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DTC P0030 [LF]: Notes

DTC P0030 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0030 A/F sensor heater control circuit problem
DETECTION CONDITION 
  • The PCM monitors the A/F sensor impedance when under the A/F sensor heater control for 200 s  . If the impedance is more than 44 ohms  , the PCM determines that there is a A/F sensor heater control circuit problem.

Diagnostic support note 
  • This is an intermittent monitor (A/F sensor heater, 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 (Mode 2/Mode 12) is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • A/F sensor connector or terminals malfunction
  • A/F sensor heater malfunction
  • PCM connector or terminals malfunction
  • PCM malfunction
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