TECHNICAL DESCRIPTION
- The ECM effects air/fuel ratio feedback control in accordance with the signals from the linear air-fuel ratio sensor.
- If the linear air-fuel ratio sensor has deteriorated, corrections will be made by the heated oxygen sensor (rear).
DESCRIPTIONS OF MONITOR METHODS
- When the average of the response times of the rich side of the linear air-fuel ratio sensor during the monitoring time becomes equal to or higher than the predetermined value, the DTC is set as the linear air-fuel ratio sensor deterioration.
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
- Linear air-fuel ratio sensor heater monitor
- Misfire monitor
- Fuel system monitor
Sensor (The sensor below is determined to be normal)
- Mass airflow sensor
- Engine coolant temperature sensor
- Intake air temperature sensor
- Barometric pressure sensor
- Throttle position sensor
- Accelerator pedal position sensor
Check Conditions
- Engine speed is between 1,219 and 3,000 r/min.
- Volumetric efficiency is between 27.5 and 85.0 percent.
- Mass airflow sensor output is 9 g/sec or more.
- Engine coolant temperature is more than 60°C (140°F).
- Under the closed loop air/fuel control.
- The accelerator pedal is depressed.
- Short-term fuel trim is between -25 and +25 percent.
- More than 3 seconds have passed after the above mentioned conditions have been met.
- Linear air-fuel ratio sensor signal length is 3.51 or less. <Except vehicles for Mexico>
- Linear air-fuel ratio sensor signal length is 2.70 or less. <Vehicles for Mexico>
- The malfunction of DTC P014C and P014D are not detected.
- During the drive cycle, the ECM performs monitoring with the accumulated total time of 10 seconds, 3 times.
Judgment Criteria
- The average response time of to rich response is more than specified time.
- The amount of compensated air/fuel ratio based on the heated oxygen sensor (rear) is out of specified amount.
FAIL-SAFE AND BACKUP FUNCTION
OBD-II DRIVE CYCLE PATTERN
- Refer to Diagnosis Function - OBD-II Drive Cycle - Pattern 1 .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Linear air-fuel ratio sensor failed.