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                                                 DIAGNOSTICS       -    ENGINE

    DTC               P0130               Oxygen Sensor Circuit Malfunction
                                          (Bank 1 Sensor 1)

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
                                                                             S Heated oxygen sensor
            Voltage output of oxygen sensor remains at 0.4 V or more, or
                                                                             S Air induction system
   P0130    0.55 V or less, during idling after the engine is warmed up (2
                                                                             S Fuel pressure
            trip detection logic)
                                                                             S Injector
                                                                             S ECM

Sensor 1 refers to the sensor closer to the engine body.
The oxygen sensor's output voltage and the short-term fuel trim value can be read using the OBD II scan
tool or TOYOTA hand-held tester.

Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI-43 for the WIR-

2002 ECHO (RM884U)

                                                                                 Author :                   Date :               218
                                         DIAGNOSTICS      -     ENGINE


       Vehicle speed                  20 sec.           20 sec.            20 sec.
                                      or more           or more            or more
           40 km/h
           (24 mph)                    (d)                (d)                 (d)

                         Idling (c)               (e)                (e)              (f)
         IG SW OFF

              (a) (b)    100 sec.               20 sec.            20 sec.
                                                                                     30 sec.
                         or more                or more            or more


(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Switch the TOYOTA hand-held tester from normal mode to check mode (See page DI-3 ).
(c) Start the engine and let the engine idle for 100 sec. or more.
(d) Drive the vehicle at 40 km/h (24 mph) or more for 20 sec. or more.
(e) Let the engine idle for 20 sec. or more.
(f)    Let the engine idle for 30 sec.
If a malfunction exists, the MIL will light up during step (f).
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a TOYOTA hand-held tester, turn the ignition switch OFF after performing steps
(c) to (f), then perform steps (c) to (f) again.
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. 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 P0130) being output?

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


 2002 ECHO (RM884U)

                                                                      Author :                 Date :     219
                                      DIAGNOSTICS   -   ENGINE

   2    Check the output voltage of oxygen sensor during idling.

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


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


   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.


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

                                             NG         Repair or replace induction system.


2002 ECHO (RM884U)

                                                                 Author :        Date :           220
                                 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 ).


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

                                        NG         Replace injector.


 Replace oxygen sensor (bank 1 sensor 1).

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


  8     Are there DTC P0130 being output again?

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


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

2002 ECHO (RM884U)

                                                         Author :          Date :              221

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