Possible Causes

WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

Following items are possible causes for DTC P1705:

TR switch malfunction or misadjusted.
Open or short to ground or power in circuits between PCM and TR switch.
Damaged connectors or wiring harness between TR switch and PCM.
PCM malfunction.