FixVault

DTC P2109: TP Sensor Minimum Stop Range/Performance Problem

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DTC P2109 Detection Condition & Possible Causes Chart
G01345420Courtesy of MAZDA MOTORS CORP.

Diagnostic Procedure 

Fig 2: DTC P2109 Diagnostic Procedure Chart
G01345421Courtesy of MAZDA MOTORS CORP.