Ok, here is info on the TCC (Torque Converter Clutch) Solenoid. Have you checked to see if there is an AAMCO in your area, they do transmission work.
The Torque Converter Clutch (TCC) assembly consists of a 3-element torque converter with the addition of a converter clutch. The converter clutch is an internal mechanism with friction material attached to front face. It is splined to the turbine assembly in converter.
The purpose of the torque converter clutch feature is to eliminate power loss due to slippage when vehicle is cruising. This allows the convenience of an automatic transmission and the fuel economy of a manual transmission.
When the TCC solenoid ground circuit is completed by the Electronic Control Module (ECM), the torque converter clutch is applied, resulting in a direct mechanical coupling between engine and transmission. When TCC solenoid is deactivated, the torque converter clutch is released, allowing torque converter to operate in a conventional manner.
TCC CONTROL COMPONENTS
The following components are used in TCC system. Not all components will be present on all vehicles.
Power from ignition switch passes through brake switch to TCC solenoid. When brake pedal is depressed with TCC engaged, power to TCC solenoid is interrupted, releasing converter clutch and preventing engine from stalling.
Fig 1: Torque Converter Assembly with TCC G92A13680 Courtesy of GENERAL MOTORS CORP.
Coolant Temperature Sensor
This sensor provides ECM with engine coolant temperature information. ECM will not allow TCC operation until signal from this sensor indicates coolant temperature greater than 130-150 F (55-65 C).
Electronic Control Module (ECM)
To determine application of torque converter clutch, ECM receives and processes information from various input devices. These devices may include the vehicle speed sensor, coolant temperature sensor, throttle position sensor, 3rd and 4th gear switches and brake switch. The ECM controls application of torque converter clutch by providing a ground circuit for the TCC solenoid circuit.
TCC Solenoid Assembly
Solenoid is energized by ECM to redirect transmission fluid to the converter clutch apply valve in the auxiliary control valve assembly.
Throttle Position Sensor (TPS)
Provides ECM with throttle position information. TCC operation is prevented when throttle position signal is less than a specified value.
Sends engine vacuum (load) information to ECM.
Vehicle Speed Sensor (VSS)
This sensor sends vehicle speed information to ECM. Vehicle speed must be greater than a certain value before TCC can be applied. Two types of speed sensor are used. A light emitting diode type is used in the instrument cluster on some models. Other models use a Permanent Magnet (PM) generator mounted in the transmission.
3rd & 4th Gear Switches
When open, 3rd and 4th gear switches prevent TCC operation. Switch status may be monitored by ECM, or switch may be an integral portion (series circuit) of TCC solenoid power supply.
Sunday, March 23rd, 2014 AT 6:38 AM