How is the torque converter clutch solenoid controlled?
The fluid pressure that applies and releases the torque converter lockup clutch is controlled by the torque converter clutch solenoid. The opening and closing of the TCC solenoid valve is controlled by the transmission control module (TCM) or powertrain control module (PCM), depending on the vehicle.
What’s the diagnostic code for a torque converter clutch?
These situations normally end with complete transmission failure. A faulty torque converter clutch solenoid normally sets a Diagnostic Trouble Code (DTC), which causes the Check Engine Light to come on. A faulty torque converter clutch solenoid will normally set diagnostic trouble code P0740.
Where is the lockup clutch in a transmission converter?
To prevent slipping at certain speeds (normally speeds exceeding 37 mph) a lockup clutch located inside the converter locks the engine’s output drive to the transmission’s input shaft to achieve a 1:1 ratio – meaning 100% of the engine’s power is now reaching the transmission.
What is the code for torque converter clutch solenoid?
Code P0740 indicates that the control module detects an electrical problem with the torque converter clutch solenoid or the solenoid’s circuit. Note: Although code P0740 is a generic code specified by the Society of Automotive Engineers (SAE), the code’s definition may vary depending on the vehicle manufacturer.
How does the torque converter lock up the clutch?
The pressure required to accomplish converter lock-up derives from the transmission’s integral pressure pump that is driven by the engine via the torque converter. Based on inputs from the PCM, some of the pressure is directed through either solenoids or valve shuttles in the valve body to activate the actual torque converter lock-up mechanism.
What does stuck off mean on a torque converter?
The words “Stuck Off” in a definition of this code refers to the fact that the torque converter clutch control solenoid is stuck in the “OFF” position, and can therefore not engage the torque converter clutch or lock-up mechanism.
What is the purpose of the p0741 torque converter clutch?
Although the actual parameters that set code P0741 vary greatly between applications, the basic operating principles and purpose of the torque converter clutch remain the same in all cases, which is to provide a solid link between the engine and the transmission, much like a conventional clutch locks a manual transmission to the engine.
