Page 23 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

TORQUE CONVERTER

TCC RELEASE TCC APPLY
When the torque converter clutch is released, fluid is When the TCM determines that the vehicle is at the
fed into the torque converter by the pump into the proper speed for the torque converter clutch to apply,
release fluid passage. The release fluid passage is it sends a signal to the TCC pressure control (PC)
located between the stator shaft and the turbine shaft solenoid valve. The TCC PC solenoid valve then
(56). Fluid travels between the shafts and enters the regulates line fluid from the pump into the regulated
release side of the pressure plate at the end of the apply passage. The regulated apply fluid then feeds
turbine shaft. The pressure plate is forced away from the apply fluid passage and applies the torque
the converter cover and allows the torque converter converter. The apply passage is located between the
turbine to rotate at speeds other than engine speed. converter hub and the stator shaft. The fluid flows
between the shafts, then passes into the torque
The release fluid then flows between the friction converter on the apply side of the pressure plate
element on the pressure plate and the converter cover assembly. Release fluid is then routed out of the
to enter the apply side of the torque converter. The torque converter between the turbine shaft and the
fluid then exits the torque converter through the apply stator shaft.
passage, which is located between the torque
converter clutch hub and the stator shaft, and enters Apply fluid pressure forces the pressure plate against
the pump. the torque converter cover to provide a mechanical
link between the engine and the turbine.
No TCC apply can be caused by:
The TCC may apply in 1st (without engine braking)
• Electrical connectors, wiring harness or solenoid damaged
• Torque converter internal damage 2nd, 3rd, 4th, 5th and 6th gear (depending on the
• TCC control valve and spring worn, damaged or sticking shift conditions), but should not apply until the
• Turbine shaft O-ring seal cut or damaged transmission fluid and engine coolant temperatures
• TCC regulator apply valve worn, damaged or sticking have reached a minimum value (calibrated in TCM).

➤
➤
4-5-6 4-5-6
RELEASE CLUTCH APPLY CLUTCH
FLUID FLUID
ASSEMBLY ASSEMBLY
➤ (56) (56)
➤
(TURBINE (TURBINE
SHAFT) SHAFT)
APPLY
FLUID RELEASE
FLUID

➤
➤
➤
➤
RELEASE
FLUID APPLY
FLUID

TORQUE TORQUE
CONVERTER CONVERTER
ASSEMBLY ASSEMBLY
➤ ➤ (1)
➤
➤
PRESSURE (1) PRESSURE
PLATE PLATE
TCC RELEASE TCC APPLY

14 Figure 15