Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0136

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DI-48
                                                   DIAGNOSTICS        -   ENGINE
                                                                                                                        DI223-03




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

CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-42 .
   DTC No.                       DTC Detecting Condition                                                 Trouble Area
               Voltage output of heated oxygen sensor (bank 1 sensor 2)
              remains at 0.4 V or more or 0.6 V or less when vehicle is driv-
   P0136                                                                        S Heated oxygen sensor
              en at 50 km/h (31 mph) or more after engine is warmed up
              (2 trip detection logic)

HINT:
Bank 1 refers to the bank that includes cylinder No.1. Sensor 2 refers to the sensor farther away from the
engine body.

WIRING DIAGRAM
Refer to DTC P0125 on page DI-42 .

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 heated
           oxygen sensor (See page IN-31 ).


                                                             NG           Repair or replace harness or connector.


   OK




 2001 SIENNA (RM787U)

                                                                                   Author :                   Date :      202
                                                                                             DI-49
                                    DIAGNOSTICS   -   ENGINE



   3    Check output voltage of heated oxygen sensor (bank 1 sensor 2).

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 heated oxygen sensor (bank 1 sensor 2) when engine suddenly raced.
HINT:
Perform quick racing to 4,000 rpm 3 min. using accelerator pedal.
OK:
      Heated oxygen sensor output voltage: Alternates from 0.4 V or less to 0.6 V or more.

                                           OK         Check that each connector is properly con-
                                                      nected.


  NG



 Replace heated oxygen sensor (bank 1 sen-
 sor 2).




2001 SIENNA (RM787U)

                                                           Author :         Date :           203

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