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Home >> Lexus >> 2011 >> IS 250 RWD V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P015A

P015A





4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F, P015A-P015D: A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1
P015D - A/F Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1

DESCRIPTION

HINT
- Refer to DTC P2195 P2195.
- Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.





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

MONITOR DESCRIPTION

After the engine is warmed up, the ECM carries out air-fuel ratio feedback control, and maintains the air-fuel ratio at the theoretical 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 a specific injection quantity based on the theoretical 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, DTCs P014C, P014D, P014E and P014F are output.

If the time it takes the air fuel ratio sensor output to change is delayed, DTCs P015A, P015B, P015C and P015D are output.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

Air Fuel Ratio Sensor (Bank 1, 2) Slow Response (Rich to Lean)





Air Fuel Ratio Sensor (Bank 1, 2) Slow Response (Lean to Rich)





Air Fuel Ratio Sensor (Bank 1, 2) Delayed Response (Rich to Lean)





Air Fuel Ratio Sensor (Bank 1, 2) Delayed Response (Lean to Rich)





MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

CONFIRMATION DRIVING PATTERN

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





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG).

3. Turn the Techstream on.

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

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

6. Turn the engine switch on (IG) and turn the Techstream on.

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

8. Check the monitor item O2 Sensor is incomplete.

HINT
The test values for the test items RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1, LR DELAY B1S1, RL RES RATE B2S1, LR RES RATE B2S1, RL DELAY B2S1 and LR DELAY B2S1 do not exist in the Detail of O2 Sensor monitor at this time (the initial value of "0.000" is indicated in each test item).

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 a constant speed between 47 and 62 mph (75 and 100 km/h) for 10 minutes [B].

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

11. Check that the monitor item O2 Sensor becomes Complete.

HINT
Check the test values on the Techstream by entering the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / Details / RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1, LR DELAY B1S1, RL RES RATE B2S1, LR RES RATE B2S1, RL DELAY B2S1 and LR DELAY B2S1.

12. If the monitor item O2 Sensor does not become Complete (if the test 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. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

14. Read the pending DTC [C].

15. If a pending DTC is output, the system is malfunctioning.

HINT
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, P014E, P014F, P015A, P015B, P015C, P015D.

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 step [B] again.

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

20. Check the judgment result.

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

21. If the test 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
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream.

(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
(f) Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume.)
(g) Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.

HINT
- The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.





NOTICE:
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.





- Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.

- To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / All Data / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2; and then press the graph button on the Data List view.

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 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 running or stopped, 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 Freeze Frame Data.
- Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
- Bank 2 refers to the bank that does not include the No. 1 cylinder.
- 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 ANY OTHER DTCS OUTPUT (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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, P014E, P014F, P015A, P015B, P015C or P015D are output, troubleshoot those DTCs first.

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

2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

(a) Disconnect the E42 or E38 A/F sensor connector.





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

Standard resistance (Bank 1 sensor 1):





Standard resistance (Bank 2 sensor 1):





(c) Reconnect the A/F sensor connector.

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 E38 and E42 A/F sensor connector.

(b) Disconnect the E6 ECM connector.

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

Standard resistance (Check for short):





Standard resistance (Check for open):





(d) Reconnect the ECM connector.

(e) Reconnect the A/F sensor connector.

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

4. INSPECT AIR FUEL RATIO SENSOR

(a) Check that the proper air fuel ratio sensors are 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 the Confirmation Driving Pattern.

NEXT -- Continue to next step.

6. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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 the Confirmation Driving Pattern.

NEXT -- Continue to next step.

9. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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
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