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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Control System - Diagnostic Codes (05 Of 10)) >> SFI SYSTEM (for Gasoline Model) >> DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [10/2022 - 08/2023] >> Procedure

DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [10/2022 - 08/2023]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420-00) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      P0420-00 and other DTCs are output A
      P0420-00 is output B

      HINT: 

      If any DTCs other than P0420-00 are output, troubleshoot those DTCs first.

    Result: 

    A 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 08/2023] 

    Result: 

    B 

    See step  2

  2. READ FREEZE FRAME DATA (LONG FT B1S2) 
    1. Using the GTS, read the value displayed in the Freeze Frame Data.

      Powertrain > Engine > DTC(P0420-00) > Freeze Frame Data 

      Tester Display
      Long FT B1S2

      Result

      GTS Display Result Proceed to
      Long FT B1S2 Less than 1.0% A
      1.0% or higher B

    Result: 

    B 

    See step  77

    Result: 

    A 

    See step  3

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

    Pre-procedure1

    • Start the engine and warm it up until the engine coolant temperature is 80°C (176°F) or higher.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    • Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.
    • 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) and air fuel ratio sensor (sensor 2) (A/F (O2) Sensor Current B1S2) displayed on the GTS.

      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 B1S2

      HINT: 

      • 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, and the air fuel ratio sensor (sensor 2) is displayed as A/F (O2) Sensor Current B1S2 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
      (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
      (Air fuel ratio (sensor 2))      		 12.5% Rich Below -0.86 mA
      -12.5% Lean More than 0.33 mA

      Result

      Status A/F (O2) Sensor Current B1S1 Status A/F (O2) Sensor Current B1S2 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
      1. 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) is consistently more than 0.037 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently more than 0.33 mA.
      2. 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) is consistently below -0.075 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently below -0.86 mA.
      3. 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.

      HINT: 

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

      Refer to DATA LIST / ACTIVE TEST [10/2022 - 10/2024]

    Post-procedure1

    • None.

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  6

    Result: 

    D 

    See step  8

    Result: 

    A 

    See step  4

  4. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  76

    Result: 

    NG 

    See step  73

  5. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  6. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  73

    Result: 

    OK 

    See step  7

  7. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  8. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  73

    Result: 

    OK 

    See step  9

  9. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION MODE) 

    Refer to PROCEDURE - Step 2

    Result

    Item Proceed to
    Port Direct
    OK OK A
    OK NG B
    NG OK C
    NG NG D

    Result: 

    B 

    See step  13

    Result: 

    C 

    See step  26

    Result: 

    D 

    See step  29

    Result: 

    A 

    See step  10

  10. CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST 

    Refer to PROCEDURE - Step 3

    Result

    Result Proceed to
    YES A
    NO B

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  11

  11. DTC CAUSED BY RUNNING OUT OF FUEL 
    1. Dtc caused by running out of fuel.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  12. CHECK FOR INTERMITTENT PROBLEMS 

    HINT: 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  13. READ VALUE USING GTS (FUEL PRESSURE (HIGH)) 

    Refer to PROCEDURE - Step 4

    Result

    Result Proceed to
    The value of Fuel Pressure (High) is between 2000 and 32000 kPag A
    None of the above conditions are met B

    Result: 

    B 

    See step  20

    Result: 

    A 

    See step  14

  14. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION MODE (DIRECT)) 

    Refer to PROCEDURE - Step 5

    Result

    Item Proceed to
    Injection Mode High Pressure Fuel Pump Duty Ratio (D4) Total of Short FT B1S1 and Long FT B1S1
    Direct 10% to 50% - A
    50% or higher -20% or less B
    10% or less +20% or higher
    50% or higher +20% or higher C
    10% or less -20% or less D

    Result: 

    B 

    See step  18

    Result: 

    C 

    See step  21

    Result: 

    D 

    See step  19

    Result: 

    A 

    See step  15

  15. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION MODE (DIRECT)) 

    Refer to PROCEDURE - Step 6

    Result

    Item Proceed to
    Injection Mode High Pressure Fuel Pump Duty Ratio (D4) Total of Short FT B1S1 and Long FT B1S1
    Direct 10 to 50% -25% or less A
    10 to 50% +25% or higher
    10 to 50% -25 to +25% B

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  16

  16. REPLACE DIRECT FUEL INJECTOR ASSEMBLY 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  17. CHECK FOR INTERMITTENT PROBLEMS 

    HINT: 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  18. REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  19. REPLACE ECM 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  20. CHECK MISFIRE COUNT OF DIRECT INJECTION 

    Refer to PROCEDURE - Step 7

    Result

    Injection Mode Misfire Count Proceed to
    Direct No misfire counts, or misfire counts occur randomly in all cylinders A
    Misfire counts occur in particular cylinder B

    Result: 

    B 

    See step  24

    Result: 

    A 

    See step  21

  21. REPLACE FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) 

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  22

  22. CLEAR DTC 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  23

  23. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      P0420-00 is output B

    Post-procedure1

    • None.

    Result: 

    A 

    See step  74

    Result: 

    B 

    See step  25

  24. REPLACE DIRECT FUEL INJECTOR ASSEMBLY 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  25. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  26. INSPECT PORT FUEL INJECTOR ASSEMBLY 

    Refer to PROCEDURE - Step 11

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  28

    Result: 

    OK 

    See step  27

  27. REPLACE ECM 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  28. REPLACE PORT FUEL INJECTOR ASSEMBLY 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  29. CHECK PCV VALVE AND HOSE CONNECTIONS 

    Refer to PROCEDURE - Step 12

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  72

    Result: 

    OK 

    See step  30

  30. CHECK INTAKE SYSTEM 

    Refer to PROCEDURE - Step 13

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  71

    Result: 

    OK 

    See step  31

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

    Refer to PROCEDURE - Step 14

    Result

    Status A/F (O2) Sensor Current B1S1 Status A/F (O2) Sensor Current B1S2 Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition Suspected Trouble Area Proceed to
    Lean/Rich Lean/Rich Normal - A
    Lean Lean Actual air fuel ratio lean
    • PCV valve and hose
    • PCV hose connections
    • Gas leak from exhaust system
    • Intake system
    • Fuel pressure
    • Mass air flow meter sub-assembly
    • Engine coolant temperature sensor
    Rich Rich Actual air fuel ratio rich
    • Gas leak from exhaust system
    • Ignition system
    • Fuel pressure
    • Mass air flow meter sub-assembly
    • Engine coolant temperature sensor
    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)

    Result: 

    B 

    See step  44

    Result: 

    A 

    See step  32

  32. READ VALUE USING GTS (COOLANT TEMPERATURE) 

    Refer to PROCEDURE - Step 15

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  43

    Result: 

    OK 

    See step  33

  33. READ VALUE USING GTS (MASS AIR FLOW SENSOR) 

    Refer to PROCEDURE - Step 16

    Result

    Result Proceed to
    The value of Mass Air Flow Sensor is between 5.0 and 15 gm/sec A
    None of the above conditions are met B

    Result: 

    B 

    See step  52

    Result: 

    A 

    See step  34

  34. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE) 

    Refer to PROCEDURE - Step 17

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  40

    Result: 

    OK 

    See step  35

  35. CHECK FOR EXHAUST GAS LEAK 

    Refer to PROCEDURE - Step 18

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  39

    Result: 

    OK 

    See step  36

  36. INSPECT SPARK PLUG 

    Refer to PROCEDURE - Step 19

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  38

    Result: 

    OK 

    See step  37

  37. CHECK FOR SPARK (SPARK TEST) 

    Refer to PROCEDURE - Step 20

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  52

  38. REPLACE SPARK PLUG 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  39. REPAIR OR REPLACE EXHAUST SYSTEM 
    1. Repair or replace exhaust system.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  40. CHECK FUEL LINE 

    Refer to PROCEDURE - Step 21

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  42

    Result: 

    OK 

    See step  41

  41. GO TO FUEL PUMP CONTROL CIRCUIT 

    HINT: 

    Refer to Fuel Pump Control Circuit [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  42. REPAIR OR REPLACE FUEL SYSTEM 
    1. Repair or replace fuel system.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  43. REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  44. INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE) 

    Refer to PROCEDURE - Step 22

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  70

    Result: 

    OK 

    See step  45

  45. CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR (SENSOR 1)) 

    Refer to PROCEDURE - Step 23

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  55

    Result: 

    OK 

    See step  46

  46. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 1) - ECM) 

    Refer to PROCEDURE - Step 24

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  50

    Result: 

    OK 

    See step  47

  47. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) 

    Refer to PROCEDURE - Step 25

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  48

  48. CLEAR DTC 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  49

  49. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      P0420-00 is output B

    Post-procedure1

    • None.

    Result: 

    A 

    See step  74

    Result: 

    B 

    See step  51

  50. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  51. READ VALUE USING GTS (MASS AIR FLOW SENSOR) 

    Refer to PROCEDURE - Step 28

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  52

  52. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) 

    Refer to PROCEDURE - Step 29

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  53

  53. CLEAR DTC 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  54

  54. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      P0420-00 is output B

    Post-procedure1

    • None.

    Result: 

    A 

    See step  74

    Result: 

    B 

    See step  60

  55. INSPECT EFI-MAIN NO. 3 RELAY 

    Refer to PROCEDURE - Step 32

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  69

    Result: 

    OK 

    See step  56

  56. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 3 RELAY) 

    Refer to PROCEDURE - Step 33

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  68

    Result: 

    OK 

    See step  57

  57. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND) 

    Refer to PROCEDURE - Step 34

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  67

    Result: 

    OK 

    See step  58

  58. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - AIR FUEL RATIO SENSOR (SENSOR 1)) 

    Refer to PROCEDURE - Step 35

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  64

    Result: 

    OK 

    See step  59

  59. REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY) 
    1. Repair or replace harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  60. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 

    Refer to PROCEDURE - Step 36

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  65

    Result: 

    OK 

    See step  61

  61. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 37

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  62

  62. CLEAR DTC 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  63

  63. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      P0420-00 is output B

    Post-procedure1

    • None.

    Result: 

    A 

    See step  74

    Result: 

    B 

    See step  66

  64. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  65. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  66. REPLACE ECM 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  67. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  68. REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 3 RELAY) 
    1. Repair or replace harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  69. REPLACE EFI-MAIN NO. 3 RELAY 
    1. Replace EFI-MAIN NO. 3 relay.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  70. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  71. REPAIR OR REPLACE INTAKE SYSTEM 
    1. Repair or replace intake system.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  72. REPAIR OR REPLACE PCV VALVE OR HOSE 
    1. Repair or replace PCV valve or hose.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  74

  73. REPAIR OR REPLACE EXHAUST SYSTEM 

    HINT: 

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

    Refer to INITIALIZATION [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  74

  74. CLEAR DTC 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  75

  75. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      P0420-00 is output B

    Post-procedure1

    • None.

    Result: 

    A 

    END 

    Result: 

    B 

    See step  76

  76. REPLACE CONVERTER WITH CATALYST ASSEMBLY (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST) 
    NOTE:

    When replacing the converter with catalyst assembly and the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor (sensor 1) and the air fuel ratio sensor (sensor 2).

    HINT: 

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

    1. Replace the converter with catalyst assembly (TWC: Front catalyst).

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    2. Replace the front exhaust pipe assembly (TWC: Rear catalyst).

      HINT: 

      Refer to REMOVAL [10/2022 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  77. CHECK FOR EXHAUST GAS LEAK 

    OK

    No gas leaks in exhaust system.

    HINT: 

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

    Refer to INITIALIZATION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE EXHAUST SYSTEM 

    Result: 

    OK 

    See step  78

  78. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 

    HINT: 

    Refer to REMOVAL [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  79

  79. CLEAR DTC 

    Pre-procedure1

    • None.
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  80

  80. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Check for DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      DTCs are not output.

      Result

      Proceed to
      NEXT

    Post-procedure1

    • None.

    Result: 

    NEXT 

    END 

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