Chevrolet Sonic Repair Manual: Transmission Adaptive Functions
The 6T30/40/45/50 transmission utilizes a line pressure control system during upshifts to compensate for the normal wear of transmission components. As the apply components within the transmission wear or change over time, shift time (the time required to apply a clutch) increase or decreases. In order to compensate for these changes, the transmission control module (TCM) adjusts the pressure commands to the various PC solenoids, to maintain the originally calibrated shift timing. The automatic adjusting process is referred to as ?daptive learning?and it is used to ensure consistent shift feel plus increase transmission durability. The TCM monitors the A/T input speed sensor (ISS) and the A/T output speed sensor (OSS) during commanded shifts to determine if a shift is occurring too fast (harsh) or too slow (soft) and adjusts the corresponding pressure control (PC) solenoid signal to maintain the set shift feel.
The purpose of the adapt function is to automatically compensate the shift quality for the various vehicle shift control systems. The adapt function is a continuous process that will help to maintain optimal shift quality throughout the life of the vehicle.
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF
in each shift lever position.
For automatic transmission vehicles, the ignition should turn to LOCK/OFF
onl ...
Transmission Assemble (Gen 1)
Special Tools
3-9506289 Universal Adapter
R-0007758 Holding Fixture
S-9407197 Differential Rotating Tool
S-9407198 Differential Bearing Race Wrench
For equivalent regional tools, refer ...
Other materials:
Radio with Touchscreen
The infotainment system can play music or movies by connecting an auxiliary device
to the USB port, if equipped.
USB Support
USB Supported Devices
USB Flash Drives
Portable USB Hard Drives
2G-5G iPod nano®
1G-3G iPod touch®
120GB/160GB iPod classic®
3G/3GS/4/4S iPhone®
Not a ...
Rear Wiper Blade Replacement
1. Pull the wiper arm a short distance away from the glass (1).
2. Pull the blade out from the arm (2).
It may require extra effort to remove the old blade.
3. Once the blade pin disengages from the wiper arm, remove the wiper blade by
sliding the pin out of the guide hole.
4. Reverse the ...
Tire Pressure Indicator Sensor Replacement
Removal Procedure
Raise the vehicle on a suitable support. Refer to Lifting and Jacking
the Vehicle.
Remove the tire/wheel assembly from the vehicle. Refer to Tire and Wheel
Removal and Installation.
Dismount the tire from the rim. Refer to Tire Dismounting and Mounting. ...
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