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:

Interior Care
To prevent dirt particle abrasions, regularly clean the vehicle's interior. Immediately remove any soils. Note that newspapers or dark garments that can transfer color to home furnishings can also permanently transfer color to the vehicle's interior. Use a soft bristle brush to remove d ...

Dome Lamp Bulb Replacement
Dome Lamp Bulb Replacement Callout Component Name Preliminary Procedure Remove the windshield header courtesy lamp. Refer to Windshield Header Courtesy Lamp Replacement 1 Dome Lamp Bulb ...

Camshaft Sprocket Removal
Loosen the intake camshaft sprocket bolt (1) while holding the hexagon of intake camshaft (2) with a wrench. Remove the intake camshaft sprocket bolt (1) and the intake camshaft position exciter wheel (2). Remove the intake camshaft sprocket ( ...

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