Workshop Repair and Service Manuals GMC SIERRA

Overdrive Range Fourth Gear - Torque Converter Clutch Applied Automatic Torque Converter Torque Converter Clutch and Lockup - part 2

This fluid pressure, inaddition to spring force and torque signal fluid pressure,regulates the exhaust of excess accumulator fluid pressure throughthe middle of the valve. This regulation helps control the 2-4 bandapply feel.

Torque Converter Clutch Applies

TCC Solenoid Valve

When operating conditions are appropriate, the PCM energizesthe normally open TCC solenoid valve. This closes the solenoid,blocks the converter feed fluid from exhausting, and createspressure in the converter feed fluid circuit at the converterclutch apply valve and TCC solenoid valve.

Converter Clutch Apply Valve

Converter feed fluid pressure moves the valve against springforce and into the apply position. In this position, release fluidis open to an exhaust port, and regulated apply fluid fills theapply fluid circuit. Converter feed fluid is routed through theconverter clutch apply valve to feed the cooler fluidcircuit.

Torque Converter

Release fluid from behind the pressure plate exhausts throughthe end of the turbine shaft. Apply fluid pressure is routedbetween the converter hub and stator shaft where it enters thetorque converter. This fluid applies the converter clutch againstthe converter cover and keeps the converter filled withfluid.

TCC Apply Checkball (#9)

Release fluid, exhausting from the converter, seats the#9-checkball located in the end of the turbine shaft,and is orificed around the ball. Orificing the exhausting releasefluid controls the converter clutch apply rate, along with theTCC-PWM solenoid valve.

TCC-PWM Solenoid Valve

The torque converter clutch pulse width modulation(TCC-PWM) solenoid valve controls the regulated applyvalve position. This is done through the use of pulse widthmodulation (duty cycle operation). The solenoid duty cycle iscontrolled by the PCM in relation to vehicle operating conditionsand regulates actuator feed limit (AFL) fluid into the CC signalcircuit, through the #9-orifice, and to the isolatorvalve. This controls line pressure flow through the regulated applyvalve, into the regulated apply circuit, and provides a smoothengagement of the TCC.

Overdrive Range, Fourth Gear– TCC Applied

Overdrive Range, Fourth Gear - Torque Converter Clutch Applied Automatic Torque Converter Torque Converter Clutch and Lockup

accumulator ex acc accum i-2 accumulator 2nd cl 2nd converter lube mainline sig accumulator actuator feed toruue signal feed lo reverse clutch assemblv input clutch housing assembly oruncl lo/rev cooler; reverse input converter clutch assembly release revwput isolator valve ex tdc solenoid ccsignal pressure control solenoid adc ex lube relav overhun cl ovehrun cl seduence val ervd fd- overrun cl fd] servo ej zndj overrun cl fd overrun cl fd

Gears and Shafts Cleaning and Inspection Manual - part 2     Inadequate oil viscosityUnfavorable gear geometryTemporary lack of lubricantSurface roughnessFaulty heat treatment of the gears Inspect the gears for flank fatigue causing grayspots. Gray spots are localized pittings on the...
End Play Specifications Automatic     End Play Specifications Application Maximum End Play Metric English New Torque Converter 0.800-mm 0.0310-in Used Torque Converter 1.200-mm 0.0472-in Input Carrier and Thrust Washer 1.010-mm...
Intermediate Internal Gear Inspection Automatic     Important:Clutch plate movement can cause notching on the externalsplines of the intermediate internal gear. Inspect the external splines of the intermediate internalgear.Replace the intermediate internal gear if detectable...
Fluid Pump Cover - Torque Converter Housing Side Automatic     Fluid Pump Cover– Torque Converter HousingSide (1) Suction (2) Line (4) Converter Feed (5) Converter Feed Limit (6) TCC Release (7) TCC Apply (8) Cooler Feed (9) Center Lube (10) Regulator...
Control and Shift Solenoids Replacement Automatic Transmission Unit Transmission Shift Solenoids     Removal Procedure ml nu Remove the transmission oil pan and filter. Refer toAutomatic Transmission Fluid and Filter Replacement. Note:Do not remove the valve body for the following procedures.Removal of the 1-2 accumulator...
Automatic Transmission Fluid Filter and Auxiliary Fluid Pump Filter Replacement Automatic Transmission Unit Transmission Oil Pump     Automatic Transmission Fluid Filter and Auxiliary Fluid Pump Filter Replacement Callout Component Name Preliminary Procedure Remove the transmission fluid pan. Refer toTransmission Fluid Pan Replacement. 1...