P015A

2AR-FE ENGINE CONTROL: SFI SYSTEM: P015A A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1

DESCRIPTION

HINT
- Refer to DTC P2195 P2195.
- Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.





*: Calculated by the ECM based on the air fuel ratio sensor output

MONITOR DESCRIPTION

After the engine is warm, the ECM carries out air-fuel ratio feedback control, and maintains the air-fuel ratio at the stoichiometric level. In addition, after all the preconditions have been met, active air-fuel ratio control is carried out for approx. 10 seconds, and during active air-fuel ratio control, the ECM measures the response of the air fuel ratio sensor by increasing or decreasing the injection volume by a specific quantity based on the stoichiometric air-fuel ratio learned during normal air-fuel control. The ECM determines whether there is an air fuel ratio sensor malfunction at the mid-point of active air-fuel ratio control.

If the air fuel ratio sensor's response ability is reduced, DTC P014C and P014D are stored.

If the time it takes the air fuel ratio sensor output to change is delayed, DTC P015A and P015B are stored.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

Air Fuel Ratio Sensor Slow Response (Rich to Lean)





Air Fuel Ratio Sensor Slow Response (Lean to Rich)





Air Fuel Ratio Sensor Delayed Response (Rich to Lean)





Air Fuel Ratio Sensor Delayed Response (Lean to Rich)





MONITOR RESULT

Refer to detailed information in Checking Monitor Status Mode 6 Data.

P014C: O2 Sensor / RL RES RATE B1S1





P014D: O2 Sensor / LR RES RATE B1S1





P015A: O2 Sensor / RL DELAY B1S1





P015B: O2 Sensor / LR DELAY B1S1





CONFIRMATION DRIVING PATTERN

HINT
Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.





1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON.

3. Turn the Techstream on.

4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

5. Turn the ignition switch off and wait for at least 30 seconds.

6. Turn the ignition switch to ON and turn the Techstream on.

7. Enter the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / Details.

8. Check that RES RATE B1S1 is Incomplete.

9. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

10. Drive the vehicle at approximately 60 km/h (38 mph) for 10 minutes or more in a city area [B].

CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

11. Check the monitor result values on the Techstream by entering the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / Details / RES RATE B1S1.

12. If the values indicated on the Techstream do not change, perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor Monitors, Trips, Drive Cycles and Readiness Codes.

13. Note the value of Monitor Result.

14. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

15. Read the pending DTCs.

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.

16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

17. Input the DTC: P014C, P014D, P015A or P015B.

18. Check the DTC judgment result.





HINT
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform the following procedure.

19. Drive the vehicle at a speed between 75 and 100 km/h (47 and 63 mph) for 10 minutes [D].

CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

20. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

21. Read the pending DTCs.

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.

22. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

23. Input the DTC: P014C, P014D, P015A or P015B.

24. Check the DTC judgment result.





HINT
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.

25. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P2195 P2195.

INSPECTION PROCEDURE

HINT
- A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
- A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
- Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
- Sensor 1 refers to the sensor mounted in front of the Three-way Catalytic Converter (TWC) and located near the engine assembly.
- Sensor 1 refers to the sensor closest to the engine assembly.
- Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

1. CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P015A OR P015B)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Result





HINT
If any DTCs other than P014C, P014D, P015A or P015B are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART Engine Control - SFI System
A -- Continue to next step.

2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

(a) Inspect the air fuel ratio sensor Air Fuel Ratio Sensor.

NG -- REPLACE AIR FUEL RATIO SENSOR Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Bank 1





Standard Resistance (Check for Short):

Bank 1





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK AIR FUEL RATIO SENSOR

(a) Check that the proper air fuel ratio sensor is installed to the vehicle.

NG -- REPLACE AIR FUEL RATIO SENSOR Removal
OK -- Continue to next step.

5. PERFORM CONFIRMATION DRIVING PATTERN

(a) Drive the vehicle according to Confirmation Driving Pattern.

NEXT -- Continue to next step.

6. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(e) Read the DTCs.

Result





B -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
A -- Continue to next step.

7. REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor Removal.

NEXT -- Continue to next step.

8. PERFORM CONFIRMATION DRIVING PATTERN

(a) Drive the vehicle according to Confirmation Driving Pattern.

NEXT -- Continue to next step.

9. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(e) Read the DTCs.

Result





B -- CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO P0171

A -- END