SFI SYSTEM, Diagnostic DTC:P2195, P2196, P2197, P2198

INSPECTION PROCEDURE

• The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using an intelligent tester.

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  1. Connect the intelligent tester to the DLC3.

  2. Start the engine and turn the tester on.

  3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.

  4. Select the following menu items on the tester: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.

  5. Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the Right or Left button to change the fuel injection volume).

  6. Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2) displayed on the tester.

     Tip:
     

     • 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.

     Standard voltage
     Tester Display (Sensor) Injection Volume Status Voltage AFS B1S1 or AFS B2S1 (Air fuel ratio) +25% Rich Less than 3.0 AFS B1S1 or AFS B2S1 (Air fuel ratio) -12.5% Lean More than 3.35 O2S B1S2 or O2S B2S2 (Heated oxygen) +25% Rich More than 0.55 O2S B1S2 or O2S B2S2 (Heated oxygen) -12.5% Lean Less than 0.4

     Note:

     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.

     Case	Air Fuel Ratio Sensor (Sensor 1) Output Voltage	Heated Oxygen Sensor (Sensor 2) Output Voltage	Main Suspected Trouble Area
     1			-
     2			Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit
     3			Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit
     4			Fuel pressure Gas leakage from exhaust system (Air fuel ratio extremely lean or rich)

• 
  

  • 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.

  • The following air fuel ratio control procedure enables the technician to check and graph the voltage output of both the heated oxygen sensors. To display the graph, select the following menu items on the tester: View / Line Graph.

    Tip:
    

    • Read freeze frame data using the intelligent tester. 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.

    • 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.

PROCEDURE

1. Click here

   CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195, P2196, P2197 OR P2198)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch on (IG).

   3. Turn the tester on.

   4. Select the following menu items: Powertrain / Engine and ECT / DTC.

   5. Read the DTCs.

      Result
      Display (DTC Output) Proceed to P2195, P2196, P2197 or P2198 A P2195, P2196, P2197 or P2198 and other DTCs B

      Tip:

      If any DTCs other than P2195, P2196, P2197 or P2198 are output, troubleshoot those DTCs first.

   
   
   • AClick here
   • BClick here
2. Click here

   READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF AIR FUEL RATIO SENSOR)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Start the engine.

   3. Turn the tester on.

   4. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.

   5. Select the following menu items on the tester: Powertrain / Engine and ECT / Data List / A/F Control System / AFS B1S1 or AFS B2S1 and Engine Speed.

   6. Check the air fuel ratio sensor voltage 3 times, when the engine is in each of the following conditions:

      
      

      1. While idling (check for at least 30 seconds) (Step (1))

      2. At an engine speed of approximately 2500 rpm (without any sudden changes in engine speed) (Step (2))

      3. 

         Raise the engine speed to 4000 rpm and then quickly release the accelerator pedal so that the throttle valve is fully closed (Step (3)).

         Standard voltage
         Condition Air Fuel Ratio Sensor Voltage Variation Reference Steps (1) and (2) Changes at approximately 3.3 V Between 3.1 V and 3.5 V Step (3) Increases to 3.8 V or more This occurs during engine deceleration (when fuel-cut performed)

         Tip:

         For more information, see the diagrams below.

         Tip:
         

         • If the output voltage of the air fuel ratio sensor remains at approximately 3.3 V (see Malfunction Condition diagram) under any conditions, including those described on the previous page, the air fuel ratio sensor may have an open circuit. (This will also happen if the air fuel ratio sensor heater has an open circuit.)

         • If the output voltage of the air fuel ratio sensor remains at either approximately 3.8 V or more, or 2.8 V or less (see Malfunction Condition diagram) under any conditions, including those described on the previous page, the air fuel ratio sensor may have a short circuit.

         • The ECM stops fuel injection (fuel cut) during engine deceleration. This causes a lean condition and results in a momentary increase in the air fuel ratio sensor output voltage.

         • The ECM must establish a closed throttle valve position learning value to perform fuel cut. If the battery terminal has been reconnected, the vehicle must be driven over 16 km/h (10 mph) to allow the ECM to learn the closed throttle valve position.

         • When the vehicle is driven:

           The output voltage of the air fuel ratio sensor may be below 2.8 V during fuel enrichment. For the vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to overtake another vehicle. The air fuel ratio sensor is functioning normally.

         • The air fuel ratio sensor is a current output element; therefore, the current is converted into a voltage inside the ECM. Measuring the voltage at the connectors of the air fuel ratio sensor or ECM will show a constant voltage result.

   
   
   • OKClick here
   • NGClick here
3. Click here

   PERFORM CONFIRMATION DRIVING PATTERN

   
   
   • NEXTClick here
4. Click here

   CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch on (IG) and turn the tester on.

   3. Read the DTCs using the intelligent tester.

   4. Select the following menu items: Powertrain / Engine and ECT / DTC.

      Result
      Display (DTC Output) Proceed to No output A P2195, P2196, P2197 or P2198 (air fuel ratio sensor pending DTCs) B

   
   
   • AClick here
   • BClick here
5. Click here

   REPLACE AIR FUEL RATIO SENSOR

   
   

   1. Replace the air fuel ratio sensor (Click here).

   
   
   • NEXTClick here
6. Click here

   PERFORM CONFIRMATION DRIVING PATTERN

   
   
   • NEXTClick here
7. Click here

   CHECK WHETHER DTC OUTPUT RECURS

   
   

   1. Read the DTCs using the intelligent tester.

   2. Select the following menu items: Powertrain / Engine and ECT / DTC.

      Result
      Display (DTC Output) Proceed to No output A P2195, P2196, P2197 or P2198 B

   
   
   • AClick here
   • BClick here
8. Click here

   INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

   
   
   1. 

      Disconnect the air fuel ratio sensor connector.

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

      Standard resistance
      Bank 1
      Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω 1 (HA1A) - 4 (A1A-) Always 10 kΩ or higher
      Bank 2
      Tester Connection Condition Specified Condition 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω 1 (HA2A) - 4 (A2A-) Always 10 kΩ or higher

   3. Reconnect the air fuel ratio sensor connector.

   
   
   • OKClick here
   • NGClick here
9. Click here

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

   
   
   1. 

      Disconnect the air fuel ratio sensor connector.

   2. Disconnect the ECM connector.

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

      Standard resistance (Check for open)
      Bank 1
      Tester Connection Condition Specified Condition B20-1 (HA1A) - B2-2 (HA1A) Always Below 1 Ω B20-3 (A1A+) - B2-22 (A1A+) Always Below 1 Ω B20-4 (A1A-) - B2-30 (A1A-) Always Below 1 Ω
      Bank 2
      Tester Connection Condition Specified Condition B19-1 (HA2A) - B2-1 (HA2A) Always Below 1 Ω B19-3 (A2A+) - B2-23 (A2A+) Always Below 1 Ω B19-4 (A2A-) - B2-31 (A2A-) Always Below 1 Ω

      Standard resistance (Check for short)
      Bank 1
      Tester Connection Condition Specified Condition B20-1 (HA1A) or B2-2 (HA1A) - Body ground Always 10 kΩ or higher B20-3 (A1A+) or B2-22 (A1A+) - Body ground Always 10 kΩ or higher B20-4 (A1A-) or B2-30 (A1A-) - Body ground Always 10 kΩ or higher
      Bank 2
      Tester Connection Condition Specified Condition B19-1 (HA2A) or B2-1 (HA2A) - Body ground Always 10 kΩ or higher B19-3 (A2A+) or B2-23 (A2A+) - Body ground Always 10 kΩ or higher B19-4 (A2A-) or B2-31 (A2A-) - Body ground Always 10 kΩ or higher

   4. Reconnect the ECM connector.

   5. Reconnect the air fuel ratio sensor connector.

   
   
   • OKClick here
   • NGClick here
10. Click here

    CHECK AIR INDUCTION SYSTEM

    
    

    1. Check the air induction system for vacuum leakage.

       OK
       No leakage from air induction system.

    
    
    • OKClick here
    • NGClick here
11. Click here

    CHECK FUEL PRESSURE

    
    

    1. Check the fuel pressure (Click here).

    
    
    • OKClick here
    • NGClick here
12. Click here

    REPLACE AIR FUEL RATIO SENSOR

    
    

    1. Replace the air fuel ratio sensor (Click here).

    
    
    • NEXTClick here
13. Click here

    PERFORM CONFIRMATION DRIVING PATTERN

    
    
    • NEXTClick here
14. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

    
    

    1. Read the DTCs using the intelligent tester.

    2. Select the following menu items: Powertrain / Engine and ECT / DTC.

       Result
       Display (DTC Output) Proceed to No output A P2195, P2196, P2197 or P2198 B

    
    
    • AClick here
    • BClick here
15. Click here

    CONFIRM WHETHER VEHICLE HAS RUN OUT OF FUEL IN PAST

    
    

    1. Has the vehicle run out of fuel in the past?

    
    
    • YESClick here
    • NOClick here
16. Click here

    GO TO DTC CHARTClick here

17. Click here

    END

18. Click here

    REPLACE ECMClick here

19. Click here

    REPLACE AIR FUEL RATIO SENSORClick here

20. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

21. Click here

    REPAIR OR REPLACE AIR INDUCTION SYSTEM

22. Click here

    REPAIR OR REPLACE FUEL SYSTEM

23. Click here

    CHECK INTERMITTENT PROBLEMS

24. Click here

    DTC CAUSED BY RUNNING OUT OF FUEL