply the parking brake and block the vehicle wheels.
Shift the manual transmission into NEUTRAL.
Start the engine. Run the engine at idle speed.
Engage the clutch.
Disengage the clutch. Wait 9 seconds.
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