Details On DTCs

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC P2237:00 (PCM, SKYACTIV-G, US) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Open circuit between A/F sensor terminal B and PCM terminal 1M
Detection condition	Determination conditions	After A/F sensor activation, a condition in which PCM terminal 1S voltage is within the specified range continues for 5 s or more.
	Preconditions	Battery voltage: 11-18 V¹ The following DTC is not detected: Internal PCM malfunction: P064D:00 ^1 : Standard can be verified by displaying PIDs using M-MDS
	Drive cycle	2
	Self test type	CMDTC self test, KOER self test
	Sensor used	A/F sensor
Fail-safe function	Fixes duty value of A/F sensor heater Stops fuel feedback control of A/F sensor
Vehicle status when DTCs are output	Not applicable
Possible cause	A/F sensor connector or terminals malfunction PCM connector or terminals malfunction Open circuit in A/F sensor control circuit A/F sensor malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.