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Home >> Mazda >> 2022 >> CX-5 Turbo Signature >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (On-Board Diagnostic - Engine Control System (VIN M) (1 Of 7)) >> DTC P0054-00: Ho2S Heater Resistance >> Notes

DTC P0054-00: Ho2S Heater Resistance: Notes

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DTC P0054-00: (PCM, VIN M) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0054-00: HO2S heater resistance
DETECTION CONDITION
  • When the PCM controls the HO2S heater, the HO2S element resistance input to the PCM is the specified value or more. 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.
FAIL-SAFE FUNCTION
  • Stops fuel feedback control of HO2S
POSSIBLE CAUSE
  • HO2S connector or terminals malfunction
  • Short to ground or open circuit in HO2S heater power supply circuit
    • Short to ground in wiring harness between ENGINE2 15 A fuse and HO2S terminal C
    • ENGINE2 15 A fuse malfunction
      • Open circuit in wiring harness between sub relay terminal C and HO2S terminal C
  • HO2S heater malfunction
  • PCM connector or terminals malfunction
  • Open circuit in wiring harness between HO2S terminal D and PCM terminal 2BJ
  • Short to ground in wiring harness between HO2S terminal D and PCM terminal 2BJ
  • PCM malfunction
G14464044Courtesy of MAZDA MOTORS CORP.
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