Hello,
Really, Toyota Manufacturer's DTC p1410 is set when "EGR Valve Position Sensor Circuit Malfunction" (The EGR valve position sensor is mounted on the EGR valve and detects the lift amount of EGR valve. The lift amount of EGR valve which is detected by the EGR valve position sensor provides feedback to the ECM to
control the lift amount of EGR valve in response to engine operating conditions)
and p1411 - "EGR Valve Position Sensor Circuit Range-Performance".
Need check poor connector, voltage, resistance, etc.
Let me know if need description for Diagnostic.
Photo of this "device" on 1MZ-FE 3.0 L Engine is located on
http://www.alflash.narod.ru/1mz/EGR1.jpg
HTH,