With Coolant Control Valve

DTC P2109:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P2109:00	TP sensor minimum stop range/performance problem
DETECTION CONDITION	If the fully-close throttle position is 5.1° or lower, or 15.9° or more (even though fully-closed throttle position learning is finished), the PCM determines there is a malfunction. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Restricts the upper limit of the engine speed. Stops the drive-by-wire control (throttle valve is open at approx. 8° by return spring force).
POSSIBLE CAUSE	Throttle body connector or terminals malfunction Short to ground in wiring harness between the following terminals: Throttle body terminal E-PCM terminal 1CQ Throttle body terminal F-PCM terminal 1CR PCM connector or terminals malfunction Short to power supply in wiring harness between the following terminals: Throttle body terminal E-PCM terminal 1CQ Throttle body terminal F-PCM terminal 1CR Open circuit in wiring harness between the following terminals: Throttle body terminal E-PCM terminal 1CQ Throttle body terminal F-PCM terminal 1CR Throttle valve malfunction Throttle valve actuator malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.