With Coolant Control Valve

DTC P0122:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0122:00	TP sensor No. 1 circuit low input
DETECTION CONDITION	If the PCM detects that the TP sensor No. 1 voltage at the PCM terminal 1O is below 0.13 V, the PCM determines that the TP sensor No. 1 circuit has 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.
POSSIBLE CAUSE	Throttle body connector or terminals malfunction PCM connector or terminals malfunction Short to ground in wiring harness between the following terminals: Throttle body terminal B-PCM terminal 1L Throttle body terminal A-PCM terminal 1O TP sensor No. 1 signal circuit and ground circuit are shorted to each other TP sensor No. 1 malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.