DTC P0054: Notes

DTC P0054 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P0054	HO2S heater resistance
DETECTION CONDITION	The PCM monitors the HO2S heater resistance when under the HO2S heater control. If the resistance is more than 34 ohms , the PCM determines that there is a HO2S heater circuit problem. Diagnostic support note This is a 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	HO2S connector or terminals malfunction HO2S heater malfunction Short to ground or open circuit in HO2S heater power supply circuit Short to ground in wiring harness between ignition switch terminal A and HO2S terminal C ENG2 15 A fuse malfunction Open circuit in wiring harness between ignition switch terminal A and HO2S terminal C Short to ground between HO2S terminal D and PCM terminal 2B PCM connector or terminals malfunction Open circuit between HO2S terminal D and PCM terminal 2B PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0054

HO2S heater resistance

DETECTION CONDITION

The PCM monitors the HO2S heater resistance when under the HO2S heater control. If the resistance is more than 34 ohms , the PCM determines that there is a HO2S heater circuit problem.

Diagnostic support note

This is a 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

HO2S connector or terminals malfunction
HO2S heater malfunction
Short to ground or open circuit in HO2S heater power supply circuit
- Short to ground in wiring harness between ignition switch terminal A and HO2S terminal C
- ENG2 15 A fuse malfunction
- Open circuit in wiring harness between ignition switch terminal A and HO2S terminal C
Short to ground between HO2S terminal D and PCM terminal 2B
PCM connector or terminals malfunction
Open circuit between HO2S terminal D and PCM terminal 2B
PCM malfunction

Courtesy of MAZDA MOTORS CORP.