Torque Converter Clutch
See MISCELLANEOUS CONTROLS .
Torque Converter Clutch Solenoid (Non-Electronic Transaxle)
The purpose of the transaxle Torque Converter Clutch (TCC) solenoid feature is to eliminate power loss of torque converter stage when vehicle is in a cruise condition. This allows convenience of automatic transaxle and fuel economy of a manual transmission.
Fused battery ignition is supplied to TCC solenoid through a brake switch. For wiring reference, see WIRING DIAGRAMS article.
Converter clutch will engage when, engine is at normal operating temperature, throttle position sensor output is not changing (indicating a steady vehicle speed), transmission 3rd gear clutch pressure switch and brake switch are closed.
When vehicle speed is great enough (as indicated by the vehicle speed sensor), PCM energizes the TCC solenoid mounted in the transmission. This allows torque converter to directly connect engine to the transmission. When operating conditions indicate transmission should operate as normal, TCC solenoid is de-energized.
This allows transmission to return to normal automatic operation. Since power for the TCC solenoid is delivered through the brake switch, transmission will also return to normal automatic operation when brake pedal is depressed. To check TCC system, perform functional check of TCC system. See MISCELLANEOUS CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
Torque Converter Clutch (Electronic Transaxle/Transmission)
The torque converter clutch functions similarly to the non-electronic type. A TCC Pulse Width Modulated (PWM) solenoid valve is used that regulates hydraulic pressure to make locking and unlocking of the TCC smoother.