Had Toyota 2000 Echo clutch replaced, now it chatters, especially backing up or at very slow speed when starting out

same

front of engine drivers side

your clutch and throw out bearing needs to be replaced

throw out bearing or worn clutch

sounds like a bad throw out bearing you have to take the tranny out to replace it.

See above chart
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the input turbine. By comparing the input turbine speed signal (NT) and the counter gear speed sensor signal (NC), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure in response to various conditions, thus performing smooth gear shifting.

The first thing that needs to be done when experiencing shaking at certain speeds is have the wheels balanced.

This is a simple procedure that any repair shop should be able to do for a reasonable price.

Try that and check back if the problem continues.

Good luck.

hi check the air filter of the car and try 2 clean ....it can improve the engine power or check the clutch plates of the car  

I have found with various cars that the speed the gas is pumped at makes a huge difference. Try wiggling the input nozzle around so it may be parallel to the ground, and just experiment. Or just slow down your pumping speed. Sometimes more goes in faster than the fuel tank neck can handle.

Whenever you have additional floor mats in the vehicle, the clutch pedal does not go to the floor. This, in turn, prevents the clutch release mechanism from releasing the clutch disc fully from the flywheel. This causes premature clutch disc wear. I would agree that you need a clutch replacement.
The replacement is pretty straight forward, as long as your guy has the ability to support & hold the engine assembly while the transmission is removed.
No big mysteries on the clutch replacement.