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                                                                                                                                    DI-55
                                                 DIAGNOSTICS       -    ENGINE
                                                                                                                                        DI6V5-04




    DTC                P0135               Heated Oxygen Sensor Heater Circuit
                                           Malfunction (Bank1 Sensor1)


    DTC                P0141               Heated Oxygen Sensor Heated Circuit
                                           Malfunction (Bank1 Sensor2)

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
                 When the heater operates, heater current exceeds 2 A
                 (2 trip detection logic)                                   S Open or short in heater circuit of heated oxygen sensor
     P0135
                                                                            S H t d oxygen sensor heater
                                                                              Heated                 h t
     P0141       Heater current of 0.2 A or less when the heater operates
                                                                            S ECM
                 (2 trip detection logic)

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

WIRING DIAGRAM
Refer to DTC P0125 on page DI-43 for the WIRING DIAGRAM.

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.




 2002 ECHO (RM884U)

                                                                             Author :                    Date :                         225
DI-56
                                    DIAGNOSTICS   -   ENGINE



   1     Check voltage between terminals HT, HT2 of ECM connectors and body ground.

        ON
                                          PREPARATION:
                      HT                  (a) Remove the connector cover from the ECM.
                                          (b) Turn the ignition switch ON.
                                          CHECK:
                                          Measure voltage between terminals HT, HT2 of ECM connec-
                                          tors and body ground.
                     (+)   (-)            HINT:
                                           S    Connect terminal HT to bank 1 sensor 1.
        HT2                                S    Connect terminal HT2 to bank 1 sensor 2.
                                 A09037

                                          OK:
                                                Voltage: 9 - 14 V

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


  NG



   2     Check resistance of heated oxygen sensor heater (See page SF-60 ).


                                            NG        Replace heated oxygen sensor.


  OK



  Check and repair harness or connector between EFI main relay (Marking: EFI), heated oxygen
  sensor and ECM (See page IN-29 ).




2002 ECHO (RM884U)

                                                               Author :       Date :             226

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