Chevrolet Sonic Repair Manual: Drive Range, Second Gear (Gen 1)
As vehicle speed increases and operating conditions become appropriate, the transmission control module (TCM) processes input signals from the automatic transmission input and output speed sensors, the throttle position sensor and other vehicle sensors to determine the precise moment to command ON the normally-low 2-6 pressure control solenoid 4 and shift the transmission into Second gear. The manual valve remains in the Drive (D) position and line pressure continues to feed the drive fluid circuit.
- 2-6 Clutch Applies
-
26 Pressure Control (PC) Solenoid 4
The 26 PC solenoid 4 is commanded ON, allowing actuator feed limit fluid to enter the PCS 26 clutch fluid circuit. PCS 26 clutch fluid is then routed through orifice #24 to the 2-6 clutch regulator valve.
2-6 Clutch Regulator Valve
PCS 26 clutch fluid, at the 2-6 clutch regulator valve, opposes 2-6 clutch regulator valve spring force and orificed 26 clutch fluid pressure to regulate drive fluid pressure into the 26 clutch circuit. 26 clutch fluid is then routed through orifice #37 to the 2-6 clutch assembly in the transmission case, and through orifice #4 to the spring end of the 2-6 clutch regulator valve. With the 2-6 clutch regulator valve in this position, PS2 fluid is allowed to exhaust and the normally-closed PS2 switch closes.
2-6 Clutch
The 26 clutch fluid from the 2-6 clutch regulator valve is routed through the transmission case to the 2-6 clutch piston assembly. The 26 clutch fluid pressure moves the piston against 2-6 clutch spring force to apply the 2-6 clutch plates.
- Drive Range, Second Gear
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Drive Range, First Gear Engine Braking (Gen 2)
Note: Some models of the 6T30/40/45/50 automatic transmission are equipped with
an electric auxiliary fluid pump for use in hybrid vehicles (BAS+). Hybrid vehicles
do not require internal combusti ...
Drive Range, Second Gear (Gen 2)
As vehicle speed increases and operating conditions become appropriate, the transmission
control module (TCM) processes input signals from the automatic transmission input
and output speed sensors ...
Other materials:
Tire Pressure Indicator Sensor Learn
Special Tools
EL-46079 Tire Pressure Monitor Diagnostic Tool
EL-50448 Tire Pressure Monitor Sensor Activation Tool
For equivalent regional tools, refer to Special Tools.
Learn Mode Description
The tire pressure monitor system uses the instrument cluster, body control
module ...
Rear Seat Head Restraint Replacement
Rear Seat Head Restraint Replacement
Callout
Component Name
1
Rear Seat Head Restraint
Preliminary Procedures
Depress the large button on the head restraint guide and raise the
head restraint to the full up p ...
Engine Front Cover and Oil Pump Installation
Special Tools
EN-952 Fixing Pin
EN-953-A Fixing Tool
EN-49977-100 Transmitter Disc Fixation
EN-49977-200 Fixing Tool
For equivalent regional tools, refer to Special Tools.
Note: Mind the guide sleeves when installing engine front cover.
Install the engine front ...
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