DTC P2237-00; Open Circuit Between A/F Sensor Terminal B And Pcm Terminal 1L: Notes

NOTE:

• To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION	Open circuit between A/F sensor terminal B and PCM terminal 1L
DETECTION CONDITION	Determination conditions	After A/F sensor activation, a condition in which PCM terminal 1C voltage is within the specified range continues for 5 s or more.
	Preconditions	Battery voltage: 11-18 V(1) The following DTC is not detected: Internal PCM malfunction: P064D:00
	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	Illuminates check engine light.
POSSIBLE CAUSE	A/F sensor connector or terminals malfunction PCM connector or terminals malfunction Open circuit in wiring harness between A/F sensor terminal B and PCM terminal 1L A/F sensor malfunction PCM malfunction
(1) Value can be verified by displaying PIDs using M-MDS

System Wiring Diagram

Fig 1: A/F Sensor Circuit Diagram

Courtesy of MAZDA MOTORS CORP.