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DI-52
                                                    DIAGNOSTICS        -   ENGINE
                                                                                                                                    DI6V4-04




    DTC                 P0133                Oxygen Sensor Circuit Slow
                                             Responce (Bank 1 Sensor 1)

CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI-43 .
   DTC No.                       DTC Detecting Condition                                                   Trouble Area
                                                                                  S Open or short in heated oxygen sensor circuit
              Response time for the oxygen sensor's voltage output to-            S Heated oxygen sensor
              change from rich to lean, or from lean to rich, is 1 sec. or more   S Air induction system
   P0133
              during idling after the engine is warmed up                         S Fuel pressure
              (2 trip detection logic)                                            S Injector
                                                                                  S ECM

HINT:
Sensor 1 refers to the sensor closer to the engine body.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scantool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.

   1       Are there any other codes (besides DTC P0133) being output?


                                                             YES           Go to relevant DTC chart (See page DI-14 ).


   NO




 2002 ECHO (RM884U)

                                                                                     Author :                    Date :               222
                                                                                                 DI-53
                                     DIAGNOSTICS   -   ENGINE



   2    Check the output voltage of oxygen sensor during idling.

PREPARATION:
Warm up the oxygen sensor the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Use the OBD II scan tool or TOYOTA hand-held tester read the output voltage of the oxygen sensor during
idling.
OK:
       Oxygen sensor output voltage:
       Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the Following table).




                                                                                                  P18349




                                             OK        Perform confirmation driving pattern
                                                       (See page DI-48 ).


  NG



   3    Check for open and short in harness and connector between ECM and oxygen
        sensor (bank 1 sensor 1) (See page IN-19 ).


                                             NG        Repair or replace harness or connector.


  OK



   4    Check air induction system (See page SF-1 ).


                                             NG        Repair or replace induction system.


  OK




2002 ECHO (RM884U)

                                                             Author :          Date :            223
DI-54
                                  DIAGNOSTICS   -   ENGINE



   5    Check fuel pressure (See page SF-6 ).


                                         NG         Check and repair fuel pump, fuel pipe line and
                                                    filter (See page SF-1 ).


  OK



   6    Check injector injection (See page SF-21 ).


                                         NG         Replace injector.


  OK



  Replace oxygen sensor (bank 1 sensor 1).



   7    Perform confirmation driving pattern (See page DI-48 ).


   Go



   8    Are there DTC P0133 being output again?


                                        YES         Check for intermittent problems
                                                    (See page DI-3 ).


  NO



  Check and replace ECM (See page IN-29 ).




2002 ECHO (RM884U)

                                                             Author :        Date :           224

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