DTC P2237:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSES

DTC P2237:00	A/F sensor positive current control circuit open
DETECTION CONDITION	The PCM monitors A/F sensor positive current control circuit voltage. If the voltage out of the specified value while the engine running, the PCM determines that the A/F sensor positive current control circuit is open. Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The MIL illuminates if PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if PCM detects the above malfunction conditions during first drive cycle. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	A/F sensor connector or terminal malfunction PCM connector or terminal malfunction A/F sensor malfunction Open circuit in wiring harness between A/F sensor terminal B and PCM terminal 2AD PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P2237:00

A/F sensor positive current control circuit open

DETECTION CONDITION

The PCM monitors A/F sensor positive current control circuit voltage. If the voltage out of the specified value while the engine running, the PCM determines that the A/F sensor positive current control circuit is open.

Diagnostic support note

This is a continuous monitor (A/F sensor, HO2S).
The MIL illuminates if PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if PCM detects the above malfunction conditions during first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

A/F sensor connector or terminal malfunction
PCM connector or terminal malfunction
A/F sensor malfunction
Open circuit in wiring harness between A/F sensor terminal B and PCM terminal 2AD
PCM malfunction

Courtesy of MAZDA MOTORS CORP.