DTC P0053-00: A/F Sensor Heater Resistance: Notes
DTC P0053:00 DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P0053:00 |
A/F sensor heater resistance |
| DETECTION CONDITION |
- The PCM monitors the A/F sensor heater resistance when under the A/F sensor heater control. If the resistance is more than 30 ohms, the PCM determines that there is a A/F sensor circuit problem.
Diagnostic support note
- This is an intermittent monitor (A/F sensor heater, HO2S heater).
- The check engine light 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 first drive cycle.
- FREEZE FRAME DATA/Snapshot data is available.
- DTC is stored in the PCM memory.
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| FAIL-SAFE FUNCTION |
- Stops fuel feedback control
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| POSSIBLE CAUSE |
- A/F sensor connector or terminals malfunction
- Short to ground or open circuit in A/F sensor heater power supply circuit:
- Short to ground in wiring harness between ENGINE 1 15 A fuse and A/F sensor terminal A
- ENGINE1 15 A fuse malfunction
- Open circuit in wiring harness between main relay terminal C and A/F sensor terminal A
- PCM connector or terminals malfunction
- Short to ground in wiring harness between A/F sensor terminal E and PCM terminal 1BY
- A/F sensor heater malfunction
- Open circuit in wiring harness between A/F sensor terminal E and PCM terminal 1BY
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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