DTC P0134-00: A/F Sensor Circuit No Activity Detected: Notes

DTC P0134:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0134:00	A/F sensor circuit no activity detected
DETECTION CONDITION	The PCM monitors the element impedance A/F sensor when the following conditions are met. Under the following monitoring conditions, the element impedance more than specified value, the PCM determines that the A/F sensor is not activated. MONITORING CONDITIONS Drive Mode 03 (EGR System, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S and TWC Repair Verification Drive Mode) The following conditions are met: A/F sensor heater is turned on for above 35 s. Battery voltage: 11-18 V Diagnostic support note This is an intermittent monitor (A/F sensor, HO2S). 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 (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
POSSIBLE CAUSE	A/F sensor loose Exhaust system leakage A/F sensor connector or terminals malfunction A/F sensor heater malfunction Short to ground in wiring harness between the following terminals: A/F sensor terminal 1C- PCM terminal 2Z A/F sensor terminal 1B-PCM terminal 2AC A/F sensor terminal 1A-PCM terminal 2AD A/F sensor terminal 2D-PCM terminal 2A PCM connector or terminals malfunction Open circuit in wiring harness between the following terminals: A/F sensor terminal 1C-PCM terminal 2Z A/F sensor terminal 1B-PCM terminal 2AC A/F sensor terminal 1A-PCM terminal 2AD A/F sensor terminal 2D-PCM terminal 2A Engine malfunction Insufficient engine compression Engine coolant leakage to combustion chamber A/F sensor malfunction A/F sensor deterioration PCM malfunction
Courtesy of MAZDA MOTORS CORP.