Chevrolet Sonic Repair Manual: Drive Range, Third 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, the throttle position sensor and other vehicle sensors to determine the precise moment to command OFF the normally-low 26 pressure control solenoid. At the same time the 35R pressure control solenoid is also commanded ON to regulate 3-5 clutch apply, and the transmission shifts into Third gear. The manual valve remains in the Drive (D) position and line pressure continues to feed the drive fluid circuit.
- 3-5-Reverse Clutch Applies
-
35R Pressure Control (PC) Solenoid
The 35R PC solenoid is commanded ON, allowing actuator feed limit fluid to enter the PCS 35 reverse clutch fluid circuit. PCS 35 reverse clutch fluid is routed through orifice #26 to the 3-5-reverse clutch regulator valve.
3-5-Reverse Clutch Regulator Valve
PCS 35 reverse clutch fluid, at the 3-5-reverse clutch regulator valve, opposes 3-5-reverse clutch regulator valve spring force and 35 reverse clutch feedback fluid pressure to regulate 35 reverse clutch feed/drive 1-6 pressure into the 35 reverse clutch circuit. The 35 reverse clutch fluid is then routed through orifice #25 to the 3-5-reverse clutch assembly, through orifice #6 to the spring end of the 3-5-reverse clutch regulator valve and through orifice #33 to the #4 ball check valve.
3-5-Reverse Clutch
35 reverse clutch fluid enters the 3-5-reverse and 4-5-6 clutch housing assembly to move the 3-5-reverse clutch piston against spring force and exhaust backfill fluid pressure to apply the 3-5-reverse clutch plates.
#4 Ball Check Valve
35 reverse clutch feed fluid unseats the #4 ball check valve, allowing excess pressure to pass into the actuator feed limit circuit. This helps to control clutch apply fluid pressure and clutch apply feel.
Accumulator
PCS 35 reverse clutch fluid is also routed to an accumulator valve. The accumulator valve is used to dampen any pressure irregularities occurring in the PCS 35 reverse clutch fluid circuit. This helps to control clutch apply fluid pressure and clutch apply feel.
- 2-6 Clutch Releases
-
26 Pressure Control (PC) Solenoid
The 26 PC solenoid is commanded OFF, allowing PCS 26 clutch fluid to exhaust from the 2-6 clutch regulator valve.
2-6 Clutch Regulator Valve
2-6 clutch regulator valve spring force moves the valve to the released position, allowing 26 clutch fluid from the 2-6 clutch to pass through the valve and enter the exhaust backfill fluid circuit.
2-6 Clutch
2-6 clutch spring force moves the 2-6 clutch piston to release the 2-6 clutch plates and force 26 clutch fluid to exhaust from the transmission case assembly. The exhausting 26 clutch fluid pressure is routed to the 2-6 clutch regulator valve where it enters the exhaust backfill fluid circuit.
- Drive Range, Third Gear ?#8201;Gen 2/Hybrid
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Drive Range, Third 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 ...
Drive Sprocket, Driven Sprocket, and Drive Link Cleaning and Inspection
Drive Sprocket, Driven Sprocket, and Drive Link Cleaning and Inspection
Callout
Component Name
1
Drive Sprocket Thrust W ...
Other materials:
Seat Adjustment
Manual Seats
To adjust a manual seat:
1. Pull the handle at the front of the seat.
2. Slide the seat to the desired position and release the handle.
3. Try to move the seat back and forth to be sure it is locked in place.
See Seat Adjustment.
Seat Height Adjuster
If available, move the le ...
Instrument Panel Lower Airbag Replacement - Passenger Side
Instrument Panel Lower Airbag Replacement - Passenger Side
Callout
Component Name
Warning: Refer to SIR Inflator Module Handling and Storage
Warning.
Warning: Refer to SIR Warning.
Preliminary Procedu ...
Fuel Pressure Measurement
Special Tools
EN 34730?E1 Pressure Tester
For equivalent regional tools, refer to Special Tools
Warning: Gasoline or gasoline vapors are highly flammable. A fire
could occur if an ignition source is present. Never drain or store gasoline
or diesel fuel in an open con ...
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