DTC P2243:00 [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 P2243:00	A/F sensor reference voltage circuit open
DETECTION CONDITION	The PCM monitors the A/F sensor signal voltage at PCM terminal 2Z If the either of the following condition is met, the PCM determines that the A/F sensor reference voltage circuit is open. The PCM terminal 2Z voltage is specified voltage or more for 5 s The PCM detects DTC P003000 or P0134 00 while the pending code P2243 00 is stored. MONITORING CONDITIONS A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode Following conditions are met Engine is running or ignition switch is ON Battery voltage. 10-18 V A/F sensor element impedance below 220 ohm Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycle or in one drive cycle while the DTC for the same malfunction has been stored in the PCM PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle FREEZE FRAME DATA is available. The DTC is stored in 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 F and PCM terminal 2Z PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P2243:00

A/F sensor reference voltage circuit open

DETECTION CONDITION

The PCM monitors the A/F sensor signal voltage at PCM terminal 2Z If the either of the following condition is met, the PCM determines that the A/F sensor reference voltage circuit is open.
- The PCM terminal 2Z voltage is specified voltage or more for 5 s
- The PCM detects DTC P003000 or P0134 00 while the pending code P2243 00 is stored.

MONITORING CONDITIONS

A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode
Following conditions are met
- Engine is running or ignition switch is ON
- Battery voltage. 10-18 V
- A/F sensor element impedance below 220 ohm

Diagnostic support note

This is a continuous monitor (A/F sensor, HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycle or in one drive cycle while the DTC for the same malfunction has been stored in the PCM
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle
FREEZE FRAME DATA is available.
The DTC is stored in 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 F and PCM terminal 2Z
PCM malfunction

Courtesy of MAZDA MOTORS CORP.