Except California Emission Regulation Applicable ATX Model: Notes
DTC P0030 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0030 |
Front HO2S heater control circuit problem |
| DETECTION CONDITION |
- OBD system monitors the output signal voltage from oxygen sensor which is proportion to the element impedance of oxygen sensor.
- If the output signal voltage isn't between 0.75 V
and 1.5 V
after specified time from engine start, heater performance considered failed.
MONITORING CONDITIONS
- Battery voltage: 10-18 V
- Time from engine start is 74 s or more
Diagnostic support note
- This is an intermittent monitor (HO2S heater).
- The 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 |
- Front HO2S heater malfunction
- Connector or terminal malfunction
- Short to ground in wiring harness between front HO2S terminal C, 2D and PCM terminal 2BG
- Short to power supply in wiring harness between front HO2S terminal C, 2D and PCM terminal 2BG
- Open circuit in wiring harness between front HO2S terminal 1B and PCM terminal 2AC
- Open circuit in wiring harness between front HO2S terminal C, 2D and PCM terminal 2BG
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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