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cip0136


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                                                                                                                                      DI-57
                                                    DIAGNOSTICS        -    ENGINE
                                                                                                                                      DI6V6-04




    DTC                   P0136               Oxygen Sensor Circuit Malfunction
                                              (Bank 1 Sensor 2)

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
                Voltage output of the heated oxygen sensor remains at 0.40 V
                or more, or 0.50 V or less when the vehicle is driven at 40 km/h    S Open or short in heated oxygen sensor circuit
   P0136
                (25 mph) or more after the engine is warmed up.                     S Heated oxygen sensor
                (2 trip detection logic).

HINT:
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI-43 for the WIR-
ING DIAGRAM.

CONFIRMATION DRIVING PATTERN


                                               Once                Twice                            11 times
                                               40 sec.             40 sec.                          40 sec.
        Vehicle speed
                                               or more             or more                          or more
               30 km/h
               (19 mph)                          (d)                  (d)                              (d)

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

                             60 sec.                     10 sec.             10 sec.                           10 sec.
                (a) (b)      or more


                                                                                                                                       A09300

(a) Connect the hand-held tester to the DLC3.
(b) Switch the hand-held tester from the Normal Mode to the Check (Test) Mode (See page DI-3 ).
(c) Start the engine and let the engine idle for 60 seconds or more.
(d) Drive the vehicle at 30 km/h (18 mph) or more for 40 seconds or more.
(e) Let the engine idle for 10 seconds or more.
(f)    Preform steps (d) to (e) 11 times.
HINT:
If a malfunction exists, the CHK ENG (MIL) will be indicated on the multi information display during step (f).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (c) to (f),
then perform steps (c) to (f) again.



 2002 ECHO (RM884U)

                                                                                         Author :                  Date :             227
DI-58
                                        DIAGNOSTICS   -   ENGINE

INSPECTION PROCEDURE
HINT:
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 P0136) being output?


                                               YES        Go to relevant DTC chart.


   NO



   2     Check for open and short in harness and connector between ECM and oxygen
         sensor (See page IN-29 ).


                                                NG        Repair or replace harness or connector.


   OK



   3     Check output voltage of oxygen sensor.

PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Warm up the engine to normal operating temp.
CHECK:
Read voltage output of oxygen sensor when engine suddenly raced.
HINT:
Perform quick racing to 4,000 rpm 3 min. using accelerator pedal.
OK:
      Oxygen sensor output voltage: Alternates from 0.40 V or less to 0.50 V or more.

                                                OK         Check that each connector is properly con-
                                                          nected.


   NG



  Replace oxygen sensor.


 2002 ECHO (RM884U)

                                                                   Author :          Date :              228



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