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:
Checking Engine Oil
It is a good idea to check the engine oil level at each fuel fill. In order to
get an accurate reading, the oil must be warm and the vehicle must be on level ground.
The engine oil dipstick handle is a loop. See Engine Compartment Overview for the location of the engine oil dipstick.
1. I ...
Evaporative Emission Canister Replacement (Steel Tank)
Removal Procedure
Remove the evaporative emission canister bracket fasteners (1).
Disconnect the purge solenoid valve electrical connector (1).
Disconnect the evaporative emission canister vent hose (2).
Disconnect the evaporative emission c ...
Secondary Air Injection Pump Pipe Replacement
Secondary Air Injection Pump Pipe Replacement
Callout
Component Name
1
Hose Retainer (QTY:2)
Note: Squeeze the retainer on opposite sides to release.
2
Secondary Air Injection ...
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