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I THINK the mainshaft (input) speed sensor is #15 in this diagram, at the front: AT SENSOR - SOLENOID (5AT) for 2004 Honda ODYSSEY

Part #15 on top of the transmission is the countershaft (output) speed sensor.

Don't want to rain on your parade, but P0715 could also mean that an internal transmission problem is causing an incorrect ratio between the input and output shafts i.e. the speed sensors are sending the right speed data but the calculated speed ratio is wrong.

Dave
 
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