DTC P0053: Notes

DTC P0053 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P0053	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 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	A/F sensor connector or terminals malfunction A/F sensor heater malfunction Short to ground or open circuit in A/F sensor heater power supply circuit Short to ground in wiring harness between main relay terminal C and A/F sensor terminal A ENG BAR2 15 A fuse malfunction Open circuit in wiring harness between main relay terminal C and A/F sensor terminal A Short to ground between A/F sensor terminal E and PCM terminal 2A PCM connector or terminals malfunction Open circuit between A/F sensor terminal E and PCM terminal 2A PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0053

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 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

A/F sensor connector or terminals malfunction
A/F sensor heater malfunction
Short to ground or open circuit in A/F sensor heater power supply circuit
- Short to ground in wiring harness between main relay terminal C and A/F sensor terminal A
- ENG BAR2 15 A fuse malfunction
- Open circuit in wiring harness between main relay terminal C and A/F sensor terminal A
Short to ground between A/F sensor terminal E and PCM terminal 2A
PCM connector or terminals malfunction
Open circuit between A/F sensor terminal E and PCM terminal 2A
PCM malfunction

Courtesy of MAZDA MOTORS CORP.