DTC P0031 [L3]: Notes
DTC P0031 (L3) DETECTION CONDITION & POSSIBLE CAUSES
| DTC P0031 |
A/F sensor heater circuit low input |
| DETECTION CONDITION |
- The PCM monitors the A/F sensor heater output voltage at PCM terminal 2A. If the PCM turns the A/F sensor heater to OFF but the A/F sensor heater circuit voltage is below 5 V
for 2 s
, the PCM determines that the A/F sensor heater circuit has malfunction.
NOTE:
- The A/F sensor heater is controlled by duty signal.
Diagnostic support note
- This is a continuous monitor (A/F sensor heater).
- MIL illuminates if the PCM detects the above malfunction 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 the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA is available.
- The DTC is stored in-the PCM memory.
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| POSSIBLE CAUSE |
- A/F sensor connector or terminal malfunction.
- A/F sensor malfunction
- Open circuit in wiring harness between main relay and A/F sensor terminal A
- PCM connector or terminal malfunction
- Short to ground in wiring harness between A/F sensor terminal E and PCM terminal 2A
- Open circuit in wiring harness between A/F sensor terminal E and PCM terminal 2A
- PCM malfunction
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