SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P042000, P043000

DTC Code DTC Name
P042000 Catalyst System Efficiency Below Threshold Bank 1
P043000 Catalyst System Efficiency Below Threshold Bank 2

MONITOR DESCRIPTION

The ECM uses air fuel ratio sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency.

The first sensor, the air fuel ratio sensor (sensor 1), sends pre-catalyst information to the ECM. The second sensor, the air fuel ratio sensor (sensor 2), sends post-catalyst information to the ECM.

In order to detect any deterioration in the three-way catalytic converter, the ECM calculates the oxygen storage capacity of the three-way catalytic converter. This calculation is based on the output current of the air fuel ratio sensor (sensor 2) while performing active air fuel ratio control.

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 30 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the cycle of the waveform for the air fuel ratio sensor (sensor 2) is long, the oxygen storage capacity is great. There is a direct correlation between the air fuel ratio sensor (sensor 2) and the oxygen storage capacity of the three-way catalytic converter.

The ECM uses the oxygen storage capacity value to determine the state of the three-way catalytic converter. If any deterioration has occurred, the ECM will illuminate the MIL and store a DTC.

This system determines the deterioration of the entire catalyst system (including the front and rear catalysts), by using the oxygen storage capacity value of the front catalyst, that is more sensitive than the rear catalyst, as the representative value. Therefore, be sure to replace the front and rear catalysts together when catalyst replacement is necessary.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P042000 Catalyst System Efficiency Below Threshold Bank 1 The oxygen storage capacity value is less than the standard value under active air fuel ratio control (1 trip detection logic).

  • Gas leak from exhaust system

  • Air fuel ratio sensor (bank 1 sensor 1)

  • Air fuel ratio sensor (bank 1 sensor 2)

  • Converter assembly RH (TWC: Front catalyst)

  • Front exhaust pipe assembly (TWC: Rear catalyst)

 Comes on DTC stored SAE: P0420
P043000 Catalyst System Efficiency Below Threshold Bank 2 The oxygen storage capacity value is less than the standard value under active air fuel ratio control (1 trip detection logic).

  • Gas leak from exhaust system

  • Air fuel ratio sensor (bank 2 sensor 1)

  • Air fuel ratio sensor (bank 2 sensor 2)

  • Converter assembly LH (TWC: Front catalyst)

  • Front exhaust pipe assembly (TWC: Rear catalyst)

 Comes on DTC stored SAE: P0430

CATALYST LOCATION

B006GL7C01
*A for 2WD *B for AWD
*1 Converter Assembly RH (TWC: Front Catalyst) *2 Converter Assembly LH (TWC: Front Catalyst)
*3 Air Fuel Ratio Sensor (Bank 1 Sensor 1) *4 Air Fuel Ratio Sensor (Bank 2 Sensor 1)
*5 Air Fuel Ratio Sensor (Bank 1 Sensor 2) *6 Air Fuel Ratio Sensor (Bank 2 Sensor 2)
*7 Front Exhaust Pipe Assembly (TWC: Rear Catalyst) *8 Exhaust Tailpipe Assembly RH
*9 Exhaust Tailpipe Assembly LH - -

Note


  • If DTC P042000 is output, replace the converter assembly RH (*1) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary (Excluding air fuel ratio sensor (sensor 1) *3 and air fuel ratio sensor (sensor 2) *5).

  • If DTC P043000 is output, replace the converter assembly LH (*2) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary (Excluding air fuel ratio sensor (sensor 1) *4 and air fuel ratio sensor (sensor 2) *6).

MONITOR STRATEGY

Required Sensors/Components (Main)

Air fuel ratio sensor (sensor 1)

Air fuel ratio sensor (sensor 2)
Required Sensors/Components (Related)

Intake air temperature (mass air flow meter sub-assembly)

Mass air flow meter sub-assembly

Crankshaft position sensor

Engine coolant temperature sensor
Frequency of Operation Once per driving cycle

TYPICAL ENABLING CONDITIONS

Response rate during fuel cut from rich condition Completed
Battery voltage 11 V or higher
Intake air temperature (mass air flow meter sub-assembly) -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa(abs) [11 psi(abs)] or higher
Idling Off
Engine speed Less than 3200 rpm
Sub feedback control Executing
Air fuel ratio sensor (sensor 1) status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 140%
All of the following conditions are met 1, 2 and 3
1. Mass air flow 5 gm/sec or more, and less than 60 gm/sec
2. Front catalyst temperature (estimated) 540°C (1004°F) or higher, and less than 800°C (1472°F)
3. Rear catalyst temperature (estimated) 400°C (752°F) or higher, and less than 700°C (1292°F)

TYPICAL MALFUNCTION THRESHOLDS

Oxygen Storage Capacity (OSC) of catalyst (Normalized) Less than 1

CONFIRMATION DRIVING PATTERN

Tech Tips


  • It is necessary for the response of the air fuel ratio sensor (sensor 2) to be normal in order to confirm DTC P042000 and P043000. Therefore, perform the confirmation driving pattern for the air fuel ratio sensor (sensor 2) monitor before performing the confirmation driving pattern for the catalyst efficiency monitor.

  • Performing this confirmation driving pattern will activate the catalyst efficiency monitor. This is very useful for verifying the completion of a repair.

B006D6WE01

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

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

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

  6. Turn the engine switch on (IG).

  7. Turn the GTS on.

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

  9. Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [B].

    CAUTION:

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

    Tech Tips

    Drive the vehicle while keeping the engine load as constant as possible.

  10. With the shift state M, drive the vehicle at 60 km/h (37 mph), and then decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].

    CAUTION:

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

  11. Repeat step [C] 2 times or more in one driving cycle.

  12. Turn the engine switch off and wait for at least 30 seconds [D].

  13. Turn the engine switch on (IG).

  14. Turn the GTS on.

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

  16. Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [F].

    CAUTION:

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

    Tech Tips

    Drive the vehicle while keeping the engine load as constant as possible.

  17. Enter the following menus: Powertrain / Engine / Trouble Codes [G].

  18. Check if any DTCs are stored.

    Tech Tips

    If the monitor item does not change to Complete, and no DTCs are stored, perform the following procedure.

  19. Drive the vehicle at a speed between 75 and 100 km/h (47 and 62 mph) for 10 minutes or more [H].

    CAUTION:

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

    Tech Tips

    Drive the vehicle while keeping the engine load as constant as possible.

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

  21. Read the pending DTCs.

    Tech Tips


    • 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: P042000 or P043000.

  24. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    Tech Tips


    • If the judgment result is NORMAL, the system is normal.

    • If the judgment result is ABNORMAL, the system has a malfunction.

CAUTION / NOTICE / HINT

Tech Tips


  • If a malfunction cannot be found when troubleshooting DTC P042000 or P043000, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P017100 and P017400 (System Too Lean) and P017200 and P017500 (System Too Rich).

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

  • Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  • 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.

    DTC Suspected Area
    P042000 Bank 1
    P043000 Bank 2

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P042000 AND/OR P043000)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P042000 and/or P043000 is output A
      DTC P042000 and/or P043000 and other DTCs are output B

      Tech Tips

      If any DTCs other than P042000 and/or P043000 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

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

    6. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S1 and A/F (O2) Sensor Current B2S2.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Volume for A/F Sensor
      Data List Display
      A/F (O2) Sensor Current B1S1
      A/F (O2) Sensor Current B2S1
      A/F (O2) Sensor Current B1S2
      A/F (O2) Sensor Current B2S2

    7. Change the fuel injection volume using the GTS, and monitor the output current of the air fuel ratio sensor (sensor 1) (A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1) and air fuel ratio sensor (sensor 2) (A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2) displayed on the GTS.

      Tech Tips


      • The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.

      • The air fuel ratio sensor (sensor 1) is displayed as A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1, and the air fuel ratio sensor (sensor 2) is displayed as A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2 on the GTS.

      • The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.

      • If the sensor output current does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

      Standard

      GTS Display

      (Sensor)

      		 Injection Volume Status Current

      A/F (O2) Sensor Current B1S1

      A/F (O2) Sensor Current B2S1

      (Air fuel ratio (sensor 1))

      		 12.5% Rich Below -0.075 mA
      -12.5% Lean More than 0.037 mA

      A/F (O2) Sensor Current B1S2

      A/F (O2) Sensor Current B2S2

      (Air fuel ratio (sensor 2))

      		 12.5% Rich Below -0.86 mA
      -12.5% Lean More than 0.33 mA
      Result
      Status of A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1 Status of A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2 Actual air fuel ratio, air fuel ratio sensor (sensor 1) and air fuel ratio sensor (sensor 2) condition Main Suspected Trouble Area Proceed to
      Lean/Rich Lean/Rich Normal

      • Three-way catalytic converter

      • Gas leak from exhaust system

      		 A
      Lean Lean/Rich Air fuel ratio sensor (sensor 1) malfunction

      • Air fuel ratio sensor (sensor 1)

      		 B
      Rich Lean/Rich Air fuel ratio sensor (sensor 1) malfunction

      • Air fuel ratio sensor (sensor 1)
      Lean/Rich Lean Air fuel ratio sensor (sensor 2) malfunction

      • Air fuel ratio sensor (sensor 2)

      • Gas leak from exhaust system

      		 C
      Lean/Rich Rich Air fuel ratio sensor (sensor 2) malfunction

      • Air fuel ratio sensor (sensor 2)

      • Gas leak from exhaust system
      Lean Lean Actual air fuel ratio lean

      • Extremely lean actual air fuel ratio

      • Gas leak from exhaust system

      		 D
      Rich Rich Actual air fuel ratio rich

      • Extremely rich actual air fuel ratio

      • Gas leak from exhaust system

      • Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1) is consistently more than 0.037 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2) is consistently more than 0.33 mA.

      • Rich: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1) is consistently below -0.075 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2) is consistently below -0.86 mA.

      • Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output current of the air fuel ratio sensor (sensor 1) or air fuel ratio sensor (sensor 2) alternate correctly.

      Tech Tips

      Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1, A/F (O2) Sensor Current B2S1, A/F (O2) Sensor Current B1S2, A/F (O2) Sensor Current B2S2].

      Click here


    B

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) Click here

    C

    CHECK FOR EXHAUST GAS LEAK Click here

    D

    CHECK FOR EXHAUST GAS LEAK Click here

    A

  3. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks.

      OK
      No gas leaks in exhaust system.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 12 Click here

    NG

    GO TO STEP 9 Click here

  4. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)


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

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 10 Click here

  5. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks.

      OK
      No gas leaks in exhaust system.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 9 Click here

    OK

  6. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)


    1. Replace the air fuel ratio sensor (sensor 2).

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 10 Click here

  7. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks.

      OK
      No gas leaks in exhaust system.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM Click here

    OK

  8. CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO


    1. Check the cause of extremely rich or lean actual air fuel ratio, referring to the DTC P017100, P017200, P017400 and P017500 Inspection Procedure.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 10 Click here

  9. REPAIR OR REPLACE EXHAUST SYSTEM


    1. Repair or replace exhaust system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the exhaust system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.

    3. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P042000 and/or P043000 is output B

    A

    END

    B

  12. CHECK DTC OUTPUT (DTC P042000 AND/OR P04300)

    Note


    • IF DTC P042000 is output, replace the converter assembly RH (TWC: Front catalyst) and the front exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary.

    • If DTC P043000 is output, replace the converter assembly LH (TWC: Front catalyst) and the front exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary.

    Tech Tips

    Confirm the replacement parts, referring to the illustration in Catalyst Location.


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P042000 is output A
      DTC P043000 is output B
      DTC P042000 and P043000 are output C

    A

    REPLACE CONVERTER ASSEMBLY RH (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST) Click here

    B

    REPLACE CONVERTER ASSEMBLY LH (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST) Click here

    C

    REPLACE CONVERTER ASSEMBLY RH AND LH (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST) Click here