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Home >> Toyota >> 2006 >> Corolla CE, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) (2ZZ-GE) - Diagnostics) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Inspection Procedure >> OBD II scan tool (excluding the hand-held tester):

OBD II scan tool (excluding the hand-held tester):

WARNING: This page is about a different variant/trim than selected.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420) 
    1. Connect an OBD II scan tool to the DLC3.
    2. Turn the ignition switch to ON and turn the scan tool ON.

      Result: 

      DTC OUTPUT RESULT

      Display (DTC Output) Proceed To
      P0420 A
      P0420 and other DTCs B

      HINT:

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

    1. B: GO TO  DIAGNOSTIC TROUBLE CODE CHART  
    2. A: GO TO NEXT STEP 
  2. CHECK FOR EXHAUST GAS LEAKS 

    OK: No gas leakage 

    1. NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT 
    2. OK: GO TO NEXT STEP 
  3. INSPECT HEATED OXYGEN SENSOR (BANK 1 SENSOR 1) (See  DTC P0130 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)  ) 
    1. NG: REPLACE HEATED OXYGEN SENSOR (SENSOR 1) 
    2. OK: GO TO NEXT STEP 
  4. INSPECT HEATED OXYGEN SENSOR (BANK 1 SENSOR 2) (See  DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2),DTC P0138 HEATED OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)  ) 
    1. NG: REPLACE HEATED OXYGEN SENSOR (SENSOR 2) 
    2. OK: GO TO NEXT STEP 

      REPLACE EXHAUST PIPE ASSY FRONT (FRONT PIPE) 

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