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

DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0134:00	A/F sensor circuit no activity detected
DETECTION CONDITION	The PCM monitors the element impedance of the A/F sensor when the following conditions are met. Under the following monitoring conditions, if the element impedance is more than specified value, the PCM determines that the A/F sensor is not activated. MONITORING CONDITIONS Drive Mode 03 (Variable Valve Timing, 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	Erratic signal from A/F sensor 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 F-PCM terminal 1W A/F sensor terminal D-PCM terminal 1AB A/F sensor terminal B-PCM terminal 1AG A/F sensor terminal E-PCM terminal 1BY PCM connector or terminals malfunction Open circuit in wiring harness between the following terminals: A/F sensor terminal F-PCM terminal 1W A/F sensor terminal D-PCM terminal 1AB A/F sensor terminal B-PCM terminal 1AG A/F sensor terminal E-PCM terminal 1BY A/F sensor malfunction A/F sensor deterioration Engine malfunction Insufficient engine compression Engine coolant leakage to combustion chamber PCM malfunction

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

RELATED PIDS

Monitor item (Definition)	Unit/Condition	Condition/Specification (Reference)
VSS	KPH, MPH	Displays the vehicle speed
RPM	RPM	Displays the engine speed
O2S11	A	Idle (after warm up): approx. -39 μA Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): approx. 3.84 mA