96 mazda has a code P0740

DTC P0740 Torque Converter Clutch (TCC) Enable Solenoid Control Circuit

Circuit Description
The torque converter clutch (TCC) solenoid valve is an electrical device that is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve in order to control TCC apply and release. The TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. The TCC solenoid valve receives ignition voltage through the ignition 0 voltage circuit. The powertrain control module (PCM) controls the solenoid by providing the ground path on the TCC solenoid valve control circuit. The PCM monitors the throttle position sensor voltage, the vehicle speed, and other inputs in order to determine when to energize the TCC solenoid valve.
When the PCM detects a continuous open, short to ground or short to power in the TCC solenoid valve circuit, then DTC P0740 sets. DTC P0740 is a type B DTC.

Check it out on youtube.

https://www.youtube.com/watch?v=XzniUfjK6Aw https://www.transmissionrepaircostguide.com/p0740

On some cars, there is a TCC solenoid in the transmission which can be replaced by removing the bottom pan. In some cars this solenoid can't be accessed without major disassembly.

code p0740 refers to torque converter clutch(TCC) solenoid---circuit malfunction====causes wiring--TCC solenoid---ECM/TCM
When this unit becomes a problem it will indicate as no gear engagement
I would suggest that the problem be investigated before it holds you up at the wrong time.

This indicates a faulty Transmission Torque Converter Clutch (TCC) circuit (0740) or TCC solenoid (0743)

Error Code: P0740
Description:
Torque Converter Clutch (TCC) Solenoid - Circuit Malfunction
Possible Cause:
Wiring.
Torque converter clutch (TCC) solenoid.
Engine control module (ECM)/Powertrain control module (PCM)/Transmission control module (TCM).

Trouble Code: P0740

A/T TCC Solenoid Circuit Malfunction

Possible Causes:


TCC solenoid control circuit open or shorted to groundTCC solenoid control circuit shorted to system power (B+)TCC solenoid is damaged or has failedPCM has failed

P0740=Torque Converter Clutch Circuit/Open,
not a solenoid,or tps

Here are the DTC's for the TCC Solenoid:

DTC P0740 TCC Enable Solenoid Circuit Electrical
DTC P0741 TCC System Stuck Off
DTC P0742 TCC System Stuck On
DTC P0743 TCC Enable Solenoid Circuit Electrical
DTC P0744 Torque Converter Clutch Circuit Intermittent

-KC GTO Dad

I sounds like the TCC solenoid has failed. The stalling problem confirms that the TCC is engaged.