DTC P0131: Notes

DTC P0131 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0131	Front HO2S circuit low input
DETECTION CONDITION	The PCM monitors the input voltage from the front HO2S when the engine is running. If the input voltage is above 1.0 V for 25 s , the PCM determines that the front HO2S circuit voltage is low. Diagnostic support note This is a continuance monitor (HO2S). 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. DTCs are stored in the PCM memory.
POSSIBLE CAUSE	Front HO2S malfunction Connector or terminal malfunction Open circuit in the wiring harness between front HO2S terminal 1C and PCM terminal 2J Short to ground in the wiring harness between front HO2S terminal 1C and PCM terminal 2J Open circuit in the wiring harness between front HO2S terminal 1B and PCM terminal 2G Short to ground in the wiring harness between front HO2S terminal 1B and PCM terminal 2G Short to ground in the wiring harness between front HO2S terminal 1A and PCM terminal 2D PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0131

Front HO2S circuit low input

DETECTION CONDITION

The PCM monitors the input voltage from the front HO2S when the engine is running. If the input voltage is above 1.0 V for 25 s , the PCM determines that the front HO2S circuit voltage is low.

Diagnostic support note

This is a continuance monitor (HO2S).
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.
DTCs are stored in the PCM memory.

POSSIBLE CAUSE

Front HO2S malfunction
Connector or terminal malfunction
Open circuit in the wiring harness between front HO2S terminal 1C and PCM terminal 2J
Short to ground in the wiring harness between front HO2S terminal 1C and PCM terminal 2J
Open circuit in the wiring harness between front HO2S terminal 1B and PCM terminal 2G
Short to ground in the wiring harness between front HO2S terminal 1B and PCM terminal 2G
Short to ground in the wiring harness between front HO2S terminal 1A and PCM terminal 2D
PCM malfunction

Courtesy of MAZDA MOTORS CORP.