Oil control valve. This might help even though its not an echo, its very similar:
http://www.newcelica.org/forums/showthread.php?t=249837
Trouble code P1656 means: OCV Circuit Malfunction
The oil control valve (OCV) on a 2000 Toyota Echo regulates the flow of oil to the variable valve timing (VVT) system, which optimizes engine performance and efficiency. It adjusts the timing of the intake and exhaust valves based on engine speed and load, improving power delivery and fuel economy. If the OCV malfunctions, it can lead to poor engine performance, decreased fuel efficiency, and increased emissions. Regular maintenance and timely replacement of a faulty OCV are essential for maintaining optimal engine operation.
yes
hi i have smal question,how to change thermostat in Toyota echo 2000 thanks
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
Yes.
search for echo manual torrent
The oil control valves (OCV) are located between the cylinders on the drivers side. Bank 1 OCV is below the throttle body. Bank 2 is above the starter.
Pretty sure its the same as the 2000 Toyota echo, see related link.
If the A/C is not working on a 2000 Toyota Echo, the pump may need to be recharged. It is also possible that the belt for this is broken or the thermostat is sticking.
Mine is a Toyota echo 2000 sedan. It does about 12 to 15 KMPL per 1 petrol litre.
there are no 2000 yaris that would be an echo