DTC P2243: Notes
DTC P2243 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES
| DTC P2243 |
A/F sensor reference voltage circuit open |
| DETECTION CONDITION |
- The PCM monitors the A/F sensor signal voltage. 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 5s
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- PCM detects DTC P0134 or P0030 while the pending code P2243 is stored.
MONITORING CONDITIONS
- HO2S heater, HO2S, and TWC verification drive mode
- Following conditions are met
- Engine is running or ignition switch is ON position
- Battery voltage is 11-18 V
- A/F sensor element impedance below 220 ohms
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 (Mode 2/Mode 12) is available.
- DTC is stored in PCM memory.
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| POSSIBLE CAUSE |
- A/F sensor connector or terminal malfunction
- PCM connector or terminal malfunction
- Short to power supply circuit between A/F sensor terminal F and PCM terminal 2Z
- Open circuit between A/F sensor terminal F and PCM terminal 2Z
- A/F sensor malfunction
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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