DTC P0134: Heated Oxygen Sensor Circuit No Activity Detected (bank 1, sensor 1)

Heated Oxygen Sensor Circuit No Activity Detected (bank 1, sensor 1) Circuit
Refer to, DTC P0130 - Heated Oxygen Sensor Circuit (bank 1, sensor 1) .
Refer to, DTC P0201, P0202, P0203, P0204, P0205, P0206 - Injector Circuit .
CIRCUIT OPERATION
Refer to, DTC P0130-Heated Oxygen Sensor Circuit (bank 1, sensor 1) .
Refer to, DTC P0201, P0202, P0203, P0204, P0205, P0206-Injector Circuit .
TECHNICAL DESCRIPTION
• The PCM effects air/fuel ratio feedback control in accordance with the signals from the right bank heater oxygen sensor (front).
• If the right bank heated oxygen sensor (front) has deteriorated, corrections will be made by the right bank heated oxygen sensor (rear).
• DTC P0134 is stored when abnormality of the air/fuel ratio feedback control is detected.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output voltage does not cross 0.5 volt within specified period.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Misfire monitor

Sensor (The sensor below is determined to be normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
DTC SET CONDITIONS Logic Flow Chart


Check Conditions
20 seconds or more have passed since the starting sequence was completed.
Engine coolant temperature is higher than 76°C (169°F).
Engine speed is higher than 1,200 r/min.
Volumetric efficiency is higher than 30 percent and lower than 95 percent.
Throttle position sensor output voltage is lower than 4 volts.
Except while fuel is being shut off.
Monitoring time: 30 seconds.

Judgment Criteria
• Right bank heated oxygen sensor (front) output voltage does not get across 0.5 volt within about 30 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:
• Right bank heated oxygen sensor (front) deteriorated.
• Harness damage in right bank heated oxygen sensor (front) output line.
• Right bank heated oxygen sensor (rear) deteriorated.
NOTE: When the right bank heated oxygen sensor (front) begins to deteriorate, the heated oxygen sensor output voltage will deviate from the voltage when the sensor was new (normally 0.5 volt at stoichiometric ratio). This deviation will be corrected by the right bank heated oxygen sensor (rear). If the right bank heated oxygen sensor (rear) responds poorly because it has deteriorated, it will improperly correct the right bank heated oxygen sensor (front). Thus, even when closed loop control is being effected, the fluctuation of the right bank heated oxygen sensor (front) output voltage decreases, without intersecting with 0.5 volt. As a result, there is a possibility of DTC P0134 becoming registered.
• Connector damage.
• Harness damage in injector circuit.
• Injector failed.
• PCM failed.
• Exhaust leaks.
• Incurrect fuel pressure.
• Intake system vacuum leak.