Chevrolet Sonic manuals

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:

Windshield Washer Pump Replacement
Windshield Washer Pump Replacement Callout Component Name Preliminary Procedure Remove the front left front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement. 1 Windshield Washer Pum ...

Brake Rotor Surface and Wear Inspection
Warning: Refer to Brake Dust Warning. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake Pads Replacement. Clean the friction surfaces of the brake rotor with denatured alcohol, or ...

Tires and Wheels Description and Operation
There are two types of tire and wheel balancing: static and dynamic. Static balance is the equal distribution of weight around the wheel. Assemblies that are statically unbalanced cause a bouncing action called wheel tramp. This condition may eventually cause uneven tire wear. ...

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