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DI-48
                                                  DIAGNOSTICS        -   ENGINE (5VZ-FE)
                                                                                                                                  DI0S1-1 1




    DTC                P0136                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 remains at 0.45
              *1V/0.4 V*2 or more or 0.60 V*1/0.5 V*2 or less when vehicle is

              driven at 50 km/h (31 mph) or more after engine is warmed up      S Open or short in Heated oxygen sensor circuit
   P0136
              (2 trip detection logic)                                          S Heated oxygen sensor
              *1: California Spec.
              *2: Except California Spec.

HINT:
Sensor 2 refer 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 was warmed up or not, the air-fuel ratio was 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 (See page IN-28 ).


   NO



   2       Check for open and short in harness and connector between ECM and heated
           oxygen sensor (See page IN-28 ).


                                                            NG           Repair or replace harness or connector.


   OK




2002 4RUNNER (RM887U)

                                                                                   Author :                    Date :               224
                                                                                             DI-49
                                     DIAGNOSTICS   -   ENGINE (5VZ-FE)



   3    Check output voltage of heated 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 temperature.
CHECK:
Read the voltage output of the heated oxygen sensor when the engine is suddenly raced.
HINT:
Perform quick racing to 4,000 rpm 3 min. using the accelerator pedal.
OK:
      Heated oxygen sensor output voltage:
      Alternates from 0.45 V*1/0.4 V*2 or less to 0.60 V*1/0.5 V*2 or more.
      *1: California Spec.
      *2: Except California Spec.

                                            OK         Check that each connector is properly con-
                                                       nected.


  NG



 Replace heated oxygen sensor.




2002 4RUNNER (RM887U)

                                                             Author :        Date :          225

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